Load Specifications
Load data in caliber .458 x 2'' American with .458 | 350gr | Swift A-Frame bullet and 25 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 1680ᴾ | <<locked>> | 100% | 52,852 psi | 88% | 2175 fps | 98.8% |
| Accurate 5744 | <<locked>> | 86% | 54,012 psi | 90% | 2205 fps | 99.5% |
| Accurate No. 11 FS | <<locked>> | 88% | 52,576 psi | 88% | 2156 fps | 100% |
| ADI APS 450 | <<locked>> | 82% | 53,969 psi | 90% | 1581 fps | 100% |
| ADI AR 2205 | <<locked>> | 92% | 54,056 psi | 90% | 2096 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 42,641 psi | 71% | 2139 fps | 99.9% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 34,708 psi | 58% | 2034 fps | 95.7% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 45,672 psi | 76% | 2136 fps | 98.5% |
| Hodgdon LilGun | <<locked>> | 84% | 53,737 psi | 90% | 2178 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 28,718 psi | 48% | 1250 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 39,334 psi | 66% | 2041 fps | 97.6% |
| IMR 4227 | <<locked>> | 98% | 52,083 psi | 87% | 2159 fps | 99.9% |
| Lovex D060 | <<locked>> | 92% | 54,012 psi | 90% | 2205 fps | 99.5% |
| Lovex D063 | <<locked>> | 88% | 54,027 psi | 90% | 2188 fps | 99.6% |
| Lovex S040 | <<locked>> | 84% | 52,794 psi | 88% | 2060 fps | 100% |
| Lovex S053ᴾ | <<locked>> | 100% | 52,185 psi | 87% | 2156 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 39,407 psi | 66% | 2103 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,050 psi | 47% | 1276 fps | 100% |
| ReloadSwiss RS 36ᴾ | <<locked>> | 100% | 53,592 psi | 89% | 2221 fps | 100% |
| Shooters World Blackout | <<locked>> | 88% | 54,027 psi | 90% | 2188 fps | 99.6% |
| Shooters World Buffalo Rifle | <<locked>> | 92% | 54,012 psi | 90% | 2205 fps | 99.5% |
| Shooters World SOCOM | <<locked>> | 90% | 51,459 psi | 86% | 2146 fps | 99.6% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 47,848 psi | 80% | 1988 fps | 100% |
| Vihtavuori N110 | <<locked>> | 94% | 52,402 psi | 87% | 2090 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 43,018 psi | 72% | 2106 fps | 100% |
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>> | 88% | 35,824 psi | 60% | 1949 fps | 95.5% |
| Accurate 5744 | <<locked>> | 80% | 44,962 psi | 75% | 2083 fps | 98.6% |
| Accurate No. 11 FS | <<locked>> | 80% | 40,683 psi | 68% | 2008 fps | 99.8% |
| ADI APS 450 | <<locked>> | 80% | 52,127 psi | 87% | 1562 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 37,826 psi | 63% | 1900 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 23,569 psi | 39% | 1778 fps | 95.5% |
| Alliant Reloder-10x | <<locked>> | 98% | 32,779 psi | 55% | 1998 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 88% | 31,763 psi | 53% | 1916 fps | 95.2% |
| Hodgdon LilGun | <<locked>> | 80% | 47,181 psi | 79% | 2110 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 20,885 psi | 35% | 1112 fps | 100% |
| IMR 4198 | <<locked>> | 92% | 31,589 psi | 53% | 1900 fps | 95.1% |
| IMR 4227 | <<locked>> | 80% | 30,647 psi | 51% | 1844 fps | 96.8% |
| Lovex D060 | 37.2 gr | 80% | 38,218 psi | 64% | 1978 fps | 97.2% |
| Lovex D063 | <<locked>> | 80% | 41,452 psi | 69% | 2028 fps | 98.1% |
| Lovex S040 | <<locked>> | 80% | 47,181 psi | 79% | 1998 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 29,762 psi | 50% | 1834 fps | 99.3% |
| Norma 200 | <<locked>> | 92% | 30,777 psi | 51% | 1955 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,523 psi | 34% | 1138 fps | 100% |
| ReloadSwiss RS 36 | 38.7 gr | 80% | 29,196 psi | 49% | 1857 fps | 96.2% |
| Shooters World Blackout | <<locked>> | 80% | 41,452 psi | 69% | 2028 fps | 98.1% |
| Shooters World Buffalo Rifle | 37.2 gr | 80% | 38,218 psi | 64% | 1978 fps | 97.2% |
| Shooters World SOCOM | <<locked>> | 80% | 37,130 psi | 62% | 1952 fps | 97.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 28,485 psi | 47% | 1726 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 35,259 psi | 59% | 1883 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 24,018 psi | 40% | 1762 fps | 97% |
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 25 powders for .458 x 2'' American loaded with the .458 | 350gr | Swift A-Frame. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,221 fps; across all powders the maximum-charge window runs from 1,250 fps to 2,221 fps. Accurate 1680 gives the best case fill at 100 %, and 25 of the 25 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 1680, ADI AR 2207, Alliant Reloder-10x 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 | 350gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss 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.