Load Specifications
Load data in caliber .303 Savage with .308 | 146gr | Reichenberg Spezial Jagd 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, 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% | 33,243 psi | 85% | 2234 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 84% | 34,664 psi | 89% | 2251 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 98% | 35,317 psi | 90% | 2343 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 90% | 34,490 psi | 88% | 2274 fps | 97.5% |
| Alliant Reloder-7 | <<locked>> | 82% | 34,272 psi | 88% | 2205 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,400 psi | 78% | 1467 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 33,562 psi | 86% | 2198 fps | 97.9% |
| Norma 200 | <<locked>> | 86% | 34,461 psi | 88% | 2260 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,950 psi | 76% | 1499 fps | 100% |
| Vihtavuori N120 | <<locked>> | 84% | 34,911 psi | 89% | 2221 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 33,721 psi | 86% | 2198 fps | 96.9% |
| Vihtavuori N133 | <<locked>> | 96% | 35,012 psi | 89% | 2228 fps | 96% |
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>> | 92% | 31,270 psi | 80% | 2192 fps | 95.1% |
| ADI AR 2207 | <<locked>> | 80% | 30,516 psi | 78% | 2165 fps | 99.3% |
| Alliant AR-Comp | 27.6 gr | 88% | 25,991 psi | 66% | 2110 fps | 95% |
| Alliant Reloder-10x | 25.7 gr | 84% | 28,645 psi | 73% | 2142 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 80% | 32,271 psi | 82% | 2165 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,118 psi | 56% | 1306 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 28,021 psi | 72% | 2067 fps | 96% |
| Norma 200 | <<locked>> | 80% | 28,369 psi | 72% | 2126 fps | 96.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,901 psi | 56% | 1339 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 30,763 psi | 79% | 2142 fps | 99.8% |
| Vihtavuori N130 | 26.4 gr | 86% | 29,892 psi | 76% | 2116 fps | 95.6% |
| Vihtavuori N133 | <<locked>> | 94% | 32,996 psi | 84% | 2188 fps | 95.3% |
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 | 146gr | Reichenberg Spezial Jagd. Alliant AR-Comp delivers the highest muzzle velocity at 2,343 fps; across all powders the maximum-charge window runs from 1,467 fps to 2,343 fps. Hodgdon TrailBoss 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 76–90 %, leaving at least 10 % headroom. The 146.0 gr projectile in 0.308" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. 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 | 146gr | Reichenberg Spezial Jagd 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.