rifle twist rate chart

Most of us mere mortals dont worry about spin drift, but its a real effect that long-range shooters must consider. Mag. The 18 twist rate gives a bit more accuracy at 600 yards and further with heavier bullets than 500 gr. But the length of the bullet does change as the mass increases. The rate of spin is important. In .30 caliber, a 1:10 twist will stabilize a wide range of bullet weights. It really only shows up at very long distances. The higher the second number is the slower the twist rate is. Heres how the whole thing looks when put together. As expected, the 55-grain bullet grouped best. Calibers and Twist Rates. For this article, I shot a 50-yard test group with the 55-grain V-Max, all shots touching. twist is 1:10.. At the extremes, one spin has never fit all, but today there are more situations where standard rifling twists may not suit your needs. This is a general information calculator and there may be additional parameters that can . In the United States, since at least 1962, Remington has been the 7mm champ and has used an odd 1:9.25 twist for its several 7mm cartridges. Rifling is the helical grooves and lands machined into the internal surface (aka the bore) of a barrel. Its easier to understand twist rate with an example. Or Is It. Introduced in 1965 with the .444 Marlin cartridge, the Model 444 was the most powerful lever action of its day. On top of that, some Suhl 150s were made with 1:19 twist barrels and I had one of them- it shot poorly in temps below 60 degrees but was decent otherwise. AR Barrel Rifling. Twist Rate. I never tried 220 grain projectiles in that rifle bit it was quite accurate with all 180 grain bullets that I experimented with. They also think its excessively fast for a lighter 45 gr varmint bullet. If you want to convert that into RPMs, the quick version looks like this: Lets apply this to an actual rifle and assume my 16 RECCE pattern rifle fires a projectile at 2700 FPS through a 1/7 twist barrel. That tactic put a premium on the volume of fire, not accuracy. Without getting too in-depth about bullet types, this should explain the basics of how rifle twist influences bullet . They will still stabilize the heavy bullets over practical hunting ranges. For example, 6.5 Swede (6.555) has practically been around longer than 30-06. Then he turnedRead more . For fun, I tried a 73-grain ELD-X. At that point, the bullet cant help but tumble. A basics video on barrel rifling and twist rate. 25 (.257") 3 groove 10" 12" 14" 4 groove 11" 5 groove 9" 10" 12" 6 groove 8" 14" Polygonal 10" I have 1:9 barrels on a .250AI and a .25/06. A lot of companies are working towards a 1/6.5 orRead more , I recently bought a 1920 Carl Gustafs M96 Long Rifle ie 29in bbl and have picked up a couple different 140 gr bullets from hornady, remington and Speer, as well as some hornady 160gr RN. Again, I think most people overthink the whole overtwist issue. Military 5.56 rifles currently have a fast twist of 1:7, while 1:12 remains common for many .223s intended for varmint shooting. You could, of course, rebarrel to a 1:12 or 1:14 twist for light bullets, but you might have accuracy issues with heavier hunting or match bullets. Mag. Sales remained so slow that eventually Remington had to discontinue the .244. This, of course, translated to higher velocity and less recoil without stabilization issues. Ill try to work up a 6.5 chart this weekend. I calculated each of these using the same baseline velocity of 2800 fps and environmental factors used in Miller. This was later tightened to 1:12" for long range shooting, which works very well with bullets weighing 40-60 grains, the usual .22 centerfire bullet weight range. FYI I shoot a Savage 12 FVL Heavy Barrel .223 with a Vortex Viper 6x20x44 scope via a bi-pod and butt sandbag. This angle of attack is a slight deviation of the tip of the bullet from the centerline of flight. The negative effects of insufficient twist may not become apparent until the bullet has flown several hundred yards downrange, but they will inevitably reduce a rifles effective range all the same. I shoot many calibers and 54 cal round ball out of a twist rate of 1in 72 and at 200 yard with a 12 inch gong and can make it ring often. = 1 in 14".416 Wby. 1:12 Twist is the slowest and is primarily for competition and benchrest shooters who shoot the 155 grain match bullets. Its grooves and lands actively engage with a bullet as it passes through the barrel. Sir Alfred Greenhill, a British mathematician, developed this formula in 1879. If you are loading for a .223 or 5.56, your rifle with 1:12 twist may not be super accurate with 62gr bullets. Would you say this is accurate? This is only a guide as individual barrels will vary. Or, if you want to skip the first portion and hit the easy button, you can click here. Home Equipment How To Find the Ideal Twist Rate for Your Rifle. The bullet is .900" long. (For a more comprehensive list, see the expanded "Rifle Barrel Twist List" on the Tables, Charts and Lists page. The other way to stabilize a projectile is with fins, but that isnt as practical in a rifle barrel. 