Load Specifications
Load data in caliber .458 Win.Mag. with .458 | 300gr | Barnes X S bullet and 34 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-7, ReloadSwiss RS 36 and ADI AR 2207.
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% | 55,376 psi | 89% | 2579 fps | 99.6% |
| Accurate 2015ᴾ | <<locked>> | 100% | 41,075 psi | 66% | 2451 fps | 97% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2562 fps | 98% |
| Accurate LT-32ᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2562 fps | 96% |
| Accurate No. 11 FS | <<locked>> | 82% | 54,433 psi | 87% | 2536 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 55,898 psi | 90% | 1923 fps | 100% |
| ADI AR 2205 | <<locked>> | 86% | 54,998 psi | 88% | 2464 fps | 100% |
| ADI AR 2207 | <<locked>> | 98% | 53,127 psi | 85% | 2621 fps | 100% |
| ADI AR 2219ᴾ | <<locked>> | 100% | 51,924 psi | 83% | 2648 fps | 97.3% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 38,174 psi | 61% | 2464 fps | 98.5% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 47,355 psi | 76% | 2572 fps | 99.1% |
| Alliant Reloder-7 | <<locked>> | 98% | 56,101 psi | 90% | 2631 fps | 99.9% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 52,939 psi | 85% | 2559 fps | 97.9% |
| Hodgdon H322ᴾ | <<locked>> | 100% | 46,789 psi | 75% | 2566 fps | 96.2% |
| Hodgdon H4198 | <<locked>> | 96% | 54,056 psi | 87% | 2566 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 31,343 psi | 50% | 1526 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 49,516 psi | 79% | 2556 fps | 99.7% |
| IMR 4227 | <<locked>> | 92% | 54,549 psi | 87% | 2556 fps | 100% |
| Lovex D060 | <<locked>> | 86% | 54,839 psi | 88% | 2595 fps | 99.9% |
| Lovex D063 | <<locked>> | 82% | 54,824 psi | 88% | 2575 fps | 99.9% |
| Lovex S053 | <<locked>> | 94% | 55,608 psi | 89% | 2549 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 54,157 psi | 87% | 2651 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 31,198 psi | 50% | 1565 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 53,896 psi | 86% | 2589 fps | 100% |
| Shooters World Blackout | <<locked>> | 82% | 54,824 psi | 88% | 2575 fps | 99.9% |
| Shooters World Buffalo Rifle | <<locked>> | 86% | 54,839 psi | 88% | 2595 fps | 99.9% |
| Shooters World SOCOM | <<locked>> | 86% | 56,057 psi | 90% | 2572 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 56,130 psi | 90% | 2408 fps | 100% |
| SNPE Vectan SP 10ᴾ | <<locked>> | 100% | 51,866 psi | 83% | 2648 fps | 96.2% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 48,254 psi | 77% | 2566 fps | 97.6% |
| Vihtavuori N110 | <<locked>> | 88% | 55,767 psi | 89% | 2470 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 53,200 psi | 85% | 2579 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 45,730 psi | 73% | 2484 fps | 98.6% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 39,856 psi | 64% | 2385 fps | 96.3% |
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% | 36,042 psi | 58% | 2267 fps | 96.7% |
| Accurate 2015 | <<locked>> | 94% | 34,693 psi | 56% | 2326 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 90% | 41,466 psi | 66% | 2352 fps | 95.2% |
| Accurate LT-32 | <<locked>> | 98% | 52,663 psi | 84% | 2523 fps | 95.5% |
| Accurate No. 11 FS | <<locked>> | 80% | 51,039 psi | 82% | 2490 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 53,780 psi | 86% | 1896 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 46,369 psi | 74% | 2349 fps | 100% |
| ADI AR 2207 | 52.4 gr | 80% | 31,836 psi | 51% | 2260 fps | 99% |
| ADI AR 2219 | <<locked>> | 94% | 43,149 psi | 69% | 2503 fps | 95.3% |
| Alliant AR-Comp | <<locked>> | 90% | 29,008 psi | 47% | 2241 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 86% | 31,807 psi | 51% | 2277 fps | 95.6% |
| Alliant Reloder-7 | 54.2 gr | 80% | 33,678 psi | 54% | 2251 fps | 96.7% |
| Baschieri & Pellagri 106 | <<locked>> | 92% | 41,481 psi | 67% | 2382 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 98% | 44,179 psi | 71% | 2523 fps | 95.6% |
| Hodgdon H4198 | <<locked>> | 88% | 43,062 psi | 69% | 2392 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,308 psi | 37% | 1365 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,254 psi | 47% | 2149 fps | 95.2% |
| IMR 4227 | <<locked>> | 80% | 38,885 psi | 62% | 2313 fps | 99.3% |
| Lovex D060 | <<locked>> | 80% | 46,456 psi | 74% | 2467 fps | 99.3% |
| Lovex D063 | <<locked>> | 80% | 51,648 psi | 83% | 2530 fps | 99.8% |
| Lovex S053 | <<locked>> | 80% | 38,247 psi | 61% | 2290 fps | 100% |
| Norma 200 | <<locked>> | 80% | 30,574 psi | 49% | 2228 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,047 psi | 37% | 1394 fps | 100% |
| ReloadSwiss RS 36 | 54.5 gr | 80% | 38,116 psi | 61% | 2339 fps | 99.1% |
| Shooters World Blackout | <<locked>> | 80% | 51,648 psi | 83% | 2530 fps | 99.8% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 46,456 psi | 74% | 2467 fps | 99.3% |
| Shooters World SOCOM | <<locked>> | 80% | 46,543 psi | 75% | 2441 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 36,100 psi | 58% | 2133 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 98% | 48,660 psi | 78% | 2602 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 38,551 psi | 62% | 2392 fps | 95.2% |
| Vihtavuori N110 | <<locked>> | 80% | 44,846 psi | 72% | 2329 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 31,995 psi | 51% | 2231 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 88% | 32,779 psi | 53% | 2241 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 96% | 35,810 psi | 57% | 2306 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 34 powders for .458 Win.Mag. loaded with the .458 | 300gr | Barnes X S. Norma 200 delivers the highest muzzle velocity at 2,651 fps; across all powders the maximum-charge window runs from 1,526 fps to 2,651 fps. Accurate 2015 gives the best case fill at 100 %, and 34 of the 34 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate LT-30, Accurate LT-32 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. Alliant Reloder-7, ReloadSwiss RS 36, ADI AR 2207 rank at the top here: for .458 Win.Mag. with the .458 | 300gr | Barnes X S 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.