.257 Weatherby Magnum (Handloader issue #339) Load Data

20 published .257 Weatherby Magnum (Handloader issue #339) reloading recipes across 4 powders and 5 bullet manufacturers, with bullet weights from 100 to 120 grains and recorded velocities between 3,095 and 3,560 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
20
Powders
4
Bullet makers
5
Bullet weights
100–120 gr

Sample .257 Weatherby Magnum (Handloader issue #339) loads

The first 5 of 20 recipes.

BulletPowderChargeVelocityCOALPrimer
Nosler E-Tip 100grHodgdon H-100076.0 gr3549 fps3.327CCI 250
Swift Scirocco II 100grHodgdon H-100076.0 gr3523 fps3.335CCI 250
Hammer Hunter 100grHodgdon H-100076.0 gr3495 fps3.306CCI 250
Nosler E-Tip 100grHodgdon H-100076.0 gr3560 fps3.327CCI 250
Nosler E-Tip 100grRamshot LRT80.0 gr3349 fps3.327CCI 250

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