Best Bullet for Rifle Twist formula?

Discussion in 'The Ammo & Reloading Forum' started by Vermonter, Oct 8, 2006.

  1. Vermonter

    Vermonter New Member

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    I found a formula for determing best bullet for rifle twist on pp 62-63 of ABCs of Reloading, 7th ed. Great. But unfortunately it requires knowing the bullet length, which I can only determine by actually measuring the bullet. This means I have to purchase the bullets first since I can't find that data listed anywhere. Obviously I want to know the answer so I can decide what to buy, not buy and measure later! Short of bringing my caliper to a gun shop, does anyone know where to find this bullet length information, or better yet another way to determine the maximum grain weight bullet that a particular rifling twist can handle?

    I'm primarily working on .223 and .308 for maximum match target accurary. I have a Tikka .223 bolt action and a .308 Remington, both with a 1:12 twist.
  2. 22WRF

    22WRF Well-Known Member

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  3. Vermonter

    Vermonter New Member

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    Thanks for the website link. Great resource for reloaders! Although the database doesn't give the bullet length, there is information on suggested rifle twist for a Berger bullet type when you click on the "?" icon. I checked out the links on this Reload Bench site to bullet manufacturers and so far, it seems that Berger s the provides the most complete bullet data.
    Last edited: Oct 8, 2006
  4. Crpdeth

    Crpdeth Active Member

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    Vermonter

    If all else fails why not jump on a large forum such as AR15.com? Go to the reloading section, state your problem and say "Hey if anyone would be kind enough to list their .223/.308 bullet types and their specific lengths that they use/have in their reloading nook, I would love to compile a list of those measurements".

    Here is a start should you choose to venture down this long winding road. :D

    Speer .308
    165 Gr BTSP
    1.185

    Hornady .308
    165Gr BTSP
    1.195


    Crpdeth
  5. Mark

    Mark New Member

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    I don't have a formula.

    1 in 12 will stabilize up to a 55 gr. bullet in .223, up to 180 gr. depending on configuration in .308 dia.
    Good luck.
    Mark
  6. Red Neck64

    Red Neck64 Former Guest

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    Location:
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    Rate of twisting.Marlin 336 in 3030 is one in 10".

    17 HMR = 1 in 9"
    .22 Long Rifle = 1 in 16"
    .222 Remington = 1 in 14"
    .223 Remington = 1 in 12"
    .22-250 Remington = 1 in 14"
    .223 WSSM = 1 in 12"
    .243 Winchester = 1 in 10"
    6mm Remington = 1 in 9"
    .243 WSSM = 1 in 10"
    .240 Wby. Mag. = 1 in 10"
    .25-06 Remington = 1 in 10"
    .257 Wby. Mag. = 1 in 10"
    6.5x55 Swedish Mauser = 1 in 7.5"
    .260 Remington = 1 in 9"
    .264 Win. Mag. = 1 in 9"
    .270 Winchester = 1 in 10"
    .270 WSM = 1 in 10"
    .270 Wby. Mag. = 1 in 10"
    7x57 Mauser = 1 in 9"
    7mm-08 Remington = 1 in 9.25"
    .280 Remington = 1 in 9.25"
    7mm Rem. SAUM = 1 in 9.25"
    7mm WSM = 1 in 9.5"
    7mm Rem. Mag. = 1 in 9.25"
    7mm Wby. Mag. = 1 in 10"
    .30 Carbine = 1 in 16"
    .30-30 Winchester = 1 in 12"
    .300 Savage = 1 in 10"
    .308 Winchester = 1 in 12"
    .30-06 Springfield = 1 in 10"
    .300 Rem. SAUM = 1 in 10"
    .300 WSM = 1 in 10"
    .300 Win. Mag. = 1 in 10"
    .300 Wby. Mag. = 1 in 10"
    7.62x39 Soviet = 1 in 7.5"
    .303 British = 1 in 10"
    .32 Win. Spec. = 1 in 16"
    8x57 JS Mauser = 1 in 9.25"
    .338-57 O'Connor = 1 in 10"
    .338 Win. Mag. = 1 in 10"
    .340 Wby. Mag. = 1 in 10"
    .357 Mag. = 1 in 16"
    .35 Remington = 1 in 16"
    .35 Whelen = 1 in 16"
    .350 Rem. Mag. = 1 in 16"
    .375 H&H Mag. = 1 in 12"
    .378 Wby. Mag. = 1 in 12"
    .416 Rem. Mag. = 1 in 14"
    .416 Wby. Mag. = 1 in 14"
    .44 Rem. Mag. = 1 in 20"
    .444 Marlin = 1 in 20"
    .45-70 Govt. (Marlin and Ruger rifles) = 1 in 20"
    .450 Marlin = 1 in 20"
    .458 Win. Mag. = 1 in 14"
    .460 Wby. Mag. = 1 in 16"
    Last edited: Oct 8, 2006
  7. Vermonter

    Vermonter New Member

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    Thanks to ya'll for the the input. I have a pretty good idea of where to start experimenting in getting "that perfect round" (the holy grail?) for these rifles. Thought I'd compare Hornady A-MAX moly with Berger's match grade bullets in the same grain weight using the same powder for my first reloading venture. It'll be awhile before I have results though. The .308 is out in California with a gunsmith getting "accurized" and we have to paint the floor in the workshop before we can set up the reloading "lab". I think I'm having too much fun for my own good.
  8. LDBennett

    LDBennett Well-Known Member

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    Some of the bullet manufacturers reloading manuals have 1:1 pictures of their bullets. You can either measure them directly on the page or measure and scale since you know the caliber of each bullet (bullet diameter).

    A 1 in 12 twist is pretty slow for modern day 223 bullets. Definitely stay away from anything heavier than 55 grains. There are a bunch of match bullets available in the 52 grain weights by many manufacturers. I believe they were developed when the common twist for 223 was 1 in 12. All the newer heavy 223 bullets were developed for the newer 1 in 9, 1 in 8 and 1 in 7 inch twists most common today. But do not use the lighter bullets in the faster twist unless they are Match grade bullets as the simple varible jacket thickness of standard bullet when shot in a fast twist 223 will cause them to literally explode before reaching the target. It happened to me, so believe it!

    LDBennett
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