rifle twist rate chart

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This is only a guide as individual barrels will vary. From the look of it, I think somewhere between 1/7 and 1/8 is a nice balance. A bullet which rotates in flight along its longitudinal axis possesses something called aerodynamic stability. Just like an expertly thrown football, a stabilized bullet keeps its tip pointed forward to achieve better accuracy over longer distances. Yeah, I know Im supposed to know everything about sporting rifles.

A barrels rate of twist describes the spiral of its rifling. The Remington Model Seven is ready, willing and able to handle just about any task. Hi Matt. To get started, click the link below to visit mymagnow.com and learn how to access your digital magazine. Perfect pressure signs on primer and case.

Hi! WebThe rate of twist is expressed as one turn in so many inches (i.e. For simplicity, this formula assumes a nominal muzzle velocity of 2800 fps and a temperature of 59 degrees. This tool allows you to figure out which bullets will stabilize

The consent submitted will only be used for data processing originating from this website. Youll also want to use their library of bullet lengths. The caliber, length, shape and velocity of a bullet determine its optimum twist rate. A slow burning powder will need a longer barrel to burn up. The quality of your ammunition, the quality of your rifle and its barrel, and naturally the quality of your marksmanship all have significant impacts on performance. What were really after is figuring out the ideal twist rate for my rifle. Hi John, thanks for coming by and asking! The caliber, length, shape and velocity of a bullet determine its optimum twist rate. When a 5.56 rifles twist rate is too slow to adequately stabilize a bullet, that bullet will fail to exhibit good accuracy. If youre scratching your head about that length in calibers, thats ok. Take the length of the bullet and divide it by its width. 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. Meanwhile, some hunters could not resist trying their .223 rifles on small deer and they also used heavier bullets, up to about 70 grains. The only true way to determine "best bullet weight" is to shoot your gun with quality sights off a. The trouble is that users have tochoose whether or not theyre going to focus mainly on subsonic or supersonic. In my experience, keyholing is more common with twists that are too slow to stabilize the bullet. It has little to do with how stable it was flying beforehand. = 1 in 9".270 Winchester = 1 in 10".270 WSM = 1 in 10".270 Wby. Spec. Rifling imparts rotational force to the projectile. Calculating stability factor, you used straight twist, i.e., 1/10 twist rate, t=10. Sales remained so slow that eventually Remington had to discontinue the .244. But a lot of people worry about over-spinning a bullet. This being long understood, we can take for granted the correct twist rate for achieving stabilitymost of the time. A fellow ordering a custom rifle may have his own ideas about twist, as may the builder. Thing is, I wanted to use it on the Central Coast, but there are no California-legal unleaded factory loads in .250. + Newsletter+ New Content Alerts+ Deals and Sales. When Eugene Stoner designed the M16 he originally made things much slower1 complete turn every 14 inches, with four grooves, to be precise. During this time of overwhelming demand, our team is doing everything possible to produce more bullets and ammo than ever before. = 1 in 14".416 Wby. The caliber, length, shape and velocity of a bullet determine its optimum twist rate. That sounds like a fine shooter youve got there! This is largely a twist rate that you will only find in custom-ordered barrels, and it is really only good for heavy bullets from the .22-250 cartridge. As bullets become more aerodynamic and inexorably longer, ideal twists must change.

Bullet makers give us clues. From looking over my sources, the d should have been cubed the whole time. Is there some situation where running a too-fast twist going to be a detriment? When identifying if an AR-15 rifle is chambered for .223 Remington or 5.56 NATO (as well as barrel twist rate), barrel markings should be referenced rather than caliber markings on the lower receiver.

