Load Specifications
Load data in caliber .450 Bushmaster with .452 | 300gr | Swift A-Frame bullet and 10 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AR 2207, Vihtavuori N120 and Lovex S053.
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 |
|---|---|---|---|---|---|---|
| ADI AR 2205 | <<locked>> | 82% | 34,795 psi | 89% | 1942 fps | 99.3% |
| ADI AR 2207ᴾ | <<locked>> | 100% | 35,360 psi | 90% | 2119 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 26,165 psi | 67% | 1293 fps | 100% |
| IMR 4227 | <<locked>> | 90% | 35,288 psi | 90% | 2014 fps | 96.7% |
| Lovex S053 | <<locked>> | 92% | 35,099 psi | 90% | 2031 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 25,150 psi | 64% | 1322 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 92% | 35,302 psi | 90% | 2060 fps | 96.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 94% | 34,867 psi | 89% | 1936 fps | 100% |
| Vihtavuori N110 | <<locked>> | 86% | 35,041 psi | 89% | 1991 fps | 100% |
| Vihtavuori N120 | <<locked>> | 98% | 33,794 psi | 86% | 2057 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% | 32,677 psi | 83% | 1906 fps | 98.9% |
| ADI AR 2207 | 39.5 gr | 90% | 25,889 psi | 66% | 1926 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 18,811 psi | 48% | 1158 fps | 100% |
| IMR 4227 | <<locked>> | 86% | 31,212 psi | 80% | 1942 fps | 95.4% |
| Lovex S053 | 33.7 gr | 80% | 24,453 psi | 62% | 1821 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 17,999 psi | 46% | 1181 fps | 100% |
| ReloadSwiss RS 36 | <<locked>> | 88% | 31,096 psi | 79% | 1985 fps | 95.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 23,395 psi | 60% | 1736 fps | 100% |
| Vihtavuori N110 | <<locked>> | 80% | 29,124 psi | 74% | 1893 fps | 100% |
| Vihtavuori N120 | 37.7 gr | 86% | 23,351 psi | 60% | 1834 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 17 powders for .450 Bushmaster loaded with the .452 | 300gr | Swift A-Frame. ADI AR 2207 delivers the highest muzzle velocity at 2,119 fps; across all powders the maximum-charge window runs from 1,293 fps to 2,119 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 64–90 %, 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. ADI AR 2207, Vihtavuori N120, Lovex S053 rank at the top here: for .450 Bushmaster with the .452 | 300gr | 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.