Load Specifications
Load data in caliber .450 Bushmaster with .452 | 325gr | Rim Rock LBT?LWN Gas Check 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% | 34,853 psi | 89% | 1873 fps | 98% |
| ADI AR 2205 | <<locked>> | 84% | 35,418 psi | 90% | 1818 fps | 99.3% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 33,315 psi | 85% | 1946 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,701 psi | 66% | 1191 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 33,634 psi | 86% | 1854 fps | 96.1% |
| Lovex S053 | <<locked>> | 92% | 33,301 psi | 85% | 1867 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,743 psi | 63% | 1217 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 33,344 psi | 85% | 1893 fps | 96% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 35,186 psi | 90% | 1811 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 33,431 psi | 85% | 1834 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 33,968 psi | 87% | 1923 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% | 32,721 psi | 84% | 1841 fps | 97.5% |
| ADI AR 2205 | <<locked>> | 80% | 31,444 psi | 80% | 1755 fps | 98.6% |
| ADI AR 2207 | <<locked>> | 92% | 26,092 psi | 67% | 1804 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,347 psi | 47% | 1063 fps | 100% |
| IMR 4227 | <<locked>> | 88% | 31,531 psi | 81% | 1814 fps | 95.4% |
| Lovex S053 | 29.9 gr | 80% | 23,264 psi | 59% | 1673 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,550 psi | 45% | 1086 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 31,314 psi | 80% | 1857 fps | 95.2% |
| SNPE Vectan BA6 1/2 | 27.3 gr | 80% | 22,307 psi | 57% | 1594 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 27,557 psi | 70% | 1742 fps | 100% |
| Vihtavuori N120 | 34.2 gr | 88% | 23,598 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 | Rim Rock LBT?LWN Gas Check. ADI AR 2207 delivers the highest muzzle velocity at 1,946 fps; across all powders the maximum-charge window runs from 1,191 fps to 1,946 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 | Rim Rock LBT?LWN Gas Check 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.