Load Specifications
Load data in caliber .303 Savage with .308 | 110gr | Winchester Hollow Point 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% | 35,056 psi | 90% | 2592 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,877 psi | 74% | 1673 fps | 100% |
| IMR 4227 | <<locked>> | 82% | 33,605 psi | 86% | 2448 fps | 96% |
| Lovex S053 | <<locked>> | 84% | 34,577 psi | 88% | 2480 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,253 psi | 72% | 1713 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 84% | 34,476 psi | 88% | 2513 fps | 96.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 34,534 psi | 88% | 2375 fps | 100% |
| Vihtavuori N120 | <<locked>> | 92% | 35,433 psi | 90% | 2566 fps | 98.9% |
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 | 25.3 gr | 84% | 27,543 psi | 70% | 2398 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,002 psi | 54% | 1493 fps | 100% |
| IMR 4227 | <<locked>> | 80% | 31,633 psi | 81% | 2398 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 30,676 psi | 78% | 2388 fps | 98.3% |
| ReloadSwiss RS 14 | 8.9 gr | 80% | 20,668 psi | 53% | 1529 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 82% | 32,198 psi | 82% | 2461 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,283 psi | 75% | 2264 fps | 100% |
| Vihtavuori N120 | 24.1 gr | 80% | 24,831 psi | 63% | 2283 fps | 95.1% |
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 | Winchester Hollow Point. ADI AR 2207 delivers the highest muzzle velocity at 2,592 fps; across all powders the maximum-charge window runs from 1,673 fps to 2,592 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 72–90 %, leaving at least 10 % headroom. The 110.0 gr projectile in 0.308" calls for a 1:14.5 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 | Winchester Hollow Point 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.