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257 Roberts Ammo
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The .257 Roberts, also known as .257 Bob, is a medium-powered .25 caliber cartridge. It described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the .22 and 6mm and the intense energy but not the strong recoil of larger popular hunting calibers, such as the 7mm family and the popular .30-06.
- Parent case 7×57mm Mauser
- Case type rimless bottlenecked
- Bullet diameter .257 in (6.5 mm)
- Neck diameter .290 in (7.4 mm)
- Shoulder diameter .430 in (10.9 mm)
- Base diameter .472 in (12.0 mm)
- Rim diameter .473 in (12.0 mm)
- Case length 2.233 in (56.7 mm)
- Overall length 2.775 in (70.5 mm)
- Rifling twist 1-10"
- Primer type large rifle