Load Specifications
Load data in caliber .458 SOCOM with .458 | 405gr | CamPro FCP RNFP 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, ADI AR 2207 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>> | 92% | 31,314 psi | 89% | 1598 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,239 psi | 81% | 1027 fps | 100% |
| Lovex S053 | <<locked>> | 84% | 31,415 psi | 90% | 1529 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 27,383 psi | 78% | 1047 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 86% | 31,589 psi | 90% | 1470 fps | 100% |
| Vihtavuori N120 | <<locked>> | 90% | 30,182 psi | 86% | 1555 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 | 33.3 gr | 88% | 27,934 psi | 80% | 1535 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,450 psi | 58% | 912 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 28,166 psi | 80% | 1476 fps | 97.5% |
| ReloadSwiss RS 14 | 11.1 gr | 80% | 19,943 psi | 57% | 932 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 26,905 psi | 77% | 1398 fps | 100% |
| Vihtavuori N120 | 31.8 gr | 84% | 25,353 psi | 72% | 1463 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 6 powders for .458 SOCOM loaded with the .458 | 405gr | CamPro FCP RNFP. ADI AR 2207 delivers the highest muzzle velocity at 1,598 fps; across all powders the maximum-charge window runs from 1,027 fps to 1,598 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 78–90 %, 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, ADI AR 2207, ReloadSwiss RS 14 rank at the top here: for .458 SOCOM with the .458 | 405gr | CamPro FCP RNFP 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.