.257 Roberts +P (Speer Reloading Manual #14) Load Data

116 published .257 Roberts +P (Speer Reloading Manual #14) reloading recipes across 20 powders and 1 bullet manufacturers, with bullet weights from 75 to 120 grains and recorded velocities between 1,728 and 3,413 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
116
Powders
20
Bullet makers
1
Bullet weights
75–120 gr

Sample .257 Roberts +P (Speer Reloading Manual #14) loads

The first 5 of 116 recipes.

BulletPowderChargeVelocityCOALPrimer
Speer Spitz SP, HP or Spitz BTSP 100grAccurate AAC-270041.0 gr2807 fps
Speer Spitz SP, HP or Spitz BTSP 100grAccurate AAC-270037.0 gr2529 fps
Speer Spitz SP, HP or Spitz BTSP 100grHodgdon H-38038.0 gr2566 fps
Speer Spitz SP, HP or Spitz BTSP 100grHodgdon H-38042.0 gr2842 fps
Speer Spitz SP, HP or Spitz BTSP 100grHodgdon H-41440.0 gr2657 fps

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