Load Specifications
Load data in caliber .303 Savage with .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC bullet and 11 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% | 34,272 psi | 88% | 2201 fps | 96.2% |
| ADI AR 2207 | <<locked>> | 82% | 33,634 psi | 86% | 2178 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 96% | 34,185 psi | 87% | 2264 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 88% | 33,489 psi | 86% | 2198 fps | 97.3% |
| Alliant Reloder-7 | <<locked>> | 82% | 35,186 psi | 90% | 2169 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,951 psi | 79% | 1437 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 34,185 psi | 87% | 2159 fps | 98.1% |
| Norma 200 | <<locked>> | 84% | 33,359 psi | 85% | 2182 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,618 psi | 78% | 1470 fps | 100% |
| Vihtavuori N120 | <<locked>> | 82% | 33,881 psi | 87% | 2149 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 34,418 psi | 88% | 2162 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 | <<locked>> | 92% | 32,213 psi | 82% | 2159 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 31,546 psi | 81% | 2136 fps | 99.5% |
| Alliant AR-Comp | 26.7 gr | 88% | 26,716 psi | 68% | 2080 fps | 95.5% |
| Alliant Reloder-10x | 24.3 gr | 82% | 27,760 psi | 71% | 2067 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 80% | 33,141 psi | 85% | 2129 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,800 psi | 58% | 1283 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 28,761 psi | 73% | 2034 fps | 96.3% |
| Norma 200 | <<locked>> | 80% | 29,530 psi | 75% | 2100 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,321 psi | 57% | 1309 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 31,792 psi | 81% | 2110 fps | 99.9% |
| Vihtavuori N130 | 24.9 gr | 84% | 28,718 psi | 73% | 2037 fps | 95.1% |
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 35 powders for .303 Savage loaded with the .308 | 150gr | Alaska Bullet Works Kodiak SP SPBC. IMR 3031 delivers the highest muzzle velocity at 2,267 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,267 fps. Accurate 2495 gives the best case fill at 100 %, and 35 of the 35 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 150.0 gr projectile in 0.308" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Hodgdon TrailBoss, Lovex D073.6 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 | Alaska Bullet Works Kodiak SP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2460, Accurate 2520, Accurate LT-30 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.