Load Specifications
Load data in caliber .303 Savage with .308 | 110gr | Speer SSP bullet and 5 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>> | 88% | 34,867 psi | 89% | 2631 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,631 psi | 76% | 1729 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,051 psi | 74% | 1765 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 33,504 psi | 86% | 2392 fps | 100% |
| Vihtavuori N120 | <<locked>> | 88% | 35,172 psi | 90% | 2602 fps | 99.3% |
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% | 27,108 psi | 69% | 2428 fps | 95.9% |
| Hodgdon TrailBoss | 9.6 gr | 80% | 21,669 psi | 55% | 1545 fps | 100% |
| ReloadSwiss RS 14 | 9.8 gr | 80% | 21,335 psi | 54% | 1581 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 31,705 psi | 81% | 2352 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 27,470 psi | 70% | 2408 fps | 97.3% |
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 5 powders for .303 Savage loaded with the .308 | 110gr | Speer SSP. ADI AR 2207 delivers the highest muzzle velocity at 2,631 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,631 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 5 of the 5 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 .308 | 110gr | Speer SSP 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.