Load Specifications
Load data in caliber .303 Savage with .308 | 150gr | RWS Kegelspitz 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% | 33,620 psi | 86% | 2205 fps | 96.3% |
| Accurate 2495ᴾ | <<locked>> | 100% | 31,256 psi | 80% | 2238 fps | 96.1% |
| ADI AR 2207 | <<locked>> | 82% | 34,679 psi | 89% | 2211 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 96% | 35,331 psi | 90% | 2306 fps | 99% |
| Alliant Reloder-10x | <<locked>> | 88% | 34,708 psi | 89% | 2238 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,299 psi | 80% | 1457 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 35,317 psi | 90% | 2198 fps | 98.6% |
| Norma 200 | <<locked>> | 84% | 34,606 psi | 88% | 2221 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,980 psi | 79% | 1490 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 34,867 psi | 89% | 2182 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 33,823 psi | 86% | 2165 fps | 97.2% |
| Vihtavuori N133 | <<locked>> | 94% | 34,940 psi | 89% | 2192 fps | 96.4% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,243 psi | 87% | 2264 fps | 96.6% |
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% | 31,618 psi | 81% | 2162 fps | 95.6% |
| Accurate 2495 | <<locked>> | 98% | 29,254 psi | 75% | 2195 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 32,576 psi | 83% | 2169 fps | 99.7% |
| Alliant AR-Comp | 27.1 gr | 86% | 26,266 psi | 67% | 2083 fps | 95.7% |
| Alliant Reloder-10x | 24.5 gr | 80% | 26,977 psi | 69% | 2060 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,989 psi | 59% | 1299 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,631 psi | 76% | 2070 fps | 97% |
| Norma 200 | <<locked>> | 80% | 30,734 psi | 78% | 2139 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,524 psi | 58% | 1322 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 32,822 psi | 84% | 2142 fps | 100% |
| Vihtavuori N130 | 25.2 gr | 82% | 28,050 psi | 72% | 2037 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 90% | 31,169 psi | 80% | 2113 fps | 95% |
| Vihtavuori N135 | <<locked>> | 96% | 30,211 psi | 77% | 2172 fps | 95% |
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 | 150gr | RWS Kegelspitz. Alliant AR-Comp delivers the highest muzzle velocity at 2,306 fps; across all powders the maximum-charge window runs from 1,457 fps to 2,306 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 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, Alliant Reloder-10x, Vihtavuori N130 rank at the top here: for .303 Savage with the .308 | 150gr | RWS Kegelspitz 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.