Load Specifications
Load data in caliber .303 Savage with .308 | 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% | 34,374 psi | 88% | 2228 fps | 96.7% |
| Accurate 2495ᴾ | <<locked>> | 100% | 31,966 psi | 82% | 2260 fps | 96.5% |
| ADI AR 2207 | <<locked>> | 82% | 35,259 psi | 90% | 2228 fps | 100% |
| Alliant AR-Comp | <<locked>> | 94% | 33,678 psi | 86% | 2280 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 35,201 psi | 90% | 2254 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,125 psi | 79% | 1457 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 33,823 psi | 86% | 2175 fps | 98.4% |
| Norma 200 | <<locked>> | 84% | 35,143 psi | 90% | 2241 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,806 psi | 79% | 1493 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 34,243 psi | 87% | 2182 fps | 97.5% |
| Vihtavuori N133 | <<locked>> | 92% | 33,359 psi | 85% | 2169 fps | 96% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,577 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% | 30,255 psi | 77% | 2139 fps | 95.2% |
| Accurate 2495 | <<locked>> | 98% | 30,037 psi | 77% | 2218 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 80% | 33,170 psi | 85% | 2188 fps | 99.8% |
| Alliant AR-Comp | 26.8 gr | 84% | 24,918 psi | 64% | 2051 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 27,499 psi | 70% | 2080 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,945 psi | 59% | 1302 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 30,110 psi | 77% | 2090 fps | 97.3% |
| Norma 200 | <<locked>> | 80% | 30,980 psi | 79% | 2152 fps | 97.6% |
| ReloadSwiss RS 14 | 9.1 gr | 80% | 22,843 psi | 58% | 1335 fps | 100% |
| Vihtavuori N130 | 25.6 gr | 82% | 28,543 psi | 73% | 2054 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 90% | 31,560 psi | 81% | 2129 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 96% | 30,850 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 .308 | 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 1,457 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 0.308" 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 .308 | 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.