10 published .257 Roberts in a 24-inch Barrel reloading recipes across 4 powders, with bullet weights from 90 to 120 grains and recorded velocities between 2,740 and 3,200 fps. Every load lists charge weight, velocity, COAL, primer and case where the source published it.
The first 5 of 10 recipes.
| Bullet | Powder | Charge | Velocity | COAL | Primer |
|---|---|---|---|---|---|
| 100gr | IMR IMR-4064 | 40.0 gr | 2,950 fps | — | — |
| 100gr | IMR IMR-4350 | 45.0 gr | 2,970 fps | — | — |
| 100gr | IMR IMR-4831 | 48.0 gr | 3,040 fps | — | — |
| 100gr | Winchester W-760 | 45.0 gr | 2,970 fps | — | — |
| 120gr | IMR IMR-4064 | 38.0 gr | 2,750 fps | — | — |
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