Load Specifications
Load data in caliber .458 SOCOM with .458 | 350gr | Hornady InterLock RN 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 |
|---|---|---|---|---|---|---|
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,905 psi | 77% | 1099 fps | 100% |
| Lovex S053 | <<locked>> | 88% | 31,256 psi | 89% | 1650 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 26,208 psi | 75% | 1125 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 90% | 31,212 psi | 89% | 1591 fps | 100% |
| Vihtavuori N110 | <<locked>> | 82% | 31,067 psi | 89% | 1627 fps | 99.9% |
| Vihtavuori N120 | <<locked>> | 96% | 31,618 psi | 90% | 1696 fps | 95.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 16"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Hodgdon TrailBoss | <<locked>> | 80% | 19,667 psi | 56% | 981 fps | 100% |
| Lovex S053 | <<locked>> | 84% | 27,804 psi | 79% | 1588 fps | 95.5% |
| ReloadSwiss RS 14 | 11.2 gr | 80% | 19,087 psi | 55% | 1001 fps | 100% |
| SNPE Vectan BA6 1/2 | 26.7 gr | 80% | 23,917 psi | 68% | 1463 fps | 99.7% |
| Vihtavuori N110 | <<locked>> | 80% | 29,283 psi | 84% | 1598 fps | 99.8% |
| Vihtavuori N120 | 35.7 gr | 94% | 29,733 psi | 85% | 1663 fps | 95% |
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 6 powders for .458 SOCOM loaded with the .458 | 350gr | Hornady InterLock RN. Vihtavuori N120 delivers the highest muzzle velocity at 1,696 fps; across all powders the maximum-charge window runs from 1,099 fps to 1,696 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 6 of the 6 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (241 MPa), the top charges use 75–90 %, 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 | 350gr | Hornady InterLock RN 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.