Classic quarter-bore beloved by riflemen. Perfect deer and antelope cartridge. Mild recoil with flat trajectory. 'Bob' to its friends.
Type: Rifle
Introduced: 1934, United States
Parent case: 7x57mm Mauser
Standardization: SAAMI
Bullet diameter: 0.257" (6.53 mm)
Case length: 2.233" (56.72 mm)
Overall length: 2.78" (70.61 mm)
Max pressure: 54,000 PSI
Rim type: Rimless
Primer: Large Rifle
Typical twist rate: 1:10
Muzzle velocity: 2800–3150 fps
Muzzle energy: 2200–2700 ft-lbs
Effective range: 500 yd
Common bullet weights: 87, 100, 110, 117, 120 gr
Primary use: Hunting, Target
Production status: Active
Also known as: .257 Bob · 6.5x57mm Roberts
History: Originated as wildcat in 1920s by Ned Roberts and A.O. Niedner, necking down 7x57 Mauser. Remington commercialized in 1934. Unfortunately, Remington used conservative loads due to weak surplus Mauser actions on market, neutering its performance. Proper handloads or +P ammunition show its true potential. Never achieved massive popularity but has devoted following. One of the most beloved…
Notable firearms: Remington Model 700, Ruger M77, Browning X-Bolt, Kimber 84M
Similar cartridges: .25-06 Remington, 6.5x55mm Swedish