Load Specifications
Load data in caliber .303 Savage with .308 | 123gr | Prvi Partizan FMJ 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% | 33,736 psi | 86% | 2441 fps | 98.8% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 34,490 psi | 88% | 2510 fps | 96.4% |
| Alliant Reloder-7 | <<locked>> | 84% | 33,707 psi | 86% | 2388 fps | 95.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,994 psi | 77% | 1611 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 34,795 psi | 89% | 2418 fps | 96.4% |
| Norma 200 | <<locked>> | 88% | 33,446 psi | 85% | 2438 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,472 psi | 75% | 1647 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 34,519 psi | 88% | 2247 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 34,055 psi | 87% | 2415 fps | 99.6% |
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% | 27,920 psi | 71% | 2300 fps | 97.2% |
| Alliant AR-Comp | <<locked>> | 98% | 32,648 psi | 83% | 2464 fps | 95.7% |
| Alliant Reloder-7 | <<locked>> | 82% | 31,807 psi | 81% | 2346 fps | 95% |
| Hodgdon TrailBoss | 9 gr | 80% | 21,814 psi | 56% | 1434 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 32,895 psi | 84% | 2372 fps | 95.7% |
| Norma 200 | <<locked>> | 86% | 31,575 psi | 81% | 2395 fps | 95.4% |
| ReloadSwiss RS 14 | 9.2 gr | 80% | 21,567 psi | 55% | 1470 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 32,851 psi | 84% | 2218 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 28,268 psi | 72% | 2277 fps | 98.4% |
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 .308 | 123gr | Prvi Partizan FMJ. Alliant AR-Comp delivers the highest muzzle velocity at 2,510 fps; across all powders the maximum-charge window runs from 1,611 fps to 2,510 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 75–89 %, leaving at least 11 % headroom. The 123.0 gr projectile in 0.308" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. 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 .308 | 123gr | Prvi Partizan FMJ 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.