42 published .257 Roberts Ackley Improved (Montana Rifle Co. Model 1999) reloading recipes across 16 powders and 5 bullet manufacturers, with bullet weights from 75 to 120 grains and recorded velocities between 2,814 and 3,572 fps. Every load lists charge weight, velocity, COAL, primer and case where the source published it.
The first 5 of 42 recipes.
| Bullet | Powder | Charge | Velocity | COAL | Primer |
|---|---|---|---|---|---|
| Sierra spitzer boat-tail 100gr | Accurate AAC-4350 | 48.0 gr | 3018 fps | 2.82 | Winchester Large Rifle |
| Sierra spitzer boat-tail 100gr | Hodgdon H-4831 | 53.5 gr | 3295 fps | 2.82 | Winchester Large Rifle |
| Swift Scirocco 100gr | Ramshot Hunter | 50.0 gr | 3233 fps | 2.86 | Winchester Large Rifle |
| Swift Scirocco 100gr | IMR IMR-4350 | 49.0 gr | 3262 fps | 2.86 | Winchester Large Rifle |
| Swift Scirocco 100gr | Alliant RL-15 | 42.0 gr | 3116 fps | 2.86 | Winchester Large Rifle |
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