Load Specifications
Load data in caliber .458 x 2'' American with .458 | 400gr | Alaska Bullet Works Kodiak RN SPBC bullet and 29 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 Accurate 5744.
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% | 52,170 psi | 87% | 1995 fps | 99.4% |
| Accurate 5744 | <<locked>> | 88% | 53,432 psi | 89% | 2014 fps | 99.9% |
| Accurate LT-30ᴾ | <<locked>> | 100% | 46,064 psi | 77% | 1909 fps | 96.3% |
| Accurate No. 11 FS | <<locked>> | 86% | 51,793 psi | 86% | 1965 fps | 100% |
| ADI AR 2205 | <<locked>> | 90% | 53,214 psi | 89% | 1909 fps | 100% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 45,397 psi | 76% | 1991 fps | 100% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 30,298 psi | 51% | 1811 fps | 96.1% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 37,028 psi | 62% | 1906 fps | 97.6% |
| Alliant Reloder-7ᴾ | <<locked>> | 100% | 48,356 psi | 81% | 1991 fps | 99.5% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 43,540 psi | 73% | 1906 fps | 96% |
| Hodgdon H4198ᴾ | <<locked>> | 100% | 47,587 psi | 79% | 1936 fps | 96% |
| Hodgdon LilGun | <<locked>> | 82% | 53,142 psi | 89% | 1982 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,109 psi | 49% | 1142 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 41,292 psi | 69% | 1906 fps | 98.9% |
| IMR 4227 | <<locked>> | 96% | 51,764 psi | 86% | 1975 fps | 100% |
| Lovex D060 | <<locked>> | 90% | 53,011 psi | 88% | 2011 fps | 99.8% |
| Lovex D063 | <<locked>> | 90% | 54,027 psi | 90% | 1998 fps | 100% |
| Lovex S040 | <<locked>> | 82% | 52,141 psi | 87% | 1873 fps | 100% |
| Lovex S053 | <<locked>> | 98% | 52,069 psi | 87% | 1969 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 41,959 psi | 70% | 1965 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,572 psi | 48% | 1168 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 98% | 53,345 psi | 89% | 2034 fps | 100% |
| Shooters World Blackout | <<locked>> | 86% | 53,185 psi | 89% | 2001 fps | 99.9% |
| Shooters World Buffalo Rifle | <<locked>> | 90% | 53,011 psi | 88% | 2011 fps | 99.8% |
| Shooters World SOCOM | <<locked>> | 90% | 54,027 psi | 90% | 1998 fps | 100% |
| SNPE Vectan BA6 1/2ᴾ | <<locked>> | 100% | 50,357 psi | 84% | 1837 fps | 100% |
| Vihtavuori N110 | <<locked>> | 92% | 52,112 psi | 87% | 1903 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 45,672 psi | 76% | 1959 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 36,550 psi | 61% | 1844 fps | 96.9% |
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>> | 82% | 31,067 psi | 52% | 1716 fps | 95.3% |
| Accurate 5744 | 35.7 gr | 80% | 42,177 psi | 70% | 1877 fps | 98.9% |
| Accurate LT-30 | <<locked>> | 96% | 40,915 psi | 68% | 1844 fps | 95.1% |
| Accurate No. 11 FS | <<locked>> | 80% | 42,714 psi | 71% | 1864 fps | 100% |
| ADI AR 2205 | <<locked>> | 80% | 39,682 psi | 66% | 1762 fps | 100% |
| ADI AR 2207 | <<locked>> | 80% | 25,005 psi | 42% | 1667 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 98% | 28,645 psi | 48% | 1775 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 92% | 29,254 psi | 49% | 1775 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 82% | 28,210 psi | 47% | 1693 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 98% | 40,988 psi | 68% | 1873 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 98% | 44,831 psi | 75% | 1903 fps | 95.4% |
| Hodgdon LilGun | <<locked>> | 80% | 49,980 psi | 83% | 1952 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,393 psi | 36% | 1020 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 28,297 psi | 47% | 1683 fps | 95.2% |
| IMR 4227 | <<locked>> | 80% | 32,155 psi | 54% | 1719 fps | 98.3% |
| Lovex D060 | 34.9 gr | 80% | 39,987 psi | 67% | 1844 fps | 98.5% |
| Lovex D063 | <<locked>> | 80% | 38,957 psi | 65% | 1821 fps | 98.9% |
| Lovex S040 | <<locked>> | 80% | 49,342 psi | 82% | 1847 fps | 100% |
| Lovex S053 | <<locked>> | 80% | 31,459 psi | 52% | 1709 fps | 99.9% |
| Norma 200 | <<locked>> | 86% | 27,282 psi | 45% | 1729 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,900 psi | 35% | 1043 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 80% | 30,850 psi | 51% | 1736 fps | 97.9% |
| Shooters World Blackout | <<locked>> | 80% | 43,468 psi | 72% | 1890 fps | 99.1% |
| Shooters World Buffalo Rifle | 34.9 gr | 80% | 39,987 psi | 67% | 1844 fps | 98.5% |
| Shooters World SOCOM | <<locked>> | 80% | 38,957 psi | 65% | 1821 fps | 98.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,834 psi | 50% | 1594 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 37,260 psi | 62% | 1742 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 25,425 psi | 42% | 1650 fps | 98.6% |
| Vihtavuori N130 | <<locked>> | 94% | 30,763 psi | 51% | 1749 fps | 95.1% |
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 42 powders for .458 x 2'' American loaded with the .458 | 400gr | Alaska Bullet Works Kodiak RN SPBC. ReloadSwiss RS 36 delivers the highest muzzle velocity at 2,034 fps; across all powders the maximum-charge window runs from 1,142 fps to 2,034 fps. Accurate 2015 gives the best case fill at 100 %, and 42 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (414 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate 2460, Accurate LT-30 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, Accurate 5744 rank at the top here: for .458 x 2'' American with the .458 | 400gr | Alaska Bullet Works Kodiak RN SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 2015, Accurate 2460, Accurate LT-32 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.