Load Specifications
Load data in caliber .450 Bushmaster with .452 | 325gr | Swift A-Frame 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% | 34,998 psi | 89% | 1877 fps | 98% |
| ADI AR 2205 | <<locked>> | 82% | 33,344 psi | 85% | 1785 fps | 99% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 33,199 psi | 85% | 1942 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,759 psi | 66% | 1191 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 33,446 psi | 85% | 1847 fps | 96% |
| Lovex S053 | <<locked>> | 94% | 35,331 psi | 90% | 1896 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,816 psi | 63% | 1217 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 33,460 psi | 85% | 1893 fps | 96% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 34,998 psi | 89% | 1808 fps | 100% |
| Vihtavuori N110 | <<locked>> | 88% | 35,288 psi | 90% | 1860 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 33,794 psi | 86% | 1919 fps | 98.7% |
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% | 32,532 psi | 83% | 1837 fps | 97.4% |
| ADI AR 2205 | <<locked>> | 80% | 31,299 psi | 80% | 1752 fps | 98.6% |
| ADI AR 2207 | <<locked>> | 94% | 27,644 psi | 71% | 1837 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,376 psi | 47% | 1063 fps | 100% |
| IMR 4227 | <<locked>> | 88% | 31,647 psi | 81% | 1818 fps | 95.4% |
| Lovex S053 | 29.8 gr | 80% | 23,163 psi | 59% | 1670 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,593 psi | 45% | 1086 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 31,415 psi | 80% | 1857 fps | 95.3% |
| SNPE Vectan BA6 1/2 | 27.3 gr | 80% | 22,336 psi | 57% | 1598 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 27,615 psi | 71% | 1742 fps | 100% |
| Vihtavuori N120 | 34.2 gr | 88% | 23,656 psi | 60% | 1719 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 18 powders for .450 Bushmaster loaded with the .452 | 325gr | Swift A-Frame. ADI AR 2207 delivers the highest muzzle velocity at 1,942 fps; across all powders the maximum-charge window runs from 1,191 fps to 1,942 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 | 325gr | Swift A-Frame 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. 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.