Load Specifications
Load data in caliber .375 SOCOM with .375 | 300gr | A-Square LionLoad bullet and 7 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 2495, Vihtavuori N135 and ReloadSwiss RS 14.
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: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 31,241 psi | 89% | 1703 fps | 97% |
| Accurate 2495 | <<locked>> | 90% | 30,429 psi | 87% | 1745 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 84% | 30,516 psi | 87% | 1749 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 96% | 30,980 psi | 89% | 1155 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 96% | 30,966 psi | 88% | 1184 fps | 100% |
| Vihtavuori N133 | <<locked>> | 82% | 30,052 psi | 86% | 1660 fps | 96.3% |
| Vihtavuori N135 | <<locked>> | 88% | 30,081 psi | 86% | 1722 fps | 96.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 29,530 psi | 84% | 1670 fps | 96.3% |
| Accurate 2495 | 38.4 gr | 86% | 26,658 psi | 76% | 1670 fps | 95.5% |
| Alliant AR-Comp | <<locked>> | 80% | 26,861 psi | 77% | 1670 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 24,105 psi | 69% | 1050 fps | 100% |
| ReloadSwiss RS 14 | 12.6 gr | 80% | 24,207 psi | 69% | 1079 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 28,442 psi | 81% | 1627 fps | 95.7% |
| Vihtavuori N135 | 36.3 gr | 84% | 26,643 psi | 76% | 1650 fps | 95.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 7 powders for .375 SOCOM loaded with the .375 | 300gr | A-Square LionLoad. Alliant AR-Comp delivers the highest muzzle velocity at 1,749 fps; across all powders the maximum-charge window runs from 1,155 fps to 1,749 fps. Hodgdon TrailBoss gives the best case fill at 96 %, and 7 of the 7 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (241 MPa), the top charges use 86–89 %, leaving at least 11 % headroom. Accurate 2495, Vihtavuori N135, ReloadSwiss RS 14 rank at the top here: for .375 SOCOM with the .375 | 300gr | A-Square LionLoad they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.