Load Specifications
Load data in caliber .458 x 2'' American with .458 | 400gr | Swift A-Frame bullet and 27 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Shooters World Buffalo Rifle, Lovex D060 and ReloadSwiss RS 36.
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>> | 98% | 50,894 psi | 85% | 1969 fps | 99.1% |
| Accurate 5744 | <<locked>> | 84% | 51,982 psi | 87% | 1985 fps | 99.7% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 45,092 psi | 75% | 1883 fps | 95.9% |
| Accurate No. 11 FS | <<locked>> | 88% | 53,969 psi | 90% | 1972 fps | 100% |
| ADI AR 2205 | <<locked>> | 90% | 52,156 psi | 87% | 1890 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 44,106 psi | 74% | 1965 fps | 100% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 36,027 psi | 60% | 1880 fps | 97.1% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 47,166 psi | 79% | 1965 fps | 99.3% |
| Hodgdon H4198ᴾ | <<locked>> | 100% | 50,053 psi | 83% | 1949 fps | 96.3% |
| Hodgdon LilGun | <<locked>> | 82% | 52,127 psi | 87% | 1962 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,892 psi | 48% | 1129 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 40,480 psi | 67% | 1880 fps | 98.6% |
| IMR 4227 | <<locked>> | 98% | 53,635 psi | 89% | 1982 fps | 100% |
| Lovex D060 | <<locked>> | 90% | 52,315 psi | 87% | 1988 fps | 99.7% |
| Lovex D063 | <<locked>> | 86% | 51,866 psi | 86% | 1972 fps | 99.7% |
| Lovex S040 | <<locked>> | 82% | 51,024 psi | 85% | 1850 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 53,795 psi | 90% | 1975 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 40,741 psi | 68% | 1939 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,326 psi | 47% | 1158 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 98% | 52,069 psi | 87% | 2008 fps | 100% |
| Shooters World Blackout | <<locked>> | 86% | 51,866 psi | 86% | 1972 fps | 99.7% |
| Shooters World Buffalo Rifle | <<locked>> | 90% | 52,315 psi | 87% | 1988 fps | 99.7% |
| Shooters World SOCOM | <<locked>> | 90% | 52,852 psi | 88% | 1972 fps | 99.9% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 49,124 psi | 82% | 1814 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 54,012 psi | 90% | 1909 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 44,367 psi | 74% | 1932 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 35,549 psi | 59% | 1814 fps | 96.4% |
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>> | 84% | 32,460 psi | 54% | 1726 fps | 95.5% |
| Accurate 5744 | <<locked>> | 80% | 46,108 psi | 77% | 1916 fps | 99.3% |
| Accurate LT-30 | <<locked>> | 98% | 42,482 psi | 71% | 1850 fps | 95.2% |
| Accurate No. 11 FS | <<locked>> | 80% | 41,916 psi | 70% | 1844 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 38,928 psi | 65% | 1742 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 24,366 psi | 41% | 1644 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 94% | 30,095 psi | 50% | 1778 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 84% | 29,312 psi | 49% | 1703 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 96% | 44,599 psi | 74% | 1886 fps | 95.1% |
| Hodgdon LilGun | <<locked>> | 80% | 48,631 psi | 81% | 1929 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,248 psi | 35% | 1010 fps | 100% |
| IMR 4198 | <<locked>> | 88% | 29,240 psi | 49% | 1690 fps | 95.3% |
| IMR 4227 | <<locked>> | 80% | 31,589 psi | 53% | 1696 fps | 98% |
| Lovex D060 | 34 gr | 80% | 39,146 psi | 65% | 1818 fps | 98.2% |
| Lovex D063 | <<locked>> | 80% | 42,786 psi | 71% | 1867 fps | 98.9% |
| Lovex S040 | <<locked>> | 80% | 48,167 psi | 80% | 1824 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 30,647 psi | 51% | 1686 fps | 99.8% |
| Norma 200 | <<locked>> | 88% | 28,311 psi | 47% | 1739 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,740 psi | 35% | 1033 fps | 100% |
| ReloadSwiss RS 36 | 35.4 gr | 80% | 30,110 psi | 50% | 1713 fps | 97.5% |
| Shooters World Blackout | <<locked>> | 80% | 42,786 psi | 71% | 1867 fps | 98.9% |
| Shooters World Buffalo Rifle | 34 gr | 80% | 39,146 psi | 65% | 1818 fps | 98.2% |
| Shooters World SOCOM | <<locked>> | 80% | 38,305 psi | 64% | 1798 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,341 psi | 49% | 1578 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 36,405 psi | 61% | 1722 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 24,743 psi | 41% | 1627 fps | 98.2% |
| Vihtavuori N130 | <<locked>> | 96% | 31,691 psi | 53% | 1752 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 40 powders for .458 x 2'' American loaded with the .458 | 400gr | Swift A-Frame. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,008 fps; across all powders the maximum-charge window runs from 1,129 fps to 2,008 fps. Accurate 2015 gives the best case fill at 100 %, and 40 of the 40 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (414 MPa), the top charges use 47–90 %, 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. Shooters World Buffalo Rifle, Lovex D060, ReloadSwiss RS 36 rank at the top here: for .458 x 2'' American with the .458 | 400gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2015, Accurate LT-32, ADI AR 2219 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.