Load Specifications
Load data in caliber .303 Savage with .310 | 155gr | Accurate Molds bullet and 16 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% | 33,591 psi | 86% | 2205 fps | 97.2% |
| Accurate 2495ᴾ | <<locked>> | 100% | 31,285 psi | 80% | 2241 fps | 97% |
| ADI AR 2207 | <<locked>> | 82% | 35,012 psi | 89% | 2211 fps | 100% |
| Alliant AR-Comp | <<locked>> | 94% | 33,417 psi | 85% | 2270 fps | 99.2% |
| Alliant Reloder-10x | <<locked>> | 88% | 34,708 psi | 89% | 2238 fps | 98.5% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 34,084 psi | 87% | 2146 fps | 95.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,719 psi | 78% | 1447 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 33,794 psi | 86% | 2280 fps | 96.1% |
| IMR 4198 | <<locked>> | 86% | 35,433 psi | 90% | 2201 fps | 99.2% |
| Norma 200 | <<locked>> | 84% | 34,476 psi | 88% | 2221 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,211 psi | 77% | 1480 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 33,968 psi | 87% | 2205 fps | 96.4% |
| Vihtavuori N120 | <<locked>> | 82% | 35,288 psi | 90% | 2182 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 33,765 psi | 86% | 2165 fps | 98% |
| Vihtavuori N133 | <<locked>> | 94% | 35,172 psi | 90% | 2201 fps | 97.3% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 34,577 psi | 88% | 2274 fps | 97.6% |
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 | 28.5 gr | 88% | 29,443 psi | 75% | 2116 fps | 95.7% |
| Accurate 2495 | <<locked>> | 96% | 26,803 psi | 68% | 2139 fps | 95.2% |
| ADI AR 2207 | <<locked>> | 80% | 32,895 psi | 84% | 2172 fps | 100% |
| Alliant AR-Comp | 27.5 gr | 84% | 24,105 psi | 62% | 2031 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 26,832 psi | 69% | 2060 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 31,952 psi | 82% | 2103 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,263 psi | 57% | 1286 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 31,850 psi | 81% | 2238 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 29,617 psi | 76% | 2077 fps | 97.8% |
| Norma 200 | <<locked>> | 80% | 29,921 psi | 76% | 2126 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,988 psi | 56% | 1319 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 31,705 psi | 81% | 2152 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 33,214 psi | 85% | 2146 fps | 100% |
| Vihtavuori N130 | 25.6 gr | 80% | 26,020 psi | 66% | 1991 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 88% | 29,254 psi | 75% | 2073 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 94% | 28,340 psi | 72% | 2133 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 16 powders for .303 Savage loaded with the .310 | 155gr | Accurate Molds . IMR 3031 delivers the highest muzzle velocity at 2,280 fps; across all powders the maximum-charge window runs from 1,447 fps to 2,280 fps. Accurate 2495 gives the best case fill at 100 %, and 16 of the 16 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. 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 .310 | 155gr | Accurate Molds 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.