Load Specifications
Load data in caliber .303 Savage with .308 | 150gr | RWS ID Classic 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, Accurate 2015 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% | 34,838 psi | 89% | 2241 fps | 96.9% |
| Accurate 2495ᴾ | <<locked>> | 100% | 32,401 psi | 83% | 2274 fps | 96.7% |
| Alliant AR-Comp | <<locked>> | 94% | 34,055 psi | 87% | 2293 fps | 98.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 33,649 psi | 86% | 2228 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,169 psi | 80% | 1463 fps | 100% |
| IMR 4198 | <<locked>> | 84% | 33,968 psi | 87% | 2182 fps | 98.5% |
| Norma 200 | <<locked>> | 82% | 33,649 psi | 86% | 2215 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,241 psi | 80% | 1503 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 34,418 psi | 88% | 2224 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 88% | 34,664 psi | 89% | 2195 fps | 97.7% |
| Vihtavuori N133 | <<locked>> | 92% | 33,765 psi | 86% | 2182 fps | 96.3% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,911 psi | 89% | 2290 fps | 97.1% |
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 | 28.1 gr | 88% | 30,690 psi | 78% | 2152 fps | 95.5% |
| Accurate 2495 | <<locked>> | 96% | 28,326 psi | 72% | 2182 fps | 95.2% |
| Alliant AR-Comp | 27.1 gr | 84% | 25,237 psi | 64% | 2067 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 27,920 psi | 71% | 2096 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,047 psi | 59% | 1309 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 30,284 psi | 77% | 2100 fps | 97.5% |
| Norma 200 | <<locked>> | 80% | 31,473 psi | 80% | 2169 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,945 psi | 59% | 1342 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 32,460 psi | 83% | 2182 fps | 95.1% |
| Vihtavuori N130 | 25.9 gr | 82% | 28,964 psi | 74% | 2070 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 90% | 31,908 psi | 81% | 2142 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 96% | 31,212 psi | 80% | 2208 fps | 95.8% |
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 | RWS ID Classic. Alliant AR-Comp delivers the highest muzzle velocity at 2,293 fps; across all powders the maximum-charge window runs from 1,463 fps to 2,293 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 80–89 %, leaving at least 11 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:16.0 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, Accurate 2015, Vihtavuori N130 rank at the top here: for .303 Savage with the .308 | 150gr | RWS ID Classic 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.