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257 Roberts Ammo

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The most popular and commercially available 257 Roberts bullet weights are 100 and 117 grains. Performance ballistics for 257 Roberts ammo 117 grain bullets are found in the following table.

257 ROBERTS VELOCITY
100 yd 200 yd 300 yd 400 yd 500 yd
117 gr 2,707 ft/s 2,480 ft/s 2,265 ft/s 2,060 ft/s 1,866 ft/s
257 ROBERTS ENERGY
100 yd 200 yd 300 yd 400 yd 500 yd
117 gr 1,903 ft⋅lb 1,598 ft⋅lb 1,332 ft⋅lb 1,102 ft⋅lb 905 ft⋅lb

Disclaimer: Actual velocity and energy ballistics may vary.