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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 Tornado is based on a .257 Roberts case that is improved and necked to .30 caliber, essentially the same as the .277 ICL Flying Saucer, but necked-up. Performance with a 150-grain (9.7 g) bullet is up to 3,360 ft/s (1,020 m/s), with a 180-grain (12 g) bullet is up to 3,030 ft/s (920 m/s) and with a 220-grain (14 g) bullet is up to 2,800 ft ...
Performance is very close to the .257 Roberts. Arguably it is a better overall cartridge for hunting than the more popular .30-30, but in recent years has lost ground to the .257 Roberts and flatter-shooting 6mm cartridges such as the .243 Winchester. [3] Currently, there are very few new firearms being made in .250 Savage.
On the other hand, a .223 Wylde chamber is used on .223 Rem rifle barrels to allow them to safely fire either .223 Remington or 5.56×45mm NATO ammunition. [6].223 Winchester Super Short Magnum [6].224 Kritzeck (wildcat of a .223 Remington with shortened neck) [7].224 Valkyrie
The 6mm Remington rifle cartridge, originally introduced in 1955 by Remington Arms Company as the .244 Remington, is based on a necked down .257 Roberts cartridge (itself a necked-down 7×57mm Mauser) using a .24/6mm bullet.
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The .257 Roberts uses the 7×57mm Mauser as its parent cartridge. The 6mm Remington is also based on the 7×57mm Mauser cartridge. The 7×57mm Mauser was also the parent case of the 6×57mm Mauser developed in 1895. [34]
Performance is far less than true .25 caliber magnum rounds such as the .257 Weatherby Magnum. In fact, ballistically it's almost identical to the improved version of the .257 Roberts, which P.O. Ackley said was his favorite choice for an all-around cartridge. [4]