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Thus the optimum rate of twist for this bullet should be approximately 12 inches per turn. The typical twist of .30-06 caliber rifle barrels is 10 inches per turn, accommodating heavier bullets than in this example. A different twist rate often helps explain why some bullets work better in certain rifles when fired under similar conditions.
The 7.92×33mm Kurz has a 2.22 ml (34.3 grain H 2 O) cartridge case capacity.. 7.92×33mm Kurz maximum C.I.P. cartridge dimensions.All sizes in millimeters (mm). Americans define the shoulder angle at alpha/2 ≈ 17.5 degrees. The common rifling twist rate for this cartridge is 240 mm (1 in 9.45 in), four grooves, Ø lands = 7.89 millimetres (0.311 in), Ø grooves = 8.20 millimetres (0.323 in ...
Also, the newer methodology proposed by Dr. Arthur Pejsa and the use of the G7 model used by Mr. Bryan Litz, ballistic engineer for Berger Bullets, LLC for calculating boat tailed spitzer rifle bullet trajectories and 6 Dof model based software have improved the prediction of flat-fire trajectories. [9] [55] [56]
A 254 mm (1 in 10 in) twist rate is also commonly applied. [ 11 ] According to the official C.I.P. ( Commission internationale permanente pour l'épreuve des armes à feu portatives ) rulings, the .308 Winchester can handle up to 415.00 MPa (60,191 psi) P max piezo pressure.
The recommended optional twist rate is one revolution in 10 in (250 mm). Both SAAMI and Weatherby recommend a freebore of .378 in (9.6 mm). Early .257 Weatherby rifles has a twist rate of 1 revolution in 12 in (300 mm) but all current rifles are manufactured with a twist rate of 1 revolution in 10 in (250 mm).
Lighter dangerous game such as leopard and lion are best served with lighter bullets which open up rapidly or bullets which fragment upon impact such as the A-Square 400 gr (26 g) Lion Load. African countries require a minimum caliber of either .375 in (9.5 mm) or .400 in (10.2 mm) for the hunting of dangerous game.
Improvement beyond this standard while still using standard .375 CheyTac brass is possible, but the bullets have to be very long and the normal cartridge overall length has to be exceeded. The common .375 CheyTac 292 mm (1:11.5 in) rifling twist rate also has to be tightened to stabilize very long projectiles.
The 8×60mm S bullet diameter is 8.22 mm (.323 in) as found in the 8×57mm IS. The new cartridge used the same bullet and therefore only the chamber of the rifle had to be modified (reamed out by 2 mm plus 1 mm of neck extension) to accommodate the slightly longer case. This operation was easily performed on Gewehr 98 and Karabiner 98k rifles ...