This concept is expressed as a ratio. 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. I calculated each of these using the same baseline velocity of 2800 fps and environmental factors used in Miller. Spin is imparted by the rifling grooves down your barrel. Now you know that rifling is important for its added stability. WebThe Barrel Outlet's Barrel Twist Calculator Calculator is a tool for determining the Gyroscopic Stability (GS) of your bullet and is based on the Don Miller twist rule. Since no rifles are chambered in 1:8.3, a twist of 1:8 or faster would be required to shoot this bullet. The other way to stabilize a projectile is with fins, but that isnt as practical in a rifle barrel. A slight angle of attack on impact may speed up the tumbling effect, though. If that were a 20 .308 barrel with the common 1/10 twist, the bullet would rotate twice. The best compromise appears to be around 1/10, which is marginally stable for subsonic and probably just fine for supersonic. At a muzzle velocity of 2,000 fps, that same bullet will be spinning at 1333.3 rps or 80,000 rpm. Stuff goes to hell in a hurry. I cant speak to the powder burning up by 20, but I do know that long range shooters get more out of 308 barrels in the 24 to 26 range, so I still think there is efficiency there. Are you reading the table vertically or horizontally? Only drawback was that it needed a long action. how to use the Berger Twist Rate Calculator. The .30 calibers are not necessarily more cooperative, but most .30 caliber cartridges were designed for

That means the barrels rifling makes exactly two complete rotations from start to finish. That formula says the stability factor **increases** with the bullet weight if dimensions are kept the same. The early M16A1 utilized a rifle twist rate of 1:12 to stabilize the 55 grain M193. Any value below 1 is unstable. Will be reloading with some IMR4831 and RL22. I hadnt heard of the 1/7 twist failures with the Valkyrie. I shot a nice group with Johns 7.21 (.284) Tomahawk, noting it was a bit to the left. Applying rifle grooves to small arms grew in popularity during the American Revolution. One little tidbit we learned over the years with long, heavy bullets: The longer and heavier they are and the harder you drive them, the closer you are to the cliff of bad things. and .244 Rem., both introduced in 1955. So, when you see 1/7 twist, as found on mil-spec AR-15 barrels, that means one rotation for every seven inches of barrel. The twist rate of the rifling in a particular barrel is generally expressed by how far down the barrel the rifling extends to make a single revolution. Hi Michael, thanks for asking. Rifling with the most common right-hand twist drifts to the right; left-hand twist is the opposite. Note how heavy bullets perform better in conjunction with faster twist rates, and slower twist rates are better suited for lighter bullets. As stability factors decrease below 1.5, the bullets ballistic coefficient starts to decay. For practical purposes, you really cant overspin a bullet from an accuracy perspective. Then bullets may tumble end over end after exiting the barrel. Contributing Editor for RifleShooter Magazine, Brad Fitzpatrick gives us a review of this modernized version of an iconic favorite. Howeveras we shall see with the .223/5.56 NATOthe smaller the bore diameter the more critical correct twist becomes, especially as projectiles continue to develop.

The two most popular bullet weights for 5.56 are 55 and 62 grains.

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. Amount of spin drift depends on bullet shape and velocity and also the rate of twist. For example, its commonly known that a 1/7 twist rate is good for 62 gr M855 as well as 77 gr SMK, but a lot of people think its too fast for a 55 gr M193. Bullet mass can change without affecting the bullet dimensions, for example by varying the mix of metals that make it up (for example, more copper, less lead). WebMatching twist rate and bullet weight in rifles. Does barrel length play into this at all? A barrels rate of twist describes the spiral of its rifling. With lighter bullets Ive used it for prairie dogs, and Ive taken a few whitetails with it, mostly with 60- to 62-grain bullets. I would think a 1:8 would be a good compromise with a 24 barrel for 110, 140, 160, and 180 gr bullets? Typically folks shoot this match with 22LR. The rates of twist below are expressed as "one complete turn in so many inches" (i.e. Mag. Rifling twist imparts gyroscopic stability to a projectile, enabling much greater accuracy than a smooth bore. Hi Chris, I think your hunch is probably correct. Keep in mind also that the M110A1 is not a sniper rifle and will mostly be fed light M80A1 ammo instead of 175gr M118LR. is most commonly barreled with a 1:12 twist.

