Load data for .257 Roberts + 87gr Speer Hot-Cor

Based on C.I.P., the max. allowed case length is 2.233 in / 56.72 mm, the max. cartridge length is 2.775 in / 70.49 mm, and the max. allowed pressure is 51,488 PSI / 3,550 bar.

Based on C.I.P., the max. allowed case length is 2.233 in / 56.72 mm, the max. cartridge length is 2.775 in / 70.49 mm, and the max. allowed pressure is 51,488 PSI / 3,550 bar.

Load Specifications

ImperialMetric

Bullet:.257 | 87gr | Hot-Cor

Cartridge:.257 Roberts load data

Case Length (L3):2.233" | 56.7 mm

Cartridge Length (COL/L6):•••

Seated Depth:0.293" | 7.4 mm

Case Capacity:58 gow | 3.76 cm³

Primer Size:Large Rifle (LR)

Max. Pressure (C.I.P.):51,488 psi | 3,550 bar

Barrel Length:24.0" | 610 mm

Min. Twist Rate:1:14.5

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Community Loads for .257 Roberts + 87gr Speer Hot-Cor

Real loads for this combination shared by our community. Charge weights are only fully visible with an active Pro licence.

Charge (gr)	C.O.L.	Barrel Length	Velocity (fps)	Pressure (psi)

48.0 gr	2.760"	—	2826 fps	•••
52.0 gr	2.760"	—	3086 fps	•••

46.2 gr	2.760"	—	3284 fps	•••

•••	2.760"	—	3144 fps	•••

•••	2.760"	—	3068 fps	•••

•••	2.760"	—	2920 fps	•••
•••	2.760"	—	3241 fps	•••

•••	2.760"	—	2933 fps	•••
•••	2.760"	—	3189 fps	•••

•••	2.760"	—	2954 fps	•••
•••	2.760"	—	3207 fps	•••

•••	2.760"	—	2772 fps	•••
•••	2.760"	—	3031 fps	•••

•••	2.760"	—	3173 fps	•••

•••	2.760"	—	2818 fps	•••
•••	2.760"	—	3067 fps	•••

•••	2.760"	—	3078 fps	•••

•••	2.760"	—	2973 fps	•••

•••	2.760"	—	3169 fps	•••

•••	2.760"	—	2835 fps	•••
•••	2.760"	—	3095 fps	•••

•••	2.760"	—	3004 fps	•••
•••	2.760"	—	3322 fps	•••
•••	2.760"	—	2953 fps	•••
•••	2.760"	—	3235 fps	•••

Charge weights beyond the first rows and all pressure values are only visible with an active Pro licence.