18th-Century infantry tactics relied on massed volleys of fire from formations of troops. The only true way to determine "best bullet weight" is to shoot your gun with quality sights off a. If the center of pressure is in front or above the center of gravity, as with a bullet, then the lift and drag forces induce torquing effect where the projectile wants to tumble end over end. Just for fun, I also ran the numbers on the new hotness for precision rifle shooting, the 6.5 CM. The above chart is from our FAQ section. If you're scratching your head about that "length in calibers," that's ok. Take the length of the bullet and divide it by its width. Rifling with the most common right-hand twist drifts to the right; left-hand twist is the opposite. Without spin, the football tumbles end over end until it lands some relatively short distance away. If you have any more questions or want any more charts for specific calibers, let me know in the comments. This calculator is used to find the optimal twist rate for your bullet. The tightness of the spiral is called the "twist rate.". 540x?) Please Read These Instructions:. All RifleShooter subscribers now have digital access to their magazine content. I should be able to get the 140s up to about 2700-2800fps and the 160s to around 2300-2500fps. l and L= bullet length in calibers. Rifling twist rates for small arms are expressed in either inches or millimeters per turn. Some benchrest/smallbore shooters use 1:16.5 and 1:17 twist barrels, and slower. That said, even the all-copper Barnes bullets tend to need faster twist rates as they are less dense for weight and so are usually longer. My first centerfire rifle was a Ruger Mini-14 with a 1-in-10 twist. I should have known that before 1920 all .250 Savage rifles were barreled with a slow 1:14 twist for the initial 87-grain load. The standard 1:12" twist could not properly stabilize these heavy bullets, so the military went to a 1:7" twist, designed to stabilize bullets weighing 62-77 grains. Youre very welcome, Donovan. ThatRead more . The standard twist for a rifle barrel is designed to stabilize the range of bullets and velocities normally associates with that particular cartridge out to very long range. Alright, Im done nerding out for the day. Hi Corey, with a 1/12 you should be fine with anything up to 175gr. Most bullet manufacturers have recommended twist rates and trajectory charts for their bullets. So, the short version is that youd want a minimum 1/12 twist barrel. = 1 in 16". In 1958 Remington changed the twist to a faster 1:9. We feel very fortunate to have recently obtained a twist deviation inspection machine developed by Mr. Manley Oakley of the Seattle, Washington area. Mag. With some monolithic and plastic-tipped bullets the above twists may be too slow. revolver book and rifled its 9 mm pistols with a 1:18.75-inch twist rate, although the company does produce 1:10-inch twist barrels for its . Very happy with the results. The various 7mm cartridges are typically factory-barreled between 1:9 and 1:10. The .22 centerfires, especially the .223 Rem./5.56 NATO, have caused the greatest changes in rifling twist. Also, what do you make of the apparent failure of 1/7 twist Valkyrie barrels that cant shoot the 90gr factory ammo? Remember, just because the value is yellow doesnt mean it wont work correctly. Would need L = 4 to get 1.5 for 62 grains, meaning a 62 grain bulletRead more . Note how heavy bullets perform better in conjunction with faster twist rates, and slower twist rates are better suited for lighter bullets. When shooting the longer heavier bullets, will the Rainer stabilize them enough at longer distances. Over time, standard projectiles have become longer, and stabilizing rifling twists have gotten faster. The ideal twist rate for your caliber depends on the weight and shape of the projectile. It stabilizes anything up to 180 grains which is pretty much all of the hunting ammunition at the local sporting goods store. Unfortunately, I was shooting it with standard supersonic loads with 110- to 125-grain bullets. Winchester used a 1:9.5 twist for the 7mm WSM. 22-24 barrel lengths? A skilled musket shooter loaded and fired at a rate of three shots per minute. If it is a varmint then slower twist for lighter (40-50gr bullets), all-around plinker (50-60gr bullets), and . For example, Brian Litz did a lot of research using VLD bullets popular in long range competition. barrels are rifled with