.257 Magnum revolver Load Data

14 published .257 Magnum revolver reloading recipes across 7 powders and 2 bullet manufacturers, with bullet weights from 60 to 67 grains and recorded velocities between 988 and 1,603 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
14
Powders
7
Bullet makers
2
Bullet weights
60–67 gr

Sample .257 Magnum revolver loads

The first 5 of 14 recipes.

BulletPowderChargeVelocityCOALPrimer
Hornady Hornady 60grAlliant 24006.4 gr988 fps——
Speer Speer 60grAlliant Blue Dot6.7 gr1,323 fps——
Speer Speer 60grAlliant Bullseye4.8 gr1,187 fps——
Speer Speer 60grIMR IMR-42279.3 gr1,441 fps——
Hornady Hornady 60grAlliant Unique4.1 gr1,098 fps——

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