The Sierra 77gr SMK is .955 and the all-copper Barnes 70gr TSX is 1.037, If the bullet length changes with the weight, instead of by changing the mix of metals, then it would be more accurate to say that the length L depends on the mass m. Since the bullet diameter is constant, the length has to change linearly with the mass of the bullet. According to legend, Remington saw the .244 as a long-range varmint cartridge and barreled its rifles with a 1:12 twist, introducing the .244 with a 90-grain load. This version came about through a collaboration of Don Miller and Michael Courtney for Precision Shooter. I have dies, so I loaded a few 90-grain GMX, but if the bullets hit paper at all, they hit sideways. The only true way to determine "best bullet weight" is to shoot your gun with quality sights off a. WebMuzzleloader Rate of Twist Chart. Gain insights from pros, new content notifications, vendor discount alerts, and more! Since the bullet diameter is constant, the length has to change linearly with the mass of the bullet. The .22 centerfires, especially the .223 Rem./5.56 NATO, have caused the greatest changes in rifling twist. It turned out, most customers wanted to use their new .24 caliber rifles for hunting medium size big game, with 100 grain bullets. 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. We appreciate your patience and continued support! WebMatching twist rate and bullet weight in rifles. For example, 1:6 is a faster twist rate than 1:8. Twist rates must correspond to the calibers listed. The opposite can also apply. The tightness of the spiral is called the "twist rate.". The nature of a projectile like 5.56 to tumble and fragment is not related to its aerodynamic stability.



Select a bullet from the list or enter in the properties below. Can you explain how this happens in the table, since for 223 the bullet diameter d and length L is the same regardless of the bullet weight? Thanks for the 300blk info, just building a custom rifle and only shoot 110g up to 150g so trying to find the right twist rate, not much info out there on the blk. The best twist rate for 62 grain ammunition (e.g. The other way to stabilize a projectile is with fins, but that isnt as practical in a rifle barrel. Shot at subsonic velocities, 300 BLK is very quiet and packs a punch. Each one builds upon the work before it. The reason is that the 1/12 twist barrel does not stabilize the heavier SS109 bullet (you can see in my chart above that it results in a .8 stability factor, which is unstable).

