Load Specifications
Load data in caliber .303 Savage with .308 | 150gr | Speer Soft Point bullet and 24 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% | 34,635 psi | 88% | 2215 fps | 96.4% |
| Accurate 2015 | <<locked>> | 92% | 34,389 psi | 88% | 2224 fps | 96.7% |
| Accurate 2495ᴾ | <<locked>> | 100% | 32,010 psi | 82% | 2260 fps | 96.5% |
| ADI AR 2207 | <<locked>> | 82% | 33,808 psi | 86% | 2185 fps | 99.8% |
| ADI AR 2207 | <<locked>> | 82% | 35,273 psi | 90% | 2228 fps | 100% |
| Alliant AR-Comp | <<locked>> | 96% | 34,534 psi | 88% | 2277 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 94% | 33,707 psi | 86% | 2280 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 33,968 psi | 87% | 2211 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 88% | 35,215 psi | 90% | 2254 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,966 psi | 79% | 1440 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,140 psi | 80% | 1460 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 34,592 psi | 88% | 2172 fps | 98.3% |
| IMR 4198 | <<locked>> | 84% | 33,837 psi | 86% | 2175 fps | 98.4% |
| Norma 200 | <<locked>> | 84% | 33,837 psi | 86% | 2198 fps | 98.1% |
| Norma 200 | <<locked>> | 84% | 35,172 psi | 90% | 2241 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,632 psi | 78% | 1473 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,821 psi | 79% | 1493 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 34,026 psi | 87% | 2159 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 34,838 psi | 89% | 2175 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 88% | 34,272 psi | 88% | 2182 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 94% | 34,069 psi | 87% | 2165 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 92% | 33,388 psi | 85% | 2169 fps | 96% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 33,141 psi | 85% | 2228 fps | 96% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,606 psi | 88% | 2277 fps | 96.9% |
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 90% | 30,676 psi | 78% | 2129 fps | 95% |
| Accurate 2015 | <<locked>> | 88% | 30,269 psi | 77% | 2139 fps | 95.2% |
| Accurate 2495 | <<locked>> | 98% | 30,066 psi | 77% | 2218 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 80% | 31,705 psi | 81% | 2142 fps | 99.6% |
| ADI AR 2207 | <<locked>> | 80% | 33,199 psi | 85% | 2188 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 88% | 27,035 psi | 69% | 2093 fps | 95.8% |
| Alliant AR-Comp | <<locked>> | 84% | 24,947 psi | 64% | 2051 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 82% | 28,210 psi | 72% | 2083 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 27,470 psi | 70% | 2080 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,887 psi | 58% | 1289 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,960 psi | 59% | 1302 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,196 psi | 75% | 2051 fps | 96.6% |
| IMR 4198 | <<locked>> | 80% | 30,139 psi | 77% | 2090 fps | 97.3% |
| Norma 200 | <<locked>> | 80% | 29,675 psi | 76% | 2106 fps | 96.9% |
| Norma 200 | <<locked>> | 80% | 31,009 psi | 79% | 2152 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,408 psi | 57% | 1312 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,829 psi | 58% | 1335 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 31,952 psi | 82% | 2116 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 29,066 psi | 74% | 2051 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 82% | 28,558 psi | 73% | 2054 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 92% | 32,184 psi | 82% | 2123 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 90% | 31,517 psi | 80% | 2129 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 98% | 31,256 psi | 80% | 2185 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 96% | 30,879 psi | 79% | 2195 fps | 95.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 24 powders for .303 Savage loaded with the .308 | 150gr | Speer Soft Point. Alliant AR-Comp delivers the highest muzzle velocity at 2,280 fps; across all powders the maximum-charge window runs from 1,440 fps to 2,280 fps. Accurate 2495 gives the best case fill at 100 %, and 24 of the 24 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 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, Hodgdon TrailBoss, Hodgdon TrailBoss 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.