Load Specifications
Load data in caliber .303 Savage with .31 | 123gr | Prvi Partizan PSP bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are 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% | 34,301 psi | 88% | 2457 fps | 99% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 34,795 psi | 89% | 2523 fps | 96.7% |
| Alliant Reloder-7 | <<locked>> | 84% | 34,142 psi | 87% | 2402 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,037 psi | 77% | 1614 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 35,244 psi | 90% | 2431 fps | 96.6% |
| Norma 200 | <<locked>> | 88% | 33,852 psi | 86% | 2454 fps | 96.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,530 psi | 75% | 1650 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 35,056 psi | 90% | 2260 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 34,519 psi | 88% | 2431 fps | 99.7% |
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% | 28,413 psi | 73% | 2316 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 98% | 32,967 psi | 84% | 2477 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 82% | 32,010 psi | 82% | 2352 fps | 95.2% |
| Hodgdon TrailBoss | 9.1 gr | 80% | 21,915 psi | 56% | 1440 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 31,502 psi | 80% | 2343 fps | 95.2% |
| Norma 200 | <<locked>> | 86% | 31,691 psi | 81% | 2402 fps | 95.5% |
| ReloadSwiss RS 14 | 9.3 gr | 80% | 21,669 psi | 55% | 1476 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 33,069 psi | 84% | 2224 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 28,718 psi | 73% | 2293 fps | 98.6% |
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 .31 | 123gr | Prvi Partizan PSP. Alliant AR-Comp delivers the highest muzzle velocity at 2,523 fps; across all powders the maximum-charge window runs from 1,614 fps to 2,523 fps. Alliant AR-Comp 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 75–90 %, leaving at least 10 % headroom. Alliant AR-Comp, 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .303 Savage with the .31 | 123gr | Prvi Partizan PSP 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.