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Earlier .257 Weatherby Magnum rifles had a twist rate of 1 rotation in 12 in (300 mm), which is too slow to stabilize long for caliber bullet. These bullets include most Barnes' bullets over 110 gr (7.1 g) and any conventional spitzer bullet of over 115 gr (7.5 g).
The .257 Roberts, also known as .257 Bob, [2] is a medium-powered .25 caliber rifle cartridge.It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the 5 mm (.22 in) and 6 mm (.24 in), and has more energy, but is harder recoiling, similar to larger hunting calibers, such as the 7 mm (.28 in) and 7.62 mm (.30 in).
The .25-06 Remington was a wildcat cartridge for nearly half a century before being standardized by Remington in 1969.. Its design was based on the .30-06 Springfield cartridge necked-down (case opening made narrower) to .257 caliber keeping a similar cartridge length of its parent case, thus being chambered in standard-length actions.
224 Valkyrie, Uses 6.8 SPC cases, trimmed shorter, and the shoulder re-formed at a lower location due to being designed for using relatively long "high BC" (Ballistic Coefficient) bullets. The neck is sized for .224 caliber bullets. 25-45 Sharps, Uses the standard military 5.56x45 case (also .223 cases), the neck is simply expanded to .257"
.303/25.25 Remington.25-45 Sharps.25-21 Stevens.25-25 Stevens.25 Winchester Super Short Magnum.250 Savage.25-06 Remington.25-20 Winchester.25-35 Winchester.25-45 Sharps.297/250 Rook.250-3000 Savage.255 Jeffery Rook.256 Gibbs Magnum.256 Newton.256 Winchester Magnum.257 Roberts.257 Weatherby Magnum.26 Nosler.260 Remington.264 LBC-AR
.25 caliber may refer to the following firearms ... Name Bullet Length Rim Base Shoulder Neck OAL .25 ACP: 6.375 (.251) ... .25-45 Sharps: 6.53 (.257) 44.7 (1.76) 9.6 ...
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The 25 WSSM has similar ballistics to the .25-06 but in a much shorter case. It is a necked-up version of the .243 WSSM , [ 1 ] which is in turn a shortened .300 WSM ( Winchester Short Magnum ). The WSSM cartridges are based on ballistics design philosophies that are intended to produce a high level of efficiency.