Load Specifications
Load data in caliber .303 Savage with .308 | 110gr | Barnes TSX FB bullet and 8 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Vihtavuori N120 and ReloadSwiss RS 14.
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>> | 92% | 34,940 psi | 89% | 2608 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,326 psi | 72% | 1680 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 33,460 psi | 85% | 2464 fps | 96.2% |
| Lovex S053 | <<locked>> | 84% | 34,330 psi | 88% | 2497 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,963 psi | 71% | 1726 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 34,113 psi | 87% | 2526 fps | 96.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 34,098 psi | 87% | 2385 fps | 100% |
| Vihtavuori N120 | <<locked>> | 92% | 35,375 psi | 90% | 2582 fps | 99% |
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 | 25.9 gr | 84% | 27,137 psi | 69% | 2408 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,581 psi | 53% | 1503 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 31,459 psi | 80% | 2418 fps | 95.4% |
| Lovex S053 | <<locked>> | 80% | 30,414 psi | 78% | 2405 fps | 98.4% |
| ReloadSwiss RS 14 | 9.1 gr | 80% | 20,189 psi | 52% | 1539 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 32,155 psi | 82% | 2480 fps | 95.5% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 28,877 psi | 74% | 2277 fps | 100% |
| Vihtavuori N120 | 24.7 gr | 80% | 24,424 psi | 62% | 2293 fps | 95.2% |
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 8 powders for .303 Savage loaded with the .308 | 110gr | Barnes TSX FB. ADI AR 2207 delivers the highest muzzle velocity at 2,608 fps; across all powders the maximum-charge window runs from 1,680 fps to 2,608 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 8 of the 8 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 71–90 %, leaving at least 10 % headroom. The 110.0 gr projectile in 0.308" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. 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. ADI AR 2207, Vihtavuori N120, ReloadSwiss RS 14 rank at the top here: for .303 Savage with the .308 | 110gr | Barnes TSX FB 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.