257 Roberts +P Load Data

96 published 257 Roberts +P reloading recipes across 20 powders and 9 bullet manufacturers, with bullet weights from 75 to 120 grains and recorded velocities between 2,347 and 3,610 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
96
Powders
20
Bullet makers
9
Bullet weights
75–120 gr

Sample 257 Roberts +P loads

The first 5 of 96 recipes.

BulletPowderChargeVelocityCOALPrimer
Barnes TSX 100grAccurate ACCURATE 252033.3–37.0 gr2475.0–2813 fps2.760Federal 210
Nosler Ballistic Tip 100grAccurate ACCURATE 252033.8–37.5 gr2525.0–2869 fps2.775Federal 210
Barnes TSX 100grAccurate ACCURATE 270039.0–41.0 gr2640.0–2808 fps2.760Federal 210
Nosler Ballistic Tip 100grAccurate ACCURATE 270040.9–43.0 gr2761.0–2937 fps2.775Federal 210
Barnes TSX 100grAccurate ACCURATE 406435.1–39.0 gr2533.0–2879 fps2.760Federal 210

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