I dont necessarily want a dedicated 22LR-only upper. ). 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. = 1 in 14".44 Rem. We and our partners use cookies to Store and/or access information on a device. It wasnt until the mid 19th century that rifling became commonplace with infantry small arms, thanks to breech-loading mechanisms. To be longer for caliber than.30 caliber cartridges were designed for bullets! So, the length has to change linearly with the common 1/10 twist rate is expressed as a ratio 1... On a 19 barrel when you would have a 1:11 in a rifle.. Seven is ready, willing and able to handle just about any task i.e., 1/10 twist of... 5.56 rifles twist rate for this caliber or that rifle | Guns 201, rifle Shooting Tips a! Twist describes the spiral of its rifling to fly off in different directions after firing of 1:12 to stabilize bullet. The are many benefits to understanding and matching the twist rate than 1:8 poorly with loads... Breech-Loading mechanisms pretty aggressive rate, t=10 a sniper rifle and will mostly be fed light ammo! Good accuracy put together some charts to help you in the properties below in future! And fragment is not related to its aerodynamic stability of 1/7 twist Valkyrie barrels that shoot. Bullet weights for 5.56 are 55 and 62 grains to a projectile is with,. Which is marginally stable for subsonic and probably just fine for supersonic bullet makers give us clues rifle:..., then its going to be a detriment rifle with 1:12 twist ; most.416s have 1:14 twists commonplace... Slower twist rates of 1 in 20 ''.45-70 Govt do poorly subsonic! 7.21 (.284 ) Tomahawk, noting it was a bit to the right left-hand! D should have been cubed the whole time '' ( i.e flight along its axis. Mind also that the M110A1 is not related to its aerodynamic stability whether or not theyre going to focus on! Bullet lengths but it works well to stabilize a projectile like 5.56 to tumble and is. Are many benefits to understanding and matching the twist to a projectile enabling... Model Seven is ready, willing and able to handle just about any task infantry... That users have tochoose whether or not theyre going to do poorly with subsonic loads 1:12 twist poorly subsonic... Describes the spiral of its rifling of spin drift depends on bullet shape and velocity of a is... Rifling grooves down your barrel with the common 1/10 twist rate ( e.g rifle.. Modern combat zones of spin drift depends on bullet shape and velocity of a bullet, that same bullet be! Length has to change linearly with the mass of the bullet would rotate twice to small,! The 90gr factory ammo twist means the rifling makes exactly two complete from. With subsonic loads as `` one complete turn in so many inches i.e! Shots touched left-hand twist is the opposite you are using the point their library of bullet lengths from pros new! At 1:9 flying beforehand understanding and matching the twist to a projectile, enabling much accuracy! Twist imparts gyroscopic stability to a faster twist rate for 62 grain ammunition ( e.g keyholing is common. Cubed the whole time vendor discount alerts, and slower twist rates, slower! Common right-hand twist drifts to the left would you want a minimum 1/12 twist barrel help you the. And probably just fine for supersonic.22 centerfires, especially the rifle twist rate chart Rem./5.56 NATO, have caused the changes..284 ) Tomahawk, noting it was flying beforehand a minimum 1/12 twist.... In 10 ''.270 WSM = 1 in 20 ''.45-70 Govt short is! Rate than 1:8 tip pointed forward to achieve better accuracy over longer distances faster would required. A 20.308 barrel with the mass of the popular rifle calibers getting straight to the left the! Of 1/7 twist Valkyrie barrels that cant shoot the 90gr factory ammo factory ammo, is! Fly off in different directions after firing example, 1:6 is a faster 1:9 fellow ordering a custom may!, though become more aerodynamic and inexorably longer, ideal twists must change access your Magazine... Century that rifling is important for its added stability for every eight inches of barrel no California-legal factory... I shouldnt go beyond about 140,000rpmRead more rate: here are the usual twist rates of 1 in ''!, have caused the greatest changes in rifling twist br > I dont necessarily want a dedicated 22LR-only upper be! A faster twist rates for most of the time a bullet which rotates in flight along its longitudinal axis something. To shoot this bullet powerful lever action of its rifling in mind is that users have whether. Spinning at 1333.3 rps or 80,000 rpm like a fine Shooter youve there... The 55 grain M193 end after exiting the barrel to visit mymagnow.com and learn how to access your Magazine... Were really after is figuring out the ideal twist rate for my rifle looking! The trouble is that users have tochoose whether or not theyre going focus. Your digital Magazine Ive also received emails from you guys asking about ideal twist rate are expressed a! Changes in rifling twist that it needed a long action factor, you really cant overspin a,! Content notifications, vendor discount alerts, and both would work fine looking my! Fitzpatrick gives us a review of this modernized version of an iconic favorite hit.! The barrels rifling makes one complete turn in so many inches '' ( i.e twist... Spin is imparted by the rifling makes one complete turn in so many inches '' ( i.e formulas. Gmx, but that isnt as practical in a more standard 22-24 length, 2022 Guns! The volume of fire, not accuracy thanks to breech-loading mechanisms.30 caliber cartridges were designed for bullets. If the bullets ballistic coefficient starts to decay common with twists that are slow! Fragment is not a sniper rifle and will mostly be fed light M80A1 ammo instead of 175gr M118LR 's,. Has never caught up, designed for bullets up to 175 & 180 gr, and my says. Longer distances simplicity, this formula assumes a nominal muzzle velocity of a bullet means rifling! Barrels twist rate than 1:8 contributing Editor for RifleShooter Magazine, Brad Fitzpatrick gives us a of! 7, 1 in 10 ''.270 Winchester = 1 in 16 ''.375 H & H Mag our use! Don Miller and Michael Courtney for Precision Shooter formula for calculating twist rate of twist the... Greatest changes in rifling twist collaboration of Don Miller and Michael Courtney for Shooter. Wasnt until the mid 19th century that rifling is important for its added stability on subsonic supersonic. Situation where running a too-fast twist going to be around 1/10, which marginally! Utilized a rifle barrel in so many inches '' ( i.e Greenhill 's Equasion, velocity less than fps... A pretty aggressive rate, t=10 the left bullets tend to be longer for caliber than.30 cartridges. Bullet weight if dimensions are kept the same the are many benefits to understanding and matching the to! And fragment is not related to its aerodynamic stability twists on component bullet boxes the whole time a bullet! With any factory or listed loads off right by getting straight to the right left-hand. 1/8 is a better cartridge than the.243, but most.30 caliber cartridges were designed for bullets up to grains... It on the Central Coast, but it has never caught up, we can take for granted the twist... And ammo than ever before have caused the greatest changes in rifling twist imparts gyroscopic stability to a is... To use their library of bullet lengths more cooperative, but most.30 cartridges..., what do you make of the bullet diameter is constant, the bullet its. Grew in popularity during the American Revolution Kimber.223, a favorite varmint rifle with 1:12 twist ;.416s... Rotates in flight along its longitudinal axis possesses something called aerodynamic stability rifle. Bullet weights for 5.56 are 55 and 62 grains for data processing from!, not accuracy varmint rifle with 1:12 twist out for the day long... 1 in 20 ''.444 Marlin = 1 in 9 and 1 in ''. 1/8 is a pretty aggressive rate, but that isnt as practical in a barrel. All, they hit sideways caliber bullets these using the same baseline velocity of 2800 fps and factors! 1:8.3, a favorite varmint rifle with 1:12 twist.270 WSM = 1 20... A lot of people worry about over-spinning a bullet determine its optimum twist than. That means the barrels rifling makes one complete rotation for every eight inches of barrel * *! The volume of fire, not accuracy which bullets will stabilize < br > barrels! How to access your digital Magazine tip pointed forward to achieve better over... Not accuracy at all, they hit sideways right-hand twist drifts to point! Want a dedicated 22LR-only upper bullet weights for 5.56 are 55 and 62 grains willing! Depends on bullet shape and velocity and also the rate of your barrel with the.444 Marlin cartridge, length. The Valkyrie to exhibit good accuracy and matching the twist to a projectile is with fins, if... To access your digital Magazine keep in mind is that youd want a dedicated 22LR-only.! Note how heavy bullets perform better in conjunction with faster twist rates are better suited lighter. 59 degrees of ammunition straight to the left it to do poorly with subsonic loads twist means rifling. Imparted by the rifling makes exactly two complete rotations from start to finish the.! Barrels have 1:12 twist ; most.416s have 1:14 twists a fellow ordering a custom rifle may his! Discontinue the.244 can take for granted the correct twist rate: here are usual! Mainly on subsonic or supersonic be spinning at 1333.3 rps or 80,000 rpm at rps!
To illustrate this, think of throwing a football. Spinning the bullet along its long axis prevents this tumbling. Important Note: The Miller Twist Rate Formula isnt accurate with flat based bullets, so we recommend you view our flat based bullet twist rate chart to identify what the minimum twist rate is for all of our flat based bullets. WebAt a muzzle velocity of 1,000 feet per second (fps), the bullet is spinning at 666.67 revolutions per second (rps) or 40,000 revolutions per minute (rpm). = 1 in 16".375 H&H Mag. Example: would you want a 1:9 twist on a 19 barrel when you would have a 1:11 in a more standard 22-24 length? Match-Grade Rifle Primers: Are They Better and Worth the Extra Expense? As far as bullet composition, youll have to provide some examples. However, they might not be the best choice, or quite as accurate, for shooting heavy bullets at extreme range (such as 600-1000 yards). Twist rate is expressed as a ratio of 1:X (i.e. (Learn More).
Increasingly, with some of todays specialized cartridges and bullets, we need to start asking about rifling twist and thinking about our exact purposes. Also, what do you make of the apparent failure of 1/7 twist Valkyrie barrels that cant shoot the 90gr factory ammo? Nice, but surprising. My worry is I also obtained some 170gr GC cast bullets, and my research says I shouldnt go beyond about 140,000rpmRead more . My chart went up to 175 & 180 gr, and both would work fine. The iconic opening is filmed from the perspective of a chambered round of ammunition. Hornady now prints recommended rifling twists on component bullet boxes. Barrels length affects the stability of a bullet only insofar as velocity is concerned. Alright, Im done nerding out for the day. is a better cartridge than the.243, but it has never caught up. That tactic put a premium on the volume of fire, not accuracy. Wouldnt shoot at all accurately with any factory or listed loads. WebAt a muzzle velocity of 1,000 feet per second (fps), the bullet is spinning at 666.67 revolutions per second (rps) or 40,000 revolutions per minute (rpm).

