.257 Roberts Improved (RCBS Version) Load Data

49 published .257 Roberts Improved (RCBS Version) reloading recipes across 11 powders and 4 bullet manufacturers, with bullet weights from 75 to 120 grains and recorded velocities between 2,728 and 3,419 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
49
Powders
11
Bullet makers
4
Bullet weights
75–120 gr

Sample .257 Roberts Improved (RCBS Version) loads

The first 5 of 49 recipes.

BulletPowderChargeVelocityCOALPrimer
Sierra spitzer 100grHodgdon H-435051.0 gr2,944 fps
Hornady SP 100grHodgdon H-483153.0 gr3,015 fps
Speer HP 100grHodgdon H-483153.0 gr3,081 fps
Nosler SB 100grHodgdon H-483154.0 gr3,097 fps
Nosler Partition 100grHodgdon H-483152.0 gr2,906 fps

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