Load Specifications
Load data in caliber .45 Auto Rim with .452 | 250gr | Rim Rock RNFP BP Lube 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.
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Max Load - Barrel Length: 5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Alliant Herco² | <<locked>> | 68% | 14,576 psi | 84% | 837 fps | 95.9% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 72% | 15,606 psi | 90% | 820 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 13,111 psi | 75% | 732 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,821 psi | 68% | 728 fps | 100% |
| Rottweil P 806*² | <<locked>> | 76% | 15,360 psi | 88% | 955 fps | 88.4% |
| Vihtavuori 3N37*² | <<locked>> | 64% | 15,737 psi | 90% | 879 fps | 90.3% |
| Vihtavuori N32C Tin Star² | <<locked>> | 76% | 14,489 psi | 83% | 748 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 68% | 15,360 psi | 88% | 869 fps | 90.4% |
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% | 11,748 psi | 68% | 761 fps | 92.8% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,168 psi | 64% | 728 fps | 100% |
| Hodgdon TrailBoss² | 3.2 gr | 60% | 6,193 psi | 36% | 538 fps | 98.7% |
| ReloadSwiss RS 14*² | 3.2 gr | 60% | 5,700 psi | 33% | 525 fps | 94.2% |
| Rottweil P 806*² | <<locked>> | 72% | 13,489 psi | 78% | 909 fps | 85.9% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 13,779 psi | 79% | 830 fps | 87.9% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,935 psi | 57% | 653 fps | 100% |
| Vihtavuori N350*² | <<locked>> | 60% | 12,024 psi | 69% | 784 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 .452 | 250gr | Rim Rock RNFP BP Lube. Hodgdon TrailBoss delivers the highest muzzle velocity at 732 fps; across all powders the maximum-charge window runs from 728 fps to 732 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 68–75 %, leaving at least 25 % 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 .452 | 250gr | Rim Rock RNFP BP Lube 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.