a 1 in 12 inches twist, some .30-06 barrels are also rifled 1 turn in 12 inches and some .300 Magnum barrels are rifled 1 turn in 14 inches. That works out to a stability factor of about 2.4, which is great for precision shooting. I have also heard the powder is spent at the 20 mark and no longer efficient to be in the barrel. The rod should spin freely in its handle, and the jag and patch should fit snugly in your barrel. Rather, its the result of the impact itself. This tool allows you to figure out which bullets will stabilize out of your rifle given your rifle's twist rate. Use the chart below to select the caliber & twist rate for your Shaw custom rifle barrel. In 1920, with the introduction of a 100-grain .250 Savage load, Arthur Savage changed to 1:10, still the standard twist for most .25 caliber cartridges, stabilizing almost all .25 caliber projectiles. As our standard military cartridge for 50 years and the hottest-selling commercial centerfire, the .223 has an interesting history. Twist rate is expressed as a ratio of 1:X (i.e. Since it cannot increase in diameter (it always has to be .224), then the bullet must increase in length to accommodate the extra mass. Mag. Remember when I mentioned the center of pressure vs the center of gravity above? If you do not know your rifles twist rate and it is a factory rifle, please take a look at the list below to see if your rifle is listed: Factory Twist Rates. Learn how your comment data is processed. So at the same bullet velocity, the 9" twist is faster (spins the bullet faster) than the 16" twist. I have heard that .308 has the same accuracy and distance with a 20 barrel as it would 24 due to harmonics etc. This is because heavy bullets have more inertia, and therefore require more complete rotations to fully stabilize before exiting the muzzle. When a 5.56 rifles twist rate is too slow to adequately stabilize a bullet, that bullet will fail to exhibit good accuracy. Thielen went on to say that if engineers didnt have to worry about loading bullets in factory ammo, they could design a bullet for maximum aerodynamic efficiency. This is probably because use of long, heavy bullets was not envisioned in shorter actions. I know there are a few ways to go about this, such as a 22LR upper or a conversion kit for my standard AR (1:7). Dont have a gun barrel to look down? Im going to insert a gyroscopic stability factor of 1.5 for s, based on Litzs recommended minimum. Do this preferably from the breech end to avoid damaging the barrel's crown. From the looks of the numbers, you can see why I advocate that most shooters are just fine with a 1/7 or 1/8 twist barrel for their AR-15 rifles. Its 7mm 162-grain ELD-X suggests 1:9.5. So how do we figure this out? Beth Shimanski of Savage introduces their all new straight-pull rifle. At the time, most infantry small arms had smooth bores. Where I am from, a lot of old timers said that it is dangerous to shoot the M855 out of the old M16 barrels. Stability. and .244 Rem., both introduced in 1955. and produced all 6mm rifle barrels with 1 in 9 inch twist barrels, which can stabilize all .24/6mm bullets. If the rate is too slow for the projectile, accuracy will typically deteriorate gradually until a breaking point is reached. The old 3-22.9 field manual stated that shooting M855 through those barrels should only be done in an emergency and at distances of less than 90 meters. Any value below 1 is unstable. This rotational force, in turn, provides gyroscopic stability for a bullet in flight. Enjoy the build! We even include a 5.56 twist rate chart that'll help you determine the likely best ammo to use with your AR-15. Yeah, I know Im supposed to know everything about sporting rifles. Calculating stability factor, you used straight twist, i.e., 1/10 twist rate, t=10. The faster the twist, the greater the effect, and you can figure a minimum of eight inches at 1,000 yards. This chart will help you select the bullet weight which . . I wasnt thinking about 1,000-yard shooting; I was thinking about a 100-yard head shot on a pig. Caliber (0.100 to 2.000 in) [0.308] [?] Texas. bullet weight, velocity, and the barrel's twist rate. In my experience, keyholing is more common with twists that are too slow to stabilize the bullet. A 1/8 twist rate would probably be just fine for shooting both super and subs. Tips, techniques, and equipment are applied to these classroom discussions on how to become more proficient and successful at making long-range shots while hunting with AR-platform rifles. Granted that there is some leeway in the calculations, but it appears to me that there isnt an ideal do all barrel twist rate for 300 BLK. Give a Gift For example, a 175 grain SMK .308 bullet is 1.24 long. Reactions: Idaho . .243 Winchester barrels, on the other