Load Specifications
Load data in caliber .450 Bushmaster with .452 | 300gr | Rim Rock TC bullet and 10 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 |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 82% | 34,200 psi | 87% | 1919 fps | 99.1% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 34,214 psi | 87% | 2083 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 25,933 psi | 66% | 1283 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 34,432 psi | 88% | 1988 fps | 96.2% |
| Lovex S053 | <<locked>> | 92% | 34,200 psi | 87% | 2001 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 24,932 psi | 64% | 1309 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 34,301 psi | 88% | 2031 fps | 96.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 34,113 psi | 87% | 1913 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 34,127 psi | 87% | 1969 fps | 100% |
| Vihtavuori N120ᴾ | <<locked>> | 100% | 34,824 psi | 89% | 2060 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 |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 80% | 32,039 psi | 82% | 1880 fps | 98.7% |
| ADI AR 2207 | <<locked>> | 92% | 26,716 psi | 68% | 1932 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,478 psi | 47% | 1142 fps | 100% |
| IMR 4227 | <<locked>> | 88% | 32,227 psi | 82% | 1946 fps | 95.5% |
| Lovex S053 | 32.8 gr | 80% | 23,772 psi | 61% | 1791 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,869 psi | 46% | 1171 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 90% | 32,155 psi | 82% | 1991 fps | 95.4% |
| SNPE Vectan BA6 1/2 | 30 gr | 80% | 22,800 psi | 58% | 1713 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 28,181 psi | 72% | 1867 fps | 100% |
| Vihtavuori N120 | 37.6 gr | 88% | 24,221 psi | 62% | 1844 fps | 95.2% |
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 17 powders for .450 Bushmaster loaded with the .452 | 300gr | Rim Rock TC. ADI AR 2207 delivers the highest muzzle velocity at 2,083 fps; across all powders the maximum-charge window runs from 1,283 fps to 2,083 fps. ADI AR 2207 gives the best case fill at 100 %, and 17 of the 17 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (270 MPa), the top charges use 64–89 %, leaving at least 11 % 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 TC 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.