Load Specifications
Load data in caliber .450 Marlin with .458 | 405gr | CamPro FCP RNFP 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, ReloadSwiss RS 36 and Norma 200.
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% | 42,772 psi | 89% | 1877 fps | 98.2% |
| ADI AR 2205 | <<locked>> | 82% | 41,930 psi | 88% | 1781 fps | 100% |
| ADI AR 2207 | <<locked>> | 98% | 42,743 psi | 89% | 1949 fps | 100% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 30,356 psi | 63% | 1801 fps | 96.1% |
| Alliant Reloder-10xᴾ | <<locked>> | 100% | 36,825 psi | 77% | 1893 fps | 97.5% |
| Alliant Reloder-7 | <<locked>> | 96% | 42,960 psi | 90% | 1916 fps | 98.9% |
| Baschieri & Pellagri 106ᴾ | <<locked>> | 100% | 43,279 psi | 90% | 1893 fps | 96% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 29,153 psi | 61% | 1135 fps | 100% |
| IMR 4198ᴾ | <<locked>> | 100% | 41,350 psi | 86% | 1896 fps | 98.9% |
| IMR 4227 | <<locked>> | 88% | 40,770 psi | 85% | 1837 fps | 99.6% |
| Lovex D060 | <<locked>> | 82% | 42,192 psi | 88% | 1867 fps | 98.9% |
| Lovex S053 | <<locked>> | 90% | 41,611 psi | 87% | 1844 fps | 100% |
| Norma 200ᴾ | <<locked>> | 100% | 41,989 psi | 88% | 1955 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 28,616 psi | 60% | 1161 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 41,814 psi | 87% | 1893 fps | 99.7% |
| Shooters World Buffalo Rifle | <<locked>> | 82% | 42,192 psi | 88% | 1867 fps | 98.9% |
| Shooters World SOCOM | <<locked>> | 82% | 41,684 psi | 87% | 1847 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 42,989 psi | 90% | 1755 fps | 100% |
| Vihtavuori N110 | <<locked>> | 84% | 41,582 psi | 87% | 1785 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 43,047 psi | 90% | 1919 fps | 100% |
| Vihtavuori N130ᴾ | <<locked>> | 100% | 36,303 psi | 76% | 1831 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% | 31,125 psi | 65% | 1706 fps | 95.3% |
| ADI AR 2205 | <<locked>> | 80% | 39,450 psi | 82% | 1749 fps | 100% |
| ADI AR 2207 | 34.8 gr | 80% | 24,845 psi | 52% | 1654 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 98% | 28,645 psi | 60% | 1765 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 92% | 29,109 psi | 61% | 1762 fps | 95.1% |
| Alliant Reloder-7 | <<locked>> | 82% | 28,224 psi | 59% | 1683 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 98% | 40,785 psi | 85% | 1860 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 21,408 psi | 45% | 1014 fps | 100% |
| IMR 4198 | <<locked>> | 86% | 28,166 psi | 59% | 1673 fps | 95.2% |
| IMR 4227 | <<locked>> | 80% | 32,198 psi | 67% | 1709 fps | 98.3% |
| Lovex D060 | <<locked>> | 80% | 39,726 psi | 83% | 1831 fps | 98.5% |
| Lovex S053 | <<locked>> | 80% | 31,285 psi | 65% | 1696 fps | 99.9% |
| Norma 200 | 39.2 gr | 86% | 27,267 psi | 57% | 1719 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 20,900 psi | 44% | 1037 fps | 100% |
| ReloadSwiss RS 36 | 36.3 gr | 80% | 30,893 psi | 65% | 1726 fps | 97.9% |
| Shooters World Buffalo Rifle | <<locked>> | 80% | 39,726 psi | 83% | 1831 fps | 98.5% |
| Shooters World SOCOM | <<locked>> | 80% | 38,972 psi | 81% | 1811 fps | 98.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 29,834 psi | 62% | 1588 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 37,028 psi | 77% | 1729 fps | 100% |
| Vihtavuori N120 | <<locked>> | 80% | 25,280 psi | 53% | 1640 fps | 98.6% |
| Vihtavuori N130 | <<locked>> | 94% | 30,560 psi | 64% | 1736 fps | 95% |
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 21 powders for .450 Marlin loaded with the .458 | 405gr | CamPro FCP RNFP. Norma 200 delivers the highest muzzle velocity at 1,955 fps; across all powders the maximum-charge window runs from 1,135 fps to 1,955 fps. Alliant AR-Comp gives the best case fill at 100 %, and 21 of the 21 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. Alliant AR-Comp, Alliant Reloder-10x, Baschieri & Pellagri 106 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, ReloadSwiss RS 36, Norma 200 rank at the top here: for .450 Marlin with the .458 | 405gr | CamPro FCP RNFP they combine a high case fill with complete burn and sit in the upper velocity band. 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.