Load Specifications
Load data in caliber .303 Savage with .308 | 152gr | Remington SP Extended-Range 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>> | 92% | 33,808 psi | 86% | 2192 fps | 96.5% |
| Accurate 2495ᴾ | <<locked>> | 100% | 31,575 psi | 81% | 2228 fps | 96.3% |
| ADI AR 2207 | <<locked>> | 82% | 34,809 psi | 89% | 2195 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 94% | 33,257 psi | 85% | 2244 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 88% | 34,867 psi | 89% | 2221 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,285 psi | 80% | 1440 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 35,418 psi | 90% | 2182 fps | 98.7% |
| Norma 200 | <<locked>> | 84% | 34,824 psi | 89% | 2208 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,966 psi | 79% | 1473 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 34,983 psi | 89% | 2165 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 33,968 psi | 87% | 2149 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 94% | 35,143 psi | 90% | 2182 fps | 96.6% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,185 psi | 87% | 2244 fps | 96.7% |
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% | 29,965 psi | 77% | 2106 fps | 95.1% |
| Accurate 2495 | <<locked>> | 98% | 29,269 psi | 75% | 2178 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 32,706 psi | 84% | 2152 fps | 99.8% |
| Alliant AR-Comp | 26.8 gr | 86% | 26,150 psi | 67% | 2064 fps | 95.8% |
| Alliant Reloder-10x | 24.4 gr | 80% | 27,369 psi | 70% | 2054 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,916 psi | 59% | 1283 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,646 psi | 76% | 2054 fps | 97.1% |
| Norma 200 | <<locked>> | 80% | 30,879 psi | 79% | 2126 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,800 psi | 58% | 1316 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 32,909 psi | 84% | 2126 fps | 100% |
| Vihtavuori N130 | 25 gr | 82% | 28,166 psi | 72% | 2024 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 90% | 31,357 psi | 80% | 2100 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 96% | 30,414 psi | 78% | 2159 fps | 95.2% |
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 .308 | 152gr | Remington SP Extended-Range. Alliant AR-Comp delivers the highest muzzle velocity at 2,244 fps; across all powders the maximum-charge window runs from 1,440 fps to 2,244 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 79–90 %, leaving at least 10 % headroom. The 152.0 gr projectile in 0.308" 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 .308 | 152gr | Remington SP Extended-Range 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.