Load Specifications
Load data in caliber .303 Savage with .308 | 150gr | Woodleigh PP SN bullet and 13 powders. The key underlying parameters are shown in the table above.
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% | 34,360 psi | 88% | 2205 fps | 96.3% |
| ADI AR 2207 | <<locked>> | 82% | 33,808 psi | 86% | 2182 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 96% | 34,330 psi | 88% | 2267 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 88% | 33,634 psi | 86% | 2201 fps | 97.3% |
| Alliant Reloder-7 | <<locked>> | 82% | 35,346 psi | 90% | 2175 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,821 psi | 79% | 1434 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 34,301 psi | 88% | 2162 fps | 98.2% |
| Norma 200 | <<locked>> | 84% | 33,504 psi | 86% | 2188 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,487 psi | 78% | 1470 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 33,997 psi | 87% | 2156 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 34,534 psi | 88% | 2165 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 94% | 33,837 psi | 86% | 2156 fps | 95.7% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 32,909 psi | 84% | 2218 fps | 95.8% |
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 32,314 psi | 83% | 2165 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 31,720 psi | 81% | 2139 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 88% | 26,803 psi | 68% | 2083 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 82% | 27,920 psi | 71% | 2073 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 33,257 psi | 85% | 2133 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,713 psi | 58% | 1283 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 28,921 psi | 74% | 2041 fps | 96.4% |
| Norma 200 | <<locked>> | 80% | 29,689 psi | 76% | 2103 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,582 psi | 58% | 1316 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 31,966 psi | 82% | 2113 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 28,819 psi | 74% | 2041 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 92% | 31,937 psi | 82% | 2116 fps | 95% |
| Vihtavuori N135 | <<locked>> | 98% | 30,980 psi | 79% | 2175 fps | 95% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 35 powders for .303 Savage loaded with the .308 | 150gr | Woodleigh PP SN. IMR 3031 delivers the highest muzzle velocity at 2,270 fps; across all powders the maximum-charge window runs from 1,434 fps to 2,270 fps. Accurate 2495 gives the best case fill at 100 %, and 35 of the 35 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 76–90 %, 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. Accurate 2495, Hodgdon TrailBoss, Lovex D073.6 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. As outliers, Accurate 2460, Accurate 2520, Accurate LT-30 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.