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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).
Number of manufacturers producing complete cartridges - e.g. Norma, RWS, Hornady, Winchester, Federal, Remington, Sellier & Bellot, Prvi Partizan. May be none for obsolete and wildcat cartridges . H/R: Handgun (H) or rifle (R) - dominant usage of the cartridge (although several dual-purpose cartridges exist)
Weatherby rifle ammunition for the .257 Weatherby Magnum is manufactured by Norma of Sweden. Conley Precision Cartridge Company manufactures several premium lines of .257 Weatherby ammunition using Barnes, Nosler, Speer, Swift and Trophy Bonded bullets. Double Tap ammunition also offers loaded ammunition for sale.
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.
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]
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 ...
Norma was started in 1902 by three Norwegian brothers from Nordre Land, Lars Enger (1850-1917), Johan Enger (1852-1925) and Ivar Enger (1863-1942), whose company L.A.Enger & Co acquired an ammunition factory in Raufoss and later moved to Kristiania (modern day Oslo) as Norma Projektilfabrik A/S (Norma projectile factory stock company) a few years earlier in 1895.
In 2008, the most popular and useful .284 Winchester-case based cartridge was not the original, but rather the 6.5-284 Norma. This former wildcat, made by necking down the original Winchester .284 casing to 6.5mm (.264), was developed for long range target shooting where participants usually handload their ammunition.