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Miller twist rule is a mathematical formula derived by American physical chemist and historian of science Donald G. Miller (1927-2012) to determine the rate of twist to apply to a given bullet to provide optimum stability using a rifled barrel. [1]
Rifling twist: 1 in 9 in (229 mm) Primer type: Large rifle magnum: Maximum pressure (SAAMI [1]) 65,000 psi (450 MPa) Ballistic performance; Bullet mass/type Velocity ...
The 7.92×57mm Mauser can offer very good penetrating ability due to a fast twist rate that enables it to fire long, heavy bullets with a high sectional density. [citation needed] The 7.92×57mm Mauser cannot be used in countries that ban civil use of former or current military rifle cartridges, though since 2013 is no longer restricted in France.
.243 Winchester with a 1:7.7 twist, 26 in (66 cm) barrel, weighing 11 lb (5.0 kg) A newer Ruger Precision Rifle "Gen 2" was announced on 6 May 2016 with several enhancements over the original. [ 4 ] The new version includes a new handguard, a hybrid muzzle brake (5/8-24 threaded) , and a billet aluminum bolt shroud.
The .32-20 Winchester / 7.94x33mmR, also known as .32 WCF (Winchester center fire), was the first small-game lever-action intermediate cartridge that Winchester produced. [4] It was initially introduced as a black-powder cartridge in 1882 for small-game, varmint hunting , and deer.
Care must be taken to confirm what twist rate was used, as the earlier West German 7mm Weatherbys used a 1-in-12 twist vs the faster 1-in-10 twist for those of later manufacture. The 1x12 twist rifles will not stabilize bullets over 150 grains, while the 1x10 twist rifles will stabilize bullets weighing up to 175 grains.
The 7×64mm's rimmed sister cartridge, the 7×65mmR, is also very popular in Central Europe for the same reasons as the 7×64mm. The legal banning of ex-military service cartridges like the .308 Winchester , 7×57mm Mauser , 8×57mm I, 8×57mm IS and the .30-06 Springfield in countries like France and Belgium also promoted acceptance and use of ...
The twist rate for the 7x64 is 1 in 8.66 inch against 1 in 10 inch for the 280 Remington. Nearly every European rifle producer offers the 7x64 as a standard caliber. The .280 Remington does, however, have a larger than expected number of European users in imported self-loading rifles such as those by Remington.