Load Specifications
Load data in caliber .303 Savage with .311 | 150gr | Norma Semi Soft Point bullet and 13 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% | 35,041 psi | 89% | 2228 fps | 96.7% |
| Accurate 2495ᴾ | <<locked>> | 100% | 30,690 psi | 78% | 2221 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 82% | 34,316 psi | 88% | 2198 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 96% | 34,867 psi | 89% | 2290 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 34,026 psi | 87% | 2218 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,980 psi | 79% | 1444 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 34,737 psi | 89% | 2178 fps | 98.4% |
| Norma 200 | <<locked>> | 84% | 34,287 psi | 88% | 2211 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,661 psi | 78% | 1480 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 34,519 psi | 88% | 2172 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 35,244 psi | 90% | 2188 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 94% | 34,418 psi | 88% | 2175 fps | 96.1% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 33,460 psi | 85% | 2238 fps | 96.2% |
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>> | 90% | 31,067 psi | 79% | 2142 fps | 95.3% |
| Accurate 2495 | <<locked>> | 98% | 28,761 psi | 73% | 2178 fps | 95% |
| ADI AR 2207 | <<locked>> | 80% | 32,227 psi | 82% | 2159 fps | 99.7% |
| Alliant AR-Comp | 26.7 gr | 86% | 25,788 psi | 66% | 2064 fps | 95.2% |
| Alliant Reloder-10x | 24.8 gr | 82% | 28,355 psi | 72% | 2090 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,626 psi | 58% | 1286 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,327 psi | 75% | 2057 fps | 96.7% |
| Norma 200 | <<locked>> | 80% | 30,124 psi | 77% | 2119 fps | 97.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,495 psi | 57% | 1319 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 32,460 psi | 83% | 2129 fps | 100% |
| Vihtavuori N130 | 25.5 gr | 84% | 29,515 psi | 75% | 2067 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 92% | 32,532 psi | 83% | 2136 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 98% | 31,546 psi | 81% | 2198 fps | 95.4% |
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 13 powders for .303 Savage loaded with the .311 | 150gr | Norma Semi Soft Point. Alliant AR-Comp delivers the highest muzzle velocity at 2,290 fps; across all powders the maximum-charge window runs from 1,444 fps to 2,290 fps. Accurate 2495 gives the best case fill at 100 %, and 13 of the 13 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 0.311" calls for a 1:17.0 twist; slower twists will usually not stabilise this weight. Accurate 2495, 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 .311 | 150gr | Norma Semi Soft 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.