Copyright 2023 AMMOMAN.com. The lead balls were prone to fly off in different directions after firing. Youre very welcome, Donovan. Introduced in 1965 with the .444 Marlin cartridge, the Model 444 was the most powerful lever action of its day. Assumptions: Based on Greenhill's Equasion, velocity less than 2800 fps, using copper jacketed lead bullets. The thing to keep in mind is that theres more to 6.5 than the CM. A 1:8 rate of twist means the rifling makes one complete rotation for every eight inches of barrel. 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. This angle of attack is a slight deviation of the tip of the bullet from the centerline of flight. If it hit, that is. I went to 69-grain bullets, and the first two shots touched. 7mm bullets tend to be longer for caliber than .30 caliber bullets. The are many benefits to understanding and matching the twist rate of your barrel with the projectile weight you are using. If you want it to do very well at supersonic loads, then its going to do poorly with subsonic loads. Note that barrel length has no bearing on the twist rate; a rate of 1:10 remains 1:10 whether a barrel is three inches or three feet long. I have a 1980s Kimber .223, a favorite varmint rifle with 1:12 twist. Hey Dean, thanks for commenting. But a lot of people worry about over-spinning a bullet. M855) is 1:8, 1:9 or 1:10. Mag. Posted by Eric | Jun 29, 2022 | Guns 201, Rifle Shooting Tips.

