.257 Roberts (A-Square Data) Load Data

19 published .257 Roberts (A-Square Data) reloading recipes across 5 powders and 2 bullet manufacturers, with bullet weights from 87 to 100 grains and recorded velocities between 2,676 and 3,316 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
19
Powders
5
Bullet makers
2
Bullet weights
87–100 gr

Sample .257 Roberts (A-Square Data) loads

The first 5 of 19 recipes.

BulletPowderChargeVelocityCOALPrimer
Nosler Ballistic Tip 100grHodgdon H-483146.6 gr2676 fps——
Nosler Ballistic Tip 100grHodgdon H-483151.5 gr3046 fps——
Nosler Ballistic Tip 100grHodgdon H-483149.0 gr2865 fps——
Nosler Ballistic Tip 100grIMR IMR-483147.0 gr2953 fps——
Nosler Ballistic Tip 100grIMR IMR-483144.0 gr2752 fps——

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