.257 Weatherby Magnum (Swift Data) Load Data

16 published .257 Weatherby Magnum (Swift Data) reloading recipes across 4 powders and 1 bullet manufacturers, with bullet weights from 100 to 120 grains and recorded velocities between 2,900 and 3,481 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
16
Powders
4
Bullet makers
1
Bullet weights
100–120 gr

Sample .257 Weatherby Magnum (Swift Data) loads

The first 5 of 16 recipes.

BulletPowderChargeVelocityCOALPrimer
Swift A-Frame 100grHodgdon H-100075.5 gr3,360 fps——
Swift A-Frame 100grHodgdon H-100071.5 gr3,098 fps——
Swift A-Frame 100grIMR IMR-782866.5 gr3,128 fps——
Swift A-Frame 100grIMR IMR-782870.5 gr3,428 fps——
Swift A-Frame 100grAlliant RL-2268.5 gr3,239 fps——

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