Load Specifications
Load data in caliber .458 SOCOM with .458 | 410gr | Hornady 458 SOCOM Sub bullet and 6 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N120, SNPE Vectan BA6 1/2 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 |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 94% | 31,038 psi | 89% | 1552 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 27,412 psi | 78% | 988 fps | 100% |
| Lovex S053 | <<locked>> | 86% | 31,299 psi | 89% | 1493 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,890 psi | 77% | 1014 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 88% | 31,531 psi | 90% | 1434 fps | 100% |
| Vihtavuori N120 | <<locked>> | 94% | 31,604 psi | 90% | 1539 fps | 97.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AR 2207 | <<locked>> | 92% | 29,312 psi | 84% | 1522 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,044 psi | 57% | 879 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 26,455 psi | 76% | 1411 fps | 96.4% |
| ReloadSwiss RS 14 | 10.3 gr | 80% | 19,551 psi | 56% | 902 fps | 100% |
| SNPE Vectan BA6 1/2 | 24.6 gr | 80% | 25,367 psi | 72% | 1342 fps | 100% |
| Vihtavuori N120 | 30.8 gr | 88% | 26,658 psi | 76% | 1453 fps | 95.4% |
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 11 powders for .458 SOCOM loaded with the .458 | 410gr | Hornady 458 SOCOM Sub. Norma 200 delivers the highest muzzle velocity at 1,568 fps; across all powders the maximum-charge window runs from 988 fps to 1,568 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 11 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (241 MPa), the top charges use 77–90 %, leaving at least 10 % headroom. 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. Vihtavuori N120, SNPE Vectan BA6 1/2, ReloadSwiss RS 14 rank at the top here: for .458 SOCOM with the .458 | 410gr | Hornady 458 SOCOM Sub they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-7, IMR 4198, IMR 4227 burn incompletely and react more sensitively to barrel length and temperature. 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.