.257 Roberts (IMR Data) Load Data

11 published .257 Roberts (IMR Data) reloading recipes across 7 powders and 1 bullet manufacturers, with bullet weights from 100 to 120 grains and recorded velocities between 2,615 and 2,950 fps. Every load lists charge weight, velocity, COAL, primer and case where the source published it.

Always begin at the minimum charge weight and work up gradually. Never exceed maximum loads. Verify all data against a current published reloading manual before use. LoadDevelopment.com is not responsible for errors or omissions in this data.
Recipes
11
Powders
7
Bullet makers
1
Bullet weights
100–120 gr

Sample .257 Roberts (IMR Data) loads

The first 5 of 11 recipes.

BulletPowderChargeVelocityCOALPrimer
Sierra SP 100grIMR IMR-406439.5 gr2,945 fps——
Sierra SP 100grIMR IMR-435044.5 gr2,930 fps——
Sierra SP 100grIMR IMR-483146.5 gr2,950 fps——
Sierra SP 100grIMR IMR-489536.5 gr2,850 fps——
Sierra Hollow Point Boat Tail 120grIMR IMR-303133.0 gr2,635 fps——

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