Load Specifications
Load data in caliber .458 SOCOM with .458 | 250gr | Hornady Monoflex bullet and 20 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N110, 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 LilGun | <<locked>> | 84% | 30,632 psi | 88% | 2024 fps | 97.9% |
| Hodgdon LilGun | <<locked>> | 82% | 31,589 psi | 90% | 2077 fps | 98.7% |
| Hodgdon LilGun | <<locked>> | 84% | 30,530 psi | 87% | 2028 fps | 97.9% |
| Hodgdon LilGun | <<locked>> | 84% | 30,632 psi | 88% | 2024 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 23,917 psi | 68% | 1286 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 24,540 psi | 70% | 1322 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 23,786 psi | 68% | 1283 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 23,917 psi | 68% | 1286 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 22,756 psi | 65% | 1309 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 23,656 psi | 68% | 1352 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 22,887 psi | 65% | 1312 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 22,756 psi | 65% | 1309 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 30,371 psi | 87% | 1893 fps | 98.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 31,212 psi | 89% | 1942 fps | 99.3% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 30,414 psi | 87% | 1893 fps | 98.8% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 30,371 psi | 87% | 1893 fps | 98.8% |
| Vihtavuori N110 | <<locked>> | 92% | 30,429 psi | 87% | 1932 fps | 97.3% |
| Vihtavuori N110 | <<locked>> | 90% | 31,401 psi | 90% | 1985 fps | 98.1% |
| Vihtavuori N110 | <<locked>> | 92% | 30,676 psi | 88% | 1939 fps | 97.4% |
| Vihtavuori N110 | <<locked>> | 92% | 30,429 psi | 87% | 1932 fps | 97.3% |
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 LilGun | <<locked>> | 80% | 26,687 psi | 76% | 1939 fps | 96.5% |
| Hodgdon LilGun | <<locked>> | 80% | 29,486 psi | 84% | 2034 fps | 98.2% |
| Hodgdon LilGun | <<locked>> | 80% | 26,934 psi | 77% | 1946 fps | 96.7% |
| Hodgdon LilGun | <<locked>> | 80% | 26,687 psi | 76% | 1939 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 17,202 psi | 49% | 1142 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 17,927 psi | 51% | 1181 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 17,318 psi | 49% | 1145 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 17,202 psi | 49% | 1142 fps | 100% |
| ReloadSwiss RS 14 | 11.1 gr | 80% | 16,505 psi | 47% | 1165 fps | 100% |
| ReloadSwiss RS 14 | 11.1 gr | 80% | 17,231 psi | 49% | 1204 fps | 100% |
| ReloadSwiss RS 14 | 11.1 gr | 80% | 16,636 psi | 48% | 1168 fps | 100% |
| ReloadSwiss RS 14 | 11.1 gr | 80% | 16,505 psi | 47% | 1165 fps | 100% |
| SNPE Vectan BA6 1/2 | 28.6 gr | 86% | 21,248 psi | 61% | 1677 fps | 95% |
| SNPE Vectan BA6 1/2 | 27.3 gr | 82% | 20,653 psi | 59% | 1690 fps | 95.5% |
| SNPE Vectan BA6 1/2 | 28.6 gr | 86% | 21,292 psi | 61% | 1677 fps | 95.1% |
| SNPE Vectan BA6 1/2 | 28.6 gr | 86% | 21,248 psi | 61% | 1677 fps | 95% |
| Vihtavuori N110 | 29.8 gr | 86% | 25,498 psi | 73% | 1827 fps | 95.3% |
| Vihtavuori N110 | 28.5 gr | 82% | 24,874 psi | 71% | 1841 fps | 95.7% |
| Vihtavuori N110 | 29.8 gr | 86% | 25,759 psi | 74% | 1834 fps | 95.5% |
| Vihtavuori N110 | 29.8 gr | 86% | 25,498 psi | 73% | 1827 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 20 powders for .458 SOCOM loaded with the .458 | 250gr | Hornady Monoflex. Hodgdon LilGun delivers the highest muzzle velocity at 2,077 fps; across all powders the maximum-charge window runs from 1,283 fps to 2,077 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 20 of the 20 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (241 MPa), the top charges use 65–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, Hodgdon TrailBoss, Hodgdon TrailBoss 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 N110, SNPE Vectan BA6 1/2, ReloadSwiss RS 14 rank at the top here: for .458 SOCOM with the .458 | 250gr | Hornady Monoflex 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.