Load Specifications
Load data in caliber .303 Savage with .307 | 110gr | Prvi Partizan SP RN bullet and 6 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% | 33,301 psi | 85% | 2602 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,733 psi | 76% | 1739 fps | 100% |
| Norma 200 | <<locked>> | 90% | 35,259 psi | 90% | 2648 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,153 psi | 74% | 1775 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 34,272 psi | 88% | 2415 fps | 100% |
| Vihtavuori N120 | <<locked>> | 86% | 33,576 psi | 86% | 2575 fps | 99.1% |
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% | 27,702 psi | 71% | 2451 fps | 96.3% |
| Hodgdon TrailBoss | 9.8 gr | 80% | 21,872 psi | 56% | 1555 fps | 100% |
| Norma 200 | <<locked>> | 88% | 33,069 psi | 84% | 2595 fps | 95.1% |
| ReloadSwiss RS 14 | 9.9 gr | 80% | 21,248 psi | 54% | 1585 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 32,430 psi | 83% | 2375 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 28,050 psi | 72% | 2431 fps | 97.6% |
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 6 powders for .303 Savage loaded with the .307 | 110gr | Prvi Partizan SP RN. Norma 200 delivers the highest muzzle velocity at 2,648 fps; across all powders the maximum-charge window runs from 1,739 fps to 2,648 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 6 of the 6 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 74–90 %, 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .303 Savage with the .307 | 110gr | Prvi Partizan SP RN 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.