Load Specifications
Load data in caliber .303 Savage with .308 | 150gr | Woodleigh HS bullet and 11 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Alliant Reloder-10x and Vihtavuori N130.
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 |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 94% | 34,229 psi | 87% | 2198 fps | 96.2% |
| ADI AR 2207 | <<locked>> | 84% | 35,346 psi | 90% | 2208 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 96% | 33,881 psi | 87% | 2254 fps | 98.4% |
| Alliant Reloder-10x | <<locked>> | 90% | 35,215 psi | 90% | 2231 fps | 97.7% |
| Alliant Reloder-7 | <<locked>> | 82% | 35,128 psi | 90% | 2165 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,748 psi | 79% | 1430 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 34,098 psi | 87% | 2152 fps | 98.1% |
| Norma 200 | <<locked>> | 86% | 35,375 psi | 90% | 2221 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,414 psi | 78% | 1463 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 33,446 psi | 85% | 2139 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 34,389 psi | 88% | 2159 fps | 97.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 32,198 psi | 82% | 2156 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 31,473 psi | 80% | 2133 fps | 99.5% |
| Alliant AR-Comp | 26.6 gr | 88% | 26,716 psi | 68% | 2077 fps | 95.4% |
| Alliant Reloder-10x | 24.2 gr | 82% | 27,717 psi | 71% | 2064 fps | 95% |
| Alliant Reloder-7 | <<locked>> | 80% | 33,054 psi | 84% | 2126 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,582 psi | 58% | 1276 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 28,689 psi | 73% | 2031 fps | 96.2% |
| Norma 200 | <<locked>> | 80% | 29,167 psi | 74% | 2087 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,452 psi | 57% | 1309 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 31,705 psi | 81% | 2106 fps | 99.9% |
| Vihtavuori N130 | 24.8 gr | 84% | 28,660 psi | 73% | 2034 fps | 95% |
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 11 powders for .303 Savage loaded with the .308 | 150gr | Woodleigh HS. Alliant AR-Comp delivers the highest muzzle velocity at 2,254 fps; across all powders the maximum-charge window runs from 1,430 fps to 2,254 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 11 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 78–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:15.5 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. Alliant AR-Comp, Alliant Reloder-10x, Vihtavuori N130 rank at the top here: for .303 Savage with the .308 | 150gr | Woodleigh HS 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.