257 Roberts Centerfire Ammunition

The .257 Roberts, also known as .257 Bob, is a medium-powered .25 caliber 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") and 6 mm, and the higher energy but harder recoil of larger popular hunting calibers, such as the 7 mm family and the popular .30-06.