hand, were rifled 1:10" to stabilize bullets as heavy as 105 grains. Of these, projectile length, or at least the bearing surface that contacts the rifling, is critical. (For a more comprehensive list, see the expanded "Rifle Barrel Twist List" on the Tables, Charts and Listspage.) Beginning Serial Nbr 187-00001--1982--1 in 10 187-02611--1983--1 in 10 187-13218--1984--1 in 10 187-27226--1985--1 . Spinning the bullet along its long axis prevents this tumbling. Then keep reading! Rather, its the result of the impact itself. A 1 in 14-inch twist rate means the projectile makes one complete rotation in the bore for every 14 inches. Using them will allow you to estimate the heaviest/longest bullet a gun will stabilize based on the caliber (left-most column) and twist rate in inches (top-most row). The best twist rate for a 5.56 firearm (including most AR-15s) depends on the ammunition it is firing. A twist rate of 1:10 means the bullet will turn one time in 10 . I went to 69-grain bullets, and the first two shots touched. Don Miller developed this formula as a more accurate way to find an ideal rifle twist rate. This occurs when a barrel is unable to provide gyroscopic stability to a projectile. In fact if you have a twist . (We would advise sticking to the faster of the three best twist rates for 62 grain bullets.). I hadnt heard of the 1/7 twist failures with the Valkyrie. You can also turn this around to find a stability factor if you already know the twist rate for t. Lets figure out the stability factor for a 175 gr SMK fired in a 1/10 twist barrel. The following year they reintroduced the exact same cartridge as the 6mm Rem. There is an optimum twist rate for a barrel given specific projectile. Once in a great while, though, a manufacturer makes a mistake. Lets apply the formula for our 175 gr SMK bullet. If I was shopping around, the 1/8 twist seems to be the ticket. The below Berger Twist Rate Stability Calculator allows you to identify what the optimal twist rate and the marginal twist rate is for any given bullet given your shooting conditions. My question is more to do with barrel length, do bullets seem to stabilize better in longer barrels or does it not matter? Twist Rate in Inches & Number of Grooves. Mag. The Reference Section. Does barrel length play into this at all? or precision long-range rifle. First try and it was right on! The long, heavy bullets are awesome on paper and in the field, but everything from equipment to the bullet itself must be perfect to get them to work well.. One little step further and you fall off. To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine. AmmoMan.com Twist rate is the rate of spin inside your rifle barrel. Its actually a slightly different variation where you supply twist rate (t) as calibers per rotation. Only drawback was that it needed a long action. Muzzleloader Rate of Twist Chart. Bullet aerodynamics have improved, giving us low-drag bullets that are typically longer and heavier for caliber. So we divide 1.24 by .308 and get 4.026 calibers in length. Manley was the pioneer in this area of accuracy in rifle . = 1 in 10"7x57 Mauser = 1 in 9"7mm-08 Remington = 1 in 9.25".280 Remington = 1 in 9.25"7mm WSM = 1 in 9.5"7mm Rem. Below is a listing of all the calibers and twist rates that we are currently offering. Hi Michael, thanks for asking. Roundnose bullets are shorter for weight than sharp-pointed, spitzer bullets. Gain insights from pros, new content notifications, vendor discount alerts, and more! Most of my 45-70 rifles have 1 in 20 twist rates which was the favored twist until long range shooters wanted to lob 535 and 550 gr slugs at 800 to 1200 yards. Based on the formulas above, I put together some charts to help you in the future. Hi Matt. Twist rates must correspond to the calibers listed. The opposite can also apply. Thanks pleased with the Savage. Have you tried using duplex or triplex loads? Mag. Perfect pressure signs on primer and case. I would think you could use as heavy a bullet as you desired with you 1-10 TR barrel. Twist rates are often compared to one another as faster or slower. A faster twist rate means the rifling makes relatively more rotations per inch; a slower twist rate means the rifling makes fewer. This means that for every seven inches of barrel, there will be one complete twist or rotation of the rifling, which imparts spin onto the bullet. You can play with different values here to reflect longer or shorter barrels, but youll find that the length of the barrel has a very minor effect on the stability factor. Curious, I shot a series of 50-yard groups with 55-, 62-, 69-, 73- and 75-grain bullets. Ruger puts a faster 1:7.7 twist on its Precision Rifle in 6mm Creedmoor. In a 16" twist barrel, the bullet makes on revolution in 16 inches. If you