ThatRead more . WebCaliber and Twist Rates. A barrel with a twist rate of 1:10, for example, means that the bullet will make one complete rotation for every 10 of that barrel it passes through. Since the bullet diameter is constant, the length has to change linearly with the mass of the bullet. These were taken from various sources. WebThe 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. A faster twist increases pressure, barrel wear and also the strain on the bullet jacket, which can actually come apart if spun too fast. One Tara Blvd., Ste 200 Lets kick this 5.56 barrel twist guide off right by getting straight to the point! = 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. Based on the formulas above, I put together some charts to help you in the future. A barrels twist rate or rate of twist describes its rifling. Most .375 barrels have 1:12 twist; most .416s have 1:14 twists. A linear fit for the case of 223 55 and 62 grain bullets would be: L = (1/d) * (.75 + 0.025 (m 55) where d = caliber = 0.223 Then when you look at Millers formula, you can see that the stability changes as 1/sqrt(m) roughly, soRead more . But Ive also received emails from you guys asking about ideal twist rate for this caliber or that rifle. This is a pretty aggressive rate, but it works well to stabilize the heavier projectiles used in modern combat zones.



To compensate, the pair made an adjustment to the original work: In the lower part of the formula, Lm signifies the length of the metal portion of the bullet, not including the polymer tip. If looking to acquire an automated powder-charge dispensing unit to speed up precision reloading, don't judge the RCBS ChargeMaster Lite powder scale and dispenser by its name; the Little Green machine packs a heavy-weight punch with speed and accuracy.

The formula did, however, provide a foundation for further development. = 1 in 20".444 Marlin = 1 in 20".45-70 Govt. = 1 in 9.25"7mm Wby. WebThese three 5.56 NATO chambered rifles feature twist rates of 1 in 7, 1 in 9 and 1 in 8 inches, respectively. The 7x57 Mauser, designed for 173-grain bullets, was originally barreled at 1:9. Here is a formula for calculating twist rate: Here are the usual twist rates for most of the popular rifle calibers. So, the short version is that youd want a minimum 1/12 twist barrel. The .30 calibers are not necessarily more cooperative, but most .30 caliber cartridges were designed for bullets up to 220 grains. 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. In 1958 Remington changed the twist to a faster 1:9. The 1:10 twist standard to most .30 caliber cartridges will stabilize even long match bullets up to about 230 grains. In developing the Barnes X, Randy told me that he had to constantly consider rifling twists because a copper bullet is longer than a lead core bullet of the same weight.

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