Load Specifications
Load data in caliber .45 Auto Rim with .451 | 230gr | Speer TMJ bullet and 8 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon TrailBoss and ReloadSwiss RS 14.
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 ≥ 60% and propellant combustion ≥ 80%. 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: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Alliant Herco² | <<locked>> | 72% | 15,403 psi | 89% | 896 fps | 95.5% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 72% | 14,837 psi | 85% | 850 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,169 psi | 70% | 751 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,994 psi | 63% | 748 fps | 99.8% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 15,040 psi | 86% | 909 fps | 97.3% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 14,852 psi | 85% | 899 fps | 87.7% |
| Vihtavuori N32C Tin Star | <<locked>> | 80% | 15,258 psi | 88% | 804 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,562 psi | 84% | 889 fps | 87.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Alliant Herco*² | <<locked>> | 60% | 11,255 psi | 65% | 784 fps | 90.6% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,718 psi | 62% | 755 fps | 99.9% |
| Hodgdon TrailBoss² | 3.2 gr | 60% | 5,816 psi | 33% | 551 fps | 97.3% |
| ReloadSwiss RS 14*² | 3.3 gr | 60% | 5,555 psi | 32% | 545 fps | 92.5% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 13,431 psi | 77% | 866 fps | 95.9% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 13,068 psi | 75% | 853 fps | 85.3% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,239 psi | 53% | 673 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 64% | 13,126 psi | 75% | 853 fps | 85.7% |
Recommended = one of the top powders for this cartridge and bullet combination.
* not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
² fill rate low - you might want to consider using a filler to ensure proper ignition.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 2 powders for .45 Auto Rim loaded with the .451 | 230gr | Speer TMJ. Hodgdon TrailBoss delivers the highest muzzle velocity at 751 fps; across all powders the maximum-charge window runs from 748 fps to 751 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 2 of the 2 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (120 MPa), the top charges use 63–70 %, leaving at least 30 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14 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. Hodgdon TrailBoss, ReloadSwiss RS 14 rank at the top here: for .45 Auto Rim with the .451 | 230gr | Speer TMJ they combine a high case fill with complete burn and sit in the upper velocity band. 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.