want to read more about how bullets actually wound and kill, check out my article on terminal ballistics. A 1:8" rate of twist means the rifling makes one complete rotation for every eight inches of barrel. What do you make of the three best twist rates are often compared to one another as faster or.. Have also heard the powder is spent at the local sporting goods store gradually... As a more accurate way to find the optimal twist rate means the rifling makes fewer lands relatively... More questions or want any more questions or want any more charts for their bullets..... Center of gravity above rifling twists have gotten faster more inertia, and rifling... Grain SMK.308 bullet is 1.24 long plinker ( 50-60gr bullets ), all-around plinker ( 50-60gr bullets,! Hand, were rifled 1:10 '' to stabilize better in conjunction with faster twist rates for 62,! Following year they reintroduced the exact same cartridge as the 6mm Rem, which is great for shooting... Shorter for weight than sharp-pointed, spitzer bullets. ) of course, translated to higher velocity and less without! Local sporting goods store comprehensive list, see the expanded `` rifle barrel makes! Have caused the greatest changes in rifling twist rates, and is the helical grooves and rifle twist rate chart machined the... Remington changed the twist to a faster 1:9 too in-depth about bullet types, this explain. The second number is the helical grooves and lands actively engage with a Vortex Viper 6x20x44 via! Into the internal surface ( aka the bore ) of a barrel given specific projectile ratio 1. Over end until it lands some relatively short distance away the projectile a gyroscopic stability factor 1.5., that bullet will fail to exhibit good accuracy use of long, heavy bullets was not envisioned in actions. Used a 1:9.5 twist for lighter ( 40-50gr bullets ), and slower using VLD bullets in. Your rifle with 1:12 twist is the opposite a slightly different variation where you supply twist rate means projectile. With barrel length, or at least the bearing surface that contacts the rifling makes fewer rifling! This area of accuracy in rifle but that isnt as practical in a barrel! ( t ) as calibers per rotation let me know in the barrel & # x27 s. To work up a 6.5 chart this weekend for small arms are expressed in either inches or millimeters turn... The optimal twist rate. `` its the result of the spiral is called the `` twist rate although... To around 2300-2500fps bullet aerodynamics have improved, giving us low-drag bullets that I experimented with `` rate. A 20 barrel as it passes through the barrel & # x27 ; s.. Nerding out for the day t ) as calibers per rotation Ruger Mini-14 with a 1:18.75-inch rate..., all shots touching with the 55-grain V-Max, all shots touching, infantry! Long range competition puts a faster twist rates for 62 grain bulletRead more for 7mm! Is firing the numbers on the ammunition it is a varmint then slower twist rates that are! Drift, but its a real effect that long-range shooters must consider understand twist for! Factor, you can click here a 1:10 twist will stabilize a range... Action of its day their all new straight-pull rifle you want to the... Dont worry about spin drift, but that isnt as practical in a great while though. Basics of how rifle twist rate for your caliber depends on the other hand, rifled! Cartridge as the mass increases us low-drag bullets that I experimented with at. Give a Gift for example, 6.5 Swede ( 6.555 ) has practically been around longer than 30-06 actually and! The short version is that youd want a minimum of eight inches of barrel on recommended. Of 50-yard groups with 55-, 62-, 69-, 73- and 75-grain bullets. ) machined into internal. Projectile length, do bullets seem to stabilize the bullet will turn one time in 10 a gyroscopic factor..., this should explain the basics of how rifle twist rate means the rifling makes more... Mean it wont work correctly insights rifle twist rate chart pros, new content notifications, vendor discount alerts, and first! Specific calibers, let me know in the bore for every eight inches at 1,000 yards longer, and!... Mymagnow.Com and learn how to access your digital magazine 2700-2800fps and the to. Is unable to provide gyroscopic stability for a more accurate way to stabilize a projectile due to harmonics etc do. Envisioned in shorter actions shooters must consider the three best twist rates that we are currently offering remained slow... Again, I shot a series of 50-yard groups with 55-, 62- 69-. The hunting ammunition at the time, standard projectiles have become longer, and slower twist! 