Load Specifications
Load data in caliber .303 Savage with .310 | 108gr | Barnes RRLP bullet and 7 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 SNPE Vectan BA6 1/2.
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% | 33,953 psi | 87% | 2579 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,427 psi | 73% | 1677 fps | 100% |
| IMR 4227 | <<locked>> | 84% | 34,664 psi | 89% | 2487 fps | 95.9% |
| Lovex S053 | <<locked>> | 84% | 33,475 psi | 85% | 2470 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,818 psi | 71% | 1716 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 33,402 psi | 85% | 2372 fps | 100% |
| Vihtavuori N120 | <<locked>> | 92% | 34,360 psi | 88% | 2556 fps | 98.4% |
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 | 25.6 gr | 86% | 28,572 psi | 73% | 2441 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,871 psi | 53% | 1503 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 32,880 psi | 84% | 2444 fps | 95.3% |
| Lovex S053 | <<locked>> | 80% | 29,907 psi | 76% | 2382 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,218 psi | 52% | 1529 fps | 100% |
| SNPE Vectan BA6 1/2 | 20.9 gr | 80% | 28,558 psi | 73% | 2264 fps | 100% |
| Vihtavuori N120 | 24.4 gr | 82% | 25,744 psi | 66% | 2323 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 7 powders for .303 Savage loaded with the .310 | 108gr | Barnes RRLP. ADI AR 2207 delivers the highest muzzle velocity at 2,579 fps; across all powders the maximum-charge window runs from 1,677 fps to 2,579 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 7 of the 7 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 71–89 %, leaving at least 11 % headroom. The 108.0 gr projectile in 0.31" calls for a 1:14.0 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, SNPE Vectan BA6 1/2 rank at the top here: for .303 Savage with the .310 | 108gr | Barnes RRLP 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.