Load Specifications
Load data in caliber .303 Savage with .311 | 125gr | Speer Spitzer Soft Point bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma 200, ReloadSwiss RS 14 and Hodgdon TrailBoss.
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>> | 86% | 35,128 psi | 90% | 2457 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 98% | 33,634 psi | 86% | 2480 fps | 96.5% |
| Alliant Reloder-10x | <<locked>> | 92% | 34,563 psi | 88% | 2464 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 84% | 34,925 psi | 89% | 2405 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,298 psi | 77% | 1608 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 33,982 psi | 87% | 2388 fps | 96.5% |
| Norma 200 | <<locked>> | 88% | 34,737 psi | 89% | 2454 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,805 psi | 76% | 1644 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 35,360 psi | 90% | 2431 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 80% | 28,834 psi | 74% | 2310 fps | 97.8% |
| Alliant AR-Comp | <<locked>> | 96% | 31,546 psi | 81% | 2428 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 90% | 32,590 psi | 83% | 2418 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 82% | 32,706 psi | 84% | 2356 fps | 95.8% |
| Hodgdon TrailBoss | 9.2 gr | 80% | 22,176 psi | 57% | 1434 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 31,908 psi | 81% | 2336 fps | 95.7% |
| Norma 200 | 28 gr | 84% | 30,705 psi | 78% | 2362 fps | 95.4% |
| ReloadSwiss RS 14 | 9.4 gr | 80% | 21,944 psi | 56% | 1470 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 29,138 psi | 74% | 2290 fps | 98.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 9 powders for .303 Savage loaded with the .311 | 125gr | Speer Spitzer Soft Point. Alliant AR-Comp delivers the highest muzzle velocity at 2,480 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,480 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 9 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 76–90 %, 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. Norma 200, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .303 Savage with the .311 | 125gr | Speer Spitzer Soft Point they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.