Load Specifications
Load data in caliber .450 Marlin with .458 | 400gr | Speer Soft Point Flat Nose bullet and 21 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Norma 200 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>> | 92% | 43,091 psi | 90% | 1903 fps | 98.3% |
| ADI AR 2205 | <<locked>> | 82% | 42,366 psi | 89% | 1808 fps | 100% |
| ADI AR 2207 | <<locked>> | 98% | 42,960 psi | 90% | 1975 fps | 100% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 30,618 psi | 64% | 1827 fps | 96.2% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 37,289 psi | 78% | 1923 fps | 97.6% |
| Alliant Reloder-7 | <<locked>> | 96% | 43,091 psi | 90% | 1942 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,182 psi | 61% | 1152 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 41,568 psi | 87% | 1919 fps | 98.9% |
| IMR 4227 | <<locked>> | 88% | 41,191 psi | 86% | 1867 fps | 99.7% |
| Lovex D060 | <<locked>> | 82% | 42,395 psi | 89% | 1890 fps | 98.9% |
| Lovex D063 | <<locked>> | 82% | 41,989 psi | 88% | 1873 fps | 99.3% |
| Lovex S053 | <<locked>> | 90% | 41,800 psi | 87% | 1870 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 42,366 psi | 89% | 1985 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,631 psi | 60% | 1178 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 42,090 psi | 88% | 1919 fps | 99.7% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 42,395 psi | 89% | 1890 fps | 98.9% |
| Shooters World SOCOM | <<locked>> | 82% | 41,989 psi | 88% | 1873 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 43,221 psi | 90% | 1778 fps | 100% |
| Vihtavuori N110 | <<locked>> | 84% | 41,945 psi | 88% | 1811 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 43,250 psi | 90% | 1942 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 36,724 psi | 77% | 1857 fps | 97% |
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% | 31,386 psi | 66% | 1729 fps | 95.5% |
| ADI AR 2205 | <<locked>> | 80% | 39,711 psi | 83% | 1775 fps | 100% |
| ADI AR 2207 | 35.5 gr | 80% | 25,063 psi | 52% | 1680 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 98% | 28,732 psi | 60% | 1788 fps | 95.3% |
| Alliant Reloder-10x | <<locked>> | 92% | 29,356 psi | 61% | 1785 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 82% | 28,398 psi | 59% | 1706 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,350 psi | 45% | 1027 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 28,311 psi | 59% | 1696 fps | 95.2% |
| IMR 4227 | <<locked>> | 80% | 32,430 psi | 68% | 1736 fps | 98.4% |
| Lovex D060 | <<locked>> | 80% | 39,987 psi | 84% | 1857 fps | 98.6% |
| Lovex D063 | <<locked>> | 80% | 39,349 psi | 82% | 1837 fps | 98.9% |
| Lovex S053 | <<locked>> | 80% | 31,560 psi | 66% | 1722 fps | 99.9% |
| Norma 200 | 40 gr | 86% | 27,601 psi | 58% | 1745 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 21,074 psi | 44% | 1053 fps | 100% |
| ReloadSwiss RS 36 | 37 gr | 80% | 31,096 psi | 65% | 1749 fps | 97.9% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 39,987 psi | 84% | 1857 fps | 98.6% |
| Shooters World SOCOM | <<locked>> | 80% | 39,349 psi | 82% | 1837 fps | 98.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 30,066 psi | 63% | 1608 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 37,449 psi | 78% | 1755 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 25,483 psi | 53% | 1663 fps | 98.6% |
| Vihtavuori N130 | <<locked>> | 94% | 30,806 psi | 64% | 1759 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 36 powders for .450 Marlin loaded with the .458 | 400gr | Speer Soft Point Flat Nose. Norma 200 delivers the highest muzzle velocity at 1,985 fps; across all powders the maximum-charge window runs from 1,152 fps to 1,985 fps. Accurate 2015 gives the best case fill at 100 %, and 36 of the 36 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. Accurate 2015, Accurate 2460, ADI AR 2219 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. ADI AR 2207, Norma 200, ReloadSwiss RS 36 rank at the top here: for .450 Marlin 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 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.