Load Specifications
Load data in caliber .458 x 2'' American with .458 | 400gr | Speer Soft Point Flat Nose bullet and 36 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>> | 96% | 53,432 psi | 89% | 2064 fps | 99.8% |
| Accurate 2015ᴾ | <<locked>> | 100% | 35,418 psi | 59% | 1916 fps | 96.8% |
| Accurate 5744 | <<locked>> | 86% | 53,998 psi | 90% | 2077 fps | 100% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 50,270 psi | 84% | 2018 fps | 98% |
| Accurate LT-32ᴾ | <<locked>> | 100% | 50,879 psi | 85% | 2018 fps | 96.1% |
| Accurate No. 11 FS | <<locked>> | 84% | 52,982 psi | 88% | 2024 fps | 100% |
| ADI AR 2205 | <<locked>> | 88% | 53,896 psi | 90% | 1965 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 50,604 psi | 84% | 2093 fps | 100% |
| ADI AR 2219ᴾ | <<locked>> | 100% | 46,499 psi | 78% | 2083 fps | 97.2% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 33,605 psi | 56% | 1932 fps | 98.4% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 41,481 psi | 69% | 2018 fps | 99.1% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 53,592 psi | 89% | 2100 fps | 100% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 47,790 psi | 80% | 2018 fps | 97.9% |
| Hodgdon H335ᴾ | <<locked>> | 100% | 45,542 psi | 76% | 2073 fps | 95.8% |
| Hodgdon H4198ᴾ | <<locked>> | 100% | 51,837 psi | 86% | 2044 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,037 psi | 50% | 1188 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 45,063 psi | 75% | 2008 fps | 99.8% |
| IMR 4227 | <<locked>> | 94% | 52,939 psi | 88% | 2041 fps | 100% |
| Lovex D060 | <<locked>> | 88% | 53,998 psi | 90% | 2077 fps | 100% |
| Lovex D063 | <<locked>> | 86% | 51,721 psi | 86% | 2028 fps | 100% |
| Lovex D073.4ᴾ | <<locked>> | 100% | 49,937 psi | 83% | 2116 fps | 95.9% |
| Lovex S053 | <<locked>> | 96% | 53,795 psi | 90% | 2034 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 47,137 psi | 79% | 2077 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 29,515 psi | 49% | 1214 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 51,706 psi | 86% | 2067 fps | 100% |
| Shooters World AR Plusᴾ | <<locked>> | 100% | 49,937 psi | 83% | 2116 fps | 95.9% |
| Shooters World Blackout | <<locked>> | 84% | 53,983 psi | 90% | 2064 fps | 100% |
| Shooters World Buffalo Rifle | <<locked>> | 88% | 53,998 psi | 90% | 2077 fps | 100% |
| Shooters World SOCOM | <<locked>> | 86% | 51,721 psi | 86% | 2028 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 98% | 51,909 psi | 87% | 1893 fps | 100% |
| SNPE Vectan SP 10ᴾ | <<locked>> | 100% | 46,267 psi | 77% | 2087 fps | 96.1% |
| SNPE Vectan SP 3ᴾ | <<locked>> | 100% | 43,265 psi | 72% | 2014 fps | 97.6% |
| Vihtavuori N110 | <<locked>> | 90% | 53,606 psi | 89% | 1962 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 50,792 psi | 85% | 2057 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 40,466 psi | 67% | 1949 fps | 98.6% |
| Vihtavuori N133ᴾ | <<locked>> | 100% | 35,317 psi | 59% | 1870 fps | 96.2% |
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% | 31,894 psi | 53% | 1775 fps | 96.6% |
| Accurate 2015 | <<locked>> | 96% | 31,270 psi | 52% | 1847 fps | 95.5% |
| Accurate 5744 | <<locked>> | 80% | 45,179 psi | 75% | 1969 fps | 99.7% |
| Accurate LT-30 | <<locked>> | 90% | 37,507 psi | 63% | 1850 fps | 95.3% |
| Accurate LT-32 | <<locked>> | 96% | 45,498 psi | 76% | 1952 fps | 95% |
| Accurate No. 11 FS | <<locked>> | 80% | 46,702 psi | 78% | 1959 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 42,627 psi | 71% | 1844 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 27,514 psi | 46% | 1762 fps | 99% |
| ADI AR 2219 | <<locked>> | 94% | 38,406 psi | 64% | 1965 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 92% | 26,585 psi | 44% | 1785 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 86% | 27,180 psi | 45% | 1775 fps | 95.3% |
| Alliant Reloder-7 | 39.9 gr | 80% | 29,298 psi | 49% | 1759 fps | 96.6% |
| Baschieri & Pellagri 106 | <<locked>> | 92% | 37,159 psi | 62% | 1873 fps | 95.5% |
| Hodgdon H335 | <<locked>> | 98% | 42,670 psi | 71% | 2034 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 90% | 38,885 psi | 65% | 1877 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,959 psi | 37% | 1056 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 26,020 psi | 43% | 1680 fps | 95.3% |
| IMR 4227 | 37.7 gr | 80% | 35,027 psi | 58% | 1811 fps | 99.4% |
| Lovex D060 | <<locked>> | 80% | 42,757 psi | 71% | 1936 fps | 99.5% |
| Lovex D063 | <<locked>> | 80% | 42,380 psi | 71% | 1916 fps | 99.7% |
| Lovex D073.4 | <<locked>> | 98% | 46,427 psi | 77% | 2073 fps | 95.2% |
| Lovex S053 | <<locked>> | 80% | 34,287 psi | 57% | 1795 fps | 100% |
| Norma 200 | <<locked>> | 80% | 25,425 psi | 42% | 1726 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,698 psi | 36% | 1086 fps | 100% |
| ReloadSwiss RS 36 | 40.1 gr | 80% | 33,895 psi | 57% | 1831 fps | 99.2% |
| Shooters World AR Plus | <<locked>> | 98% | 46,427 psi | 77% | 2073 fps | 95.2% |
| Shooters World Blackout | <<locked>> | 80% | 47,239 psi | 79% | 1988 fps | 99.8% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 42,757 psi | 71% | 1936 fps | 99.5% |
| Shooters World SOCOM | <<locked>> | 80% | 42,380 psi | 71% | 1916 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 32,358 psi | 54% | 1667 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 98% | 43,424 psi | 72% | 2047 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 34,229 psi | 57% | 1873 fps | 95.2% |
| Vihtavuori N110 | <<locked>> | 80% | 40,422 psi | 67% | 1821 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 27,847 psi | 46% | 1742 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 88% | 28,500 psi | 48% | 1752 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 98% | 33,475 psi | 56% | 1841 fps | 95.6% |
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 54 powders for .458 x 2'' American loaded with the .458 | 400gr | Speer Soft Point Flat Nose. Lovex D073.4 delivers the highest muzzle velocity at 2,116 fps; across all powders the maximum-charge window runs from 1,188 fps to 2,116 fps. Accurate 2015 gives the best case fill at 100 %, and 54 of the 54 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (414 MPa), the top charges use 40–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate 2200, Accurate 2230 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 x 2'' American with the .458 | 400gr | Speer Soft Point Flat Nose they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2200, Accurate 2230, Accurate 2460 burn incompletely and react more sensitively to barrel length and temperature. 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.