Load Specifications
Load data in caliber .450 Bushmaster with .451 | 325gr | Rim Rock LBT?WFN 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 11 FS | <<locked>> | 82% | 35,027 psi | 89% | 1880 fps | 98.1% |
| ADI AR 2205 | <<locked>> | 82% | 33,460 psi | 85% | 1791 fps | 99% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 33,489 psi | 86% | 1949 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,802 psi | 66% | 1194 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 33,808 psi | 86% | 1857 fps | 96.2% |
| Lovex S053 | <<locked>> | 92% | 33,562 psi | 86% | 1873 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,845 psi | 63% | 1220 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 33,736 psi | 86% | 1903 fps | 96.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 96% | 35,404 psi | 90% | 1814 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 33,388 psi | 85% | 1837 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 34,084 psi | 87% | 1929 fps | 98.8% |
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% | 32,909 psi | 84% | 1847 fps | 97.6% |
| ADI AR 2205 | <<locked>> | 80% | 31,647 psi | 81% | 1762 fps | 98.7% |
| ADI AR 2207 | <<locked>> | 92% | 26,223 psi | 67% | 1811 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,478 psi | 47% | 1066 fps | 100% |
| IMR 4227 | <<locked>> | 88% | 31,705 psi | 81% | 1821 fps | 95.5% |
| Lovex S053 | 30 gr | 80% | 23,308 psi | 60% | 1677 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,695 psi | 45% | 1089 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 31,734 psi | 81% | 1867 fps | 95.5% |
| SNPE Vectan BA6 1/2 | 27.5 gr | 80% | 22,495 psi | 57% | 1601 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 27,818 psi | 71% | 1749 fps | 100% |
| Vihtavuori N120 | 34.4 gr | 88% | 23,728 psi | 61% | 1726 fps | 95.1% |
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 | 325gr | Rim Rock LBT?WFN Gas Check. ADI AR 2207 delivers the highest muzzle velocity at 1,949 fps; across all powders the maximum-charge window runs from 1,194 fps to 1,949 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 .451 | 325gr | Rim Rock LBT?WFN 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.