Load Specifications
Load data in caliber .450 Bushmaster with .452 | 300gr | Rim Rock SWC 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 N120 and SNPE Vectan BA6 1/2.
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% | 35,302 psi | 90% | 1995 fps | 97.9% |
| ADI AR 2205 | <<locked>> | 82% | 33,678 psi | 86% | 1903 fps | 98.9% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 33,576 psi | 86% | 2064 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,904 psi | 66% | 1276 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 33,707 psi | 86% | 1965 fps | 95.8% |
| Lovex S053 | <<locked>> | 92% | 33,678 psi | 86% | 1985 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,642 psi | 63% | 1299 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 33,866 psi | 86% | 2014 fps | 95.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 35,302 psi | 90% | 1923 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 33,431 psi | 85% | 1949 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 34,229 psi | 87% | 2044 fps | 98.6% |
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% | 32,996 psi | 84% | 1955 fps | 97.3% |
| ADI AR 2205 | <<locked>> | 80% | 31,502 psi | 80% | 1864 fps | 98.4% |
| ADI AR 2207 | <<locked>> | 94% | 27,934 psi | 71% | 1952 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,347 psi | 47% | 1135 fps | 100% |
| IMR 4227 | <<locked>> | 88% | 31,734 psi | 81% | 1929 fps | 95.1% |
| Lovex S053 | 32.3 gr | 80% | 23,438 psi | 60% | 1778 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,738 psi | 45% | 1165 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 31,720 psi | 81% | 1975 fps | 95.1% |
| SNPE Vectan BA6 1/2 | 29.5 gr | 80% | 22,423 psi | 57% | 1696 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 27,731 psi | 71% | 1854 fps | 100% |
| Vihtavuori N120 | 37.8 gr | 90% | 25,251 psi | 64% | 1864 fps | 95.5% |
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 .452 | 300gr | Rim Rock SWC. ADI AR 2207 delivers the highest muzzle velocity at 2,064 fps; across all powders the maximum-charge window runs from 1,276 fps to 2,064 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, Hodgdon TrailBoss, IMR 4198 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 N120, SNPE Vectan BA6 1/2 rank at the top here: for .450 Bushmaster with the .452 | 300gr | Rim Rock SWC 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.