Load Specifications
Load data in caliber .303 Savage with .3085 | 150gr | Prvi Partizan FSP bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Vihtavuori N130 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 |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 34,113 psi | 87% | 2221 fps | 96.6% |
| Accurate 2495ᴾ | <<locked>> | 100% | 32,068 psi | 82% | 2260 fps | 96.5% |
| ADI AR 2207 | <<locked>> | 82% | 35,317 psi | 90% | 2228 fps | 100% |
| Alliant AR-Comp | <<locked>> | 94% | 33,721 psi | 86% | 2280 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 35,215 psi | 90% | 2254 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,169 psi | 80% | 1460 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 33,866 psi | 86% | 2175 fps | 98.4% |
| Norma 200 | <<locked>> | 84% | 35,215 psi | 90% | 2241 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,850 psi | 79% | 1493 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 34,316 psi | 88% | 2182 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 94% | 35,360 psi | 90% | 2208 fps | 96.7% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,650 psi | 88% | 2277 fps | 96.9% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 22"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 30,313 psi | 77% | 2139 fps | 95.2% |
| Accurate 2495 | <<locked>> | 98% | 29,791 psi | 76% | 2211 fps | 95.7% |
| ADI AR 2207 | <<locked>> | 80% | 33,228 psi | 85% | 2188 fps | 99.8% |
| Alliant AR-Comp | 26.8 gr | 84% | 24,947 psi | 64% | 2051 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 27,528 psi | 70% | 2080 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,960 psi | 59% | 1302 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 30,153 psi | 77% | 2090 fps | 97.3% |
| Norma 200 | <<locked>> | 80% | 31,009 psi | 79% | 2152 fps | 97.6% |
| ReloadSwiss RS 14 | 9.1 gr | 80% | 22,858 psi | 58% | 1335 fps | 100% |
| Vihtavuori N130 | 25.6 gr | 82% | 28,558 psi | 73% | 2054 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 90% | 31,589 psi | 81% | 2129 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 96% | 30,879 psi | 79% | 2195 fps | 95.5% |
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 12 powders for .303 Savage loaded with the .3085 | 150gr | Prvi Partizan FSP. Alliant AR-Comp delivers the highest muzzle velocity at 2,280 fps; across all powders the maximum-charge window runs from 1,460 fps to 2,280 fps. Accurate 2495 gives the best case fill at 100 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 79–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.3085" calls for a 1:6.0 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, Vihtavuori N130, ReloadSwiss RS 14 rank at the top here: for .303 Savage with the .3085 | 150gr | Prvi Partizan FSP 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.