Load Specifications
Load data in caliber .458 Win.Mag. with .458 | 300gr | Impala LWHV LS bullet and 31 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 36, IMR 4227 and Alliant Reloder-7.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 94% | 53,287 psi | 85% | 2526 fps | 99.3% |
| Accurate 2015ᴾ | <<locked>> | 100% | 39,218 psi | 63% | 2395 fps | 96.1% |
| Accurate 5744 | <<locked>> | 82% | 55,811 psi | 89% | 2582 fps | 99.9% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 53,127 psi | 85% | 2507 fps | 97.3% |
| Accurate No. 11 FS | <<locked>> | 84% | 55,941 psi | 90% | 2530 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 55,492 psi | 89% | 1893 fps | 100% |
| ADI AR 2205 | <<locked>> | 88% | 56,405 psi | 90% | 2457 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 53,940 psi | 86% | 2612 fps | 100% |
| ADI AR 2219ᴾ | <<locked>> | 100% | 49,806 psi | 80% | 2585 fps | 96.4% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 36,651 psi | 59% | 2405 fps | 97.7% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 45,165 psi | 72% | 2516 fps | 98.6% |
| Alliant Reloder-7 | <<locked>> | 98% | 53,882 psi | 86% | 2575 fps | 99.7% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 50,778 psi | 81% | 2503 fps | 97.2% |
| Hodgdon H4198 | <<locked>> | 98% | 55,288 psi | 89% | 2552 fps | 97.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,024 psi | 50% | 1503 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 47,674 psi | 76% | 2500 fps | 99.4% |
| IMR 4227 | <<locked>> | 94% | 55,695 psi | 89% | 2546 fps | 100% |
| Lovex D060 | <<locked>> | 88% | 56,362 psi | 90% | 2589 fps | 99.9% |
| Lovex D063 | <<locked>> | 86% | 54,186 psi | 87% | 2523 fps | 99.9% |
| Lovex S053 | <<locked>> | 94% | 53,708 psi | 86% | 2503 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2595 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,705 psi | 49% | 1539 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 54,723 psi | 88% | 2579 fps | 100% |
| Shooters World Blackout | <<locked>> | 82% | 53,011 psi | 85% | 2526 fps | 99.8% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 56,362 psi | 90% | 2589 fps | 99.9% |
| Shooters World SOCOM | <<locked>> | 86% | 54,186 psi | 87% | 2523 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 54,244 psi | 87% | 2369 fps | 100% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 46,267 psi | 74% | 2507 fps | 96.8% |
| Vihtavuori N110 | <<locked>> | 88% | 53,969 psi | 87% | 2428 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 53,998 psi | 87% | 2566 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 43,787 psi | 70% | 2428 fps | 98% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 1680 | <<locked>> | 80% | 34,751 psi | 56% | 2218 fps | 95.8% |
| Accurate 2015 | <<locked>> | 98% | 36,956 psi | 59% | 2352 fps | 95.4% |
| Accurate 5744 | <<locked>> | 80% | 52,649 psi | 84% | 2536 fps | 99.7% |
| Accurate LT-30 | <<locked>> | 92% | 42,308 psi | 68% | 2343 fps | 95% |
| Accurate No. 11 FS | <<locked>> | 80% | 49,414 psi | 79% | 2448 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 53,563 psi | 86% | 1870 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 44,947 psi | 72% | 2306 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 30,574 psi | 49% | 2211 fps | 98.5% |
| ADI AR 2219 | <<locked>> | 96% | 44,034 psi | 71% | 2490 fps | 95% |
| Alliant AR-Comp | <<locked>> | 94% | 31,067 psi | 50% | 2270 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 88% | 32,097 psi | 51% | 2264 fps | 95.2% |
| Alliant Reloder-7 | 51.9 gr | 80% | 32,358 psi | 52% | 2201 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 94% | 42,293 psi | 68% | 2372 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 92% | 46,499 psi | 75% | 2425 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,090 psi | 37% | 1342 fps | 100% |
| IMR 4198 | <<locked>> | 82% | 29,791 psi | 48% | 2142 fps | 95% |
| IMR 4227 | 49.1 gr | 80% | 37,507 psi | 60% | 2264 fps | 98.9% |
| Lovex D060 | <<locked>> | 80% | 45,121 psi | 72% | 2418 fps | 99% |
| Lovex D063 | <<locked>> | 80% | 44,976 psi | 72% | 2392 fps | 99.4% |
| Lovex S053 | <<locked>> | 80% | 36,999 psi | 59% | 2247 fps | 100% |
| Norma 200 | <<locked>> | 80% | 29,298 psi | 47% | 2178 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,829 psi | 37% | 1375 fps | 100% |
| ReloadSwiss RS 36 | 52.2 gr | 80% | 36,695 psi | 59% | 2290 fps | 98.6% |
| Shooters World Blackout | <<locked>> | 80% | 49,806 psi | 80% | 2480 fps | 99.5% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 45,121 psi | 72% | 2418 fps | 99% |
| Shooters World SOCOM | <<locked>> | 80% | 44,976 psi | 72% | 2392 fps | 99.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 34,867 psi | 56% | 2096 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 96% | 41,481 psi | 67% | 2421 fps | 95.6% |
| Vihtavuori N110 | <<locked>> | 80% | 43,453 psi | 70% | 2290 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 30,763 psi | 49% | 2185 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 90% | 33,228 psi | 53% | 2231 fps | 95.2% |
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 31 powders for .458 Win.Mag. loaded with the .458 | 300gr | Impala LWHV LS. ADI AR 2207 delivers the highest muzzle velocity at 2,612 fps; across all powders the maximum-charge window runs from 1,503 fps to 2,612 fps. Accurate 2015 gives the best case fill at 100 %, and 31 of the 31 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate LT-30, ADI AR 2207 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. ReloadSwiss RS 36, IMR 4227, Alliant Reloder-7 rank at the top here: for .458 Win.Mag. with the .458 | 300gr | Impala LWHV LS 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.