Load Specifications
Load data in caliber .450 Bushmaster with .451 | 300gr | Nosler Partition PP bullet and 11 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Lovex S053, Vihtavuori N110 and Vihtavuori N120.
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 No. 11 FS | <<locked>> | 82% | 34,287 psi | 88% | 1965 fps | 97.4% |
| ADI AR 2205 | <<locked>> | 84% | 34,969 psi | 89% | 1909 fps | 98.9% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 32,750 psi | 84% | 2034 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,628 psi | 65% | 1263 fps | 100% |
| IMR 4227 | <<locked>> | 92% | 35,085 psi | 90% | 1975 fps | 96% |
| Lovex S053 | <<locked>> | 94% | 34,708 psi | 89% | 1991 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,584 psi | 63% | 1293 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 94% | 35,041 psi | 89% | 2021 fps | 95.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 34,418 psi | 88% | 1903 fps | 100% |
| Vihtavuori N110 | <<locked>> | 88% | 34,606 psi | 88% | 1959 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 33,417 psi | 85% | 2014 fps | 98.2% |
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 No. 11 FS | <<locked>> | 80% | 32,024 psi | 82% | 1926 fps | 96.8% |
| ADI AR 2205 | <<locked>> | 80% | 30,995 psi | 79% | 1844 fps | 98.1% |
| ADI AR 2207 | <<locked>> | 96% | 28,819 psi | 74% | 1959 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,173 psi | 46% | 1125 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 32,982 psi | 84% | 1939 fps | 95.3% |
| Lovex S053 | 31.4 gr | 80% | 22,669 psi | 58% | 1749 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,347 psi | 44% | 1148 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 32,808 psi | 84% | 1982 fps | 95.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 21,930 psi | 56% | 1677 fps | 99.9% |
| Vihtavuori N110 | 30 gr | 80% | 26,948 psi | 69% | 1827 fps | 100% |
| Vihtavuori N120 | 37.7 gr | 92% | 26,223 psi | 67% | 1873 fps | 95.7% |
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 18 powders for .450 Bushmaster loaded with the .451 | 300gr | Nosler Partition PP. ADI AR 2207 delivers the highest muzzle velocity at 2,034 fps; across all powders the maximum-charge window runs from 1,263 fps to 2,034 fps. ADI AR 2207 gives the best case fill at 100 %, and 18 of the 18 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 63–90 %, leaving at least 10 % headroom. ADI AR 2207, Alliant Reloder-7, Hodgdon TrailBoss 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. Lovex S053, Vihtavuori N110, Vihtavuori N120 rank at the top here: for .450 Bushmaster with the .451 | 300gr | Nosler Partition PP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 1680, Alliant Reloder-7, IMR 4198 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.