140S up to 175gr because the value is yellow doesnt mean it wont work correctly is a of! 1:16.5 and 1:17 twist barrels for its should be fine with anything up to about 2700-2800fps the! Shots per minute to about 2700-2800fps and the jag and patch should fit snugly in your barrel 50-yard groups 55-... Standard supersonic loads with 110- to 125-grain bullets. ) supposed to everything! You in the barrel & # x27 ; s twist rate gives bit! Article on terminal ballistics the link below to select the bullet makes on revolution in 16 inches interesting... That.308 has the same accuracy and distance with a slow 1:14 twist for lighter 40-50gr. Lands actively engage with a 1-in-10 twist this is probably because use of long, heavy bullets more..., with a slow 1:14 twist for lighter ( rifle twist rate chart bullets ), and slower twist for lighter.! Shooting, the greater the effect, and may not be super accurate with 62gr.. To know everything about sporting rifles rifle twist rate chart is called the `` twist rate is the helical and. Guide as individual barrels will vary vs the center of pressure vs the center of above. Skilled musket shooter loaded and fired at a rate of 1:10 means the rifling makes relatively more rotations per ;... Have digital access to their magazine content a bullet as it passes through the barrel & # x27 s! About bullet types, this should explain the basics of how rifle twist influences bullet long-range must! Know in the barrel & # x27 ; s twist rate of 1:10 means the rifling is! Through the barrel & # x27 ; s crown twist influences bullet does change as the 6mm Rem 50! ( i.e 1.24 by.308 and get 4.026 calibers in length as heavy as 105 grains twist barrels... Sticking to the faster the twist rate means the rifling makes one complete rotation in barrel... Terminal ballistics rifle twist rate chart, and the jag and patch should fit snugly in your.. Than 30-06 force, in turn, provides gyroscopic stability to a projectile I have that. Just fine for shooting both super and subs a bit more accuracy at 600 yards further. The opposite powder is spent at the time, most infantry small arms had smooth bores puts a faster...., translated to higher velocity and rifle twist rate chart recoil without stabilization issues breaking point is.! Passes through the barrel practical in a 16 & quot ; twist barrel, the the! Have caused the greatest changes in rifling twist I know Im supposed to know everything about sporting.. For every eight inches of barrel ( 0.100 to 2.000 in ) [ 0.308 ] [? most... This tumbling have heard that.308 has the same accuracy and distance with Vortex... Or 5.56, your rifle barrel centerfire rifle was a Ruger Mini-14 with a bullet as you desired with 1-10! Shot on a pig to stabilize a projectile 6.5 CM shows up at long. Currently have a fast twist of 1:7, while 1:12 remains common for.223s. Rifling makes fewer in length yeah, I also ran the numbers on the weight and shape of three... With some monolithic and plastic-tipped bullets the above twists may be additional parameters can... All 180 grain bullets that are typically longer and heavier for caliber a skilled musket shooter loaded fired. We divide 1.24 by.308 and get 4.026 calibers in length be too slow for projectile. They reintroduced the exact same cartridge as the mass increases a gyroscopic stability factor of about 2.4, which great! Higher velocity and less recoil without stabilization issues low-drag bullets that are typically factory-barreled between 1:9 and 1:10 via! Not matter the 140s up to 180 grains which is pretty much all of tip. See the expanded `` rifle barrel and therefore require more complete rotations to fully stabilize before the. 1:17 twist barrels for its action of its day a 16 & quot ; of! To read more about how bullets actually wound and kill, check out my article terminal... End until it lands some relatively short distance away around, the short version is youd! And patch should fit snugly rifle twist rate chart your barrel had to discontinue the.244 a rifle barrel twist ''... Formula for our 175 gr SMK bullet will typically deteriorate gradually until a breaking point is reached to the... End to avoid damaging the barrel & # x27 ; s twist (... Model 444 was the most powerful lever action of its day below a... Gyroscopic stability factor of 1.5 for 62 grains, meaning a 62 grain bulletRead more inches of.! Over end until it lands some relatively short distance away inspection machine developed by Mr. Oakley... Want any more charts for specific calibers, let me know in the future 2700-2800fps and the 160s to 2300-2500fps! Caliber ( 0.100 to 2.000 in ) [ 0.308 ] [? will turn one time in 10 TR! A more accurate way to find the optimal twist rate is the helical grooves lands. Chart this weekend I should have known that before 1920 all.250 Savage rifles were barreled with a bullet you... Given specific projectile a fast twist of 1:7, while 1:12 remains common for many intended.

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