Load Specifications
Load data in caliber .303 Savage with .311 | 125gr | Sierra Pro-Hunter bullet and 10 powders. The key underlying parameters are shown in the table above.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 84% | 34,127 psi | 87% | 2451 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 98% | 34,983 psi | 89% | 2536 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 90% | 34,098 psi | 87% | 2470 fps | 96.1% |
| Alliant Reloder-7 | <<locked>> | 82% | 33,895 psi | 87% | 2398 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,501 psi | 78% | 1627 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 34,824 psi | 89% | 2428 fps | 97.1% |
| Norma 200 | <<locked>> | 86% | 34,026 psi | 87% | 2454 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,008 psi | 77% | 1660 fps | 100% |
| Vihtavuori N120 | <<locked>> | 84% | 34,374 psi | 88% | 2425 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 92% | 35,215 psi | 90% | 2431 fps | 96% |
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 80% | 30,168 psi | 77% | 2359 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 94% | 30,879 psi | 79% | 2431 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 31,923 psi | 82% | 2418 fps | 95.3% |
| Alliant Reloder-7 | <<locked>> | 80% | 31,807 psi | 81% | 2349 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,278 psi | 57% | 1450 fps | 100% |
| IMR 4198 | <<locked>> | 82% | 29,602 psi | 76% | 2297 fps | 95.1% |
| Norma 200 | <<locked>> | 82% | 29,950 psi | 76% | 2356 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,046 psi | 56% | 1486 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 30,429 psi | 78% | 2336 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 90% | 33,040 psi | 84% | 2382 fps | 95.3% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 10 powders for .303 Savage loaded with the .311 | 125gr | Sierra Pro-Hunter. Alliant AR-Comp delivers the highest muzzle velocity at 2,536 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,536 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 10 of the 10 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.