Load Specifications
Load data in caliber .25 ACP with .251 | 50gr | Prvi Partizan FMJ-RN bullet and 19 powders. The key underlying parameters are shown in the table above.
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: 2.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1000*² | <<locked>> | 72% | 13,358 psi | 77% | 702 fps | 88.9% |
| ADI APS 350² | <<locked>> | 64% | 14,721 psi | 85% | 692 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 14,286 psi | 82% | 702 fps | 99.4% |
| ADI AS 30² | <<locked>> | 76% | 14,330 psi | 82% | 732 fps | 95.7% |
| ADI AS 50N*² | <<locked>> | 72% | 14,170 psi | 81% | 735 fps | 88.9% |
| Alliant Green Dot*² | <<locked>> | 76% | 13,967 psi | 80% | 732 fps | 88.8% |
| Alliant RED DOT* | <<locked>> | 80% | 13,996 psi | 80% | 738 fps | 94.6% |
| Baschieri & Pellagri 102 Pistol*ᴾ | <<locked>> | 100% | 12,067 psi | 69% | 715 fps | 85.8% |
| Baschieri & Pellagri 103 Pistol* | <<locked>> | 80% | 14,402 psi | 83% | 764 fps | 87.9% |
| Hodgdon Clays² | <<locked>> | 72% | 13,416 psi | 77% | 686 fps | 98.8% |
| Maxam CSB 2* | <<locked>> | 96% | 13,880 psi | 80% | 797 fps | 87.4% |
| Maxam CSB 4*² | <<locked>> | 76% | 13,474 psi | 77% | 728 fps | 89.6% |
| Maxam CSB 5² | <<locked>> | 72% | 13,808 psi | 79% | 738 fps | 97.6% |
| ReloadSwiss RS 12* | <<locked>> | 88% | 15,476 psi | 89% | 837 fps | 93.1% |
| Rottweil P 801² | <<locked>> | 76% | 15,722 psi | 90% | 820 fps | 96.2% |
| SNPE Vectan BA10² | <<locked>> | 64% | 14,272 psi | 82% | 702 fps | 99.4% |
| Vihtavuori N310² | <<locked>> | 64% | 15,461 psi | 89% | 768 fps | 100% |
| Vihtavuori N320* | <<locked>> | 84% | 15,679 psi | 90% | 801 fps | 92.4% |
| Vihtavuori N32C Tin Star*ᴾ | <<locked>> | 100% | 9,587 psi | 55% | 656 fps | 93% |
Start Load - Barrel Length: 2.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1000*² | <<locked>> | 60% | 11,182 psi | 64% | 646 fps | 85.5% |
| ADI APS 350² | <<locked>> | 60% | 14,721 psi | 85% | 692 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 11,777 psi | 68% | 646 fps | 97.9% |
| ADI AS 30*² | <<locked>> | 60% | 9,950 psi | 57% | 623 fps | 89.9% |
| ADI AS 50N*² | <<locked>> | 64% | 11,995 psi | 69% | 686 fps | 85.8% |
| Alliant Green Dot*² | <<locked>> | 68% | 11,893 psi | 68% | 682 fps | 85.7% |
| Alliant RED DOT*² | <<locked>> | 60% | 9,616 psi | 55% | 627 fps | 88.1% |
| Baschieri & Pellagri 102 Pistol* | <<locked>> | 96% | 12,067 psi | 69% | 715 fps | 85.8% |
| Baschieri & Pellagri 103 Pistol*² | <<locked>> | 76% | 12,691 psi | 73% | 725 fps | 85.3% |
| Hodgdon Clays² | <<locked>> | 60% | 11,124 psi | 64% | 633 fps | 96.9% |
| Maxam CSB 2* | <<locked>> | 92% | 13,880 psi | 80% | 797 fps | 87.4% |
| Maxam CSB 4*² | <<locked>> | 68% | 11,356 psi | 65% | 676 fps | 86.3% |
| Maxam CSB 5² | <<locked>> | 60% | 11,429 psi | 66% | 679 fps | 95.2% |
| ReloadSwiss RS 12*² | <<locked>> | 72% | 11,298 psi | 65% | 738 fps | 87.1% |
| Rottweil P 801*² | <<locked>> | 60% | 9,587 psi | 55% | 669 fps | 87.7% |
| SNPE Vectan BA10² | <<locked>> | 60% | 14,272 psi | 82% | 702 fps | 99.4% |
| Vihtavuori N310² | <<locked>> | 60% | 15,461 psi | 89% | 768 fps | 100% |
| Vihtavuori N320*² | <<locked>> | 68% | 11,211 psi | 64% | 692 fps | 85.9% |
| Vihtavuori N32C Tin Star* | <<locked>> | 80% | 6,991 psi | 40% | 564 fps | 86.2% |
* 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 19 powders for .25 ACP loaded with the .251 | 50gr | Prvi Partizan FMJ-RN. ReloadSwiss RS 12 delivers the highest muzzle velocity at 837 fps; across all powders the maximum-charge window runs from 656 fps to 837 fps. Baschieri & Pellagri 102 Pistol gives the best case fill at 100 %, and 7 of the 19 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (120 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. Baschieri & Pellagri 102 Pistol, Vihtavuori N32C Tin Star 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. As outliers, Accurate Solo 1000, ADI AS 50N, Alliant Green Dot burn incompletely and react more sensitively to barrel length and temperature. Accurate Solo 1000, ADI APS 350, ADI APS 450 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.