40 published .257 Roberts Improved Data reloading recipes across 11 powders and 3 bullet manufacturers, with bullet weights from 60 to 125 grains and recorded velocities between 2,272 and 3,997 fps. Every load lists charge weight, velocity, COAL, primer and case where the source published it.
The first 5 of 40 recipes.
| Bullet | Powder | Charge | Velocity | COAL | Primer |
|---|---|---|---|---|---|
| Sierra Sierra 100gr | Hodgdon H-380 | 44.0 gr | 3,065 fps | — | — |
| Sierra Sierra 100gr | Hodgdon H-414 | 52.0 gr | 3,280 fps | — | — |
| Sierra Sierra 100gr | Hodgdon H-414 | 50.0 gr | 3,205 fps | — | — |
| Sierra Sierra 100gr | IMR IMR-4064 | 46.0 gr | 3,239 fps | — | — |
| Hornady Spire Point 100gr | IMR IMR-4227 | 27.0 gr | 2,534 fps | — | — |
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