Load Specifications
Load data in caliber .25 ACP with .251 | 50gr | Speer TMJ bullet and 20 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% | 13,387 psi | 77% | 702 fps | 88.9% |
| ADI APS 350² | <<locked>> | 68% | 14,779 psi | 85% | 696 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 14,373 psi | 83% | 702 fps | 99.4% |
| ADI AS 30² | <<locked>> | 76% | 14,373 psi | 83% | 732 fps | 95.7% |
| ADI AS 50N*² | <<locked>> | 72% | 14,214 psi | 82% | 738 fps | 89% |
| Alliant Green Dot*² | <<locked>> | 76% | 14,054 psi | 81% | 735 fps | 88.9% |
| Alliant RED DOT* | <<locked>> | 80% | 14,040 psi | 81% | 738 fps | 94.6% |
| Baschieri & Pellagri 100* | <<locked>> | 80% | 13,677 psi | 79% | 719 fps | 86% |
| Baschieri & Pellagri 102 Pistol*ᴾ | <<locked>> | 100% | 12,125 psi | 70% | 715 fps | 85.9% |
| Baschieri & Pellagri 103 Pistol* | <<locked>> | 80% | 14,460 psi | 83% | 768 fps | 87.9% |
| Hodgdon Clays² | <<locked>> | 76% | 13,474 psi | 77% | 686 fps | 98.8% |
| Maxam CSB 2* | <<locked>> | 96% | 13,924 psi | 80% | 797 fps | 87.4% |
| Maxam CSB 4*² | <<locked>> | 76% | 13,532 psi | 78% | 728 fps | 89.6% |
| Maxam CSB 5² | <<locked>> | 72% | 13,924 psi | 80% | 738 fps | 97.7% |
| ReloadSwiss RS 12* | <<locked>> | 88% | 15,577 psi | 90% | 840 fps | 93.2% |
| Rottweil P 801*² | <<locked>> | 72% | 13,474 psi | 77% | 771 fps | 93.9% |
| SNPE Vectan BA10² | <<locked>> | 64% | 14,359 psi | 83% | 702 fps | 99.4% |
| Vihtavuori N310² | <<locked>> | 64% | 15,490 psi | 89% | 768 fps | 100% |
| Vihtavuori N320* | <<locked>> | 80% | 13,387 psi | 77% | 748 fps | 89.5% |
| Vihtavuori N32C Tin Star*ᴾ | <<locked>> | 100% | 9,631 psi | 55% | 656 fps | 93.1% |
Start Load - Barrel Length: 2.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1000*² | <<locked>> | 60% | 11,211 psi | 64% | 650 fps | 85.5% |
| ADI APS 350² | <<locked>> | 60% | 11,951 psi | 69% | 636 fps | 99.6% |
| ADI APS 450² | <<locked>> | 60% | 11,835 psi | 68% | 650 fps | 97.9% |
| ADI AS 30*² | <<locked>> | 60% | 9,993 psi | 57% | 623 fps | 89.9% |
| ADI AS 50N*² | <<locked>> | 64% | 12,053 psi | 69% | 686 fps | 85.7% |
| Alliant Green Dot*² | <<locked>> | 68% | 11,951 psi | 69% | 686 fps | 85.8% |
| Alliant RED DOT*² | <<locked>> | 60% | 9,660 psi | 56% | 627 fps | 88.1% |
| Baschieri & Pellagri 100*² | <<locked>> | 76% | 13,677 psi | 79% | 719 fps | 86% |
| Baschieri & Pellagri 102 Pistol* | <<locked>> | 96% | 12,125 psi | 70% | 715 fps | 85.9% |
| Baschieri & Pellagri 103 Pistol*² | <<locked>> | 76% | 12,734 psi | 73% | 728 fps | 85.4% |
| Hodgdon Clays*² | <<locked>> | 60% | 9,094 psi | 52% | 577 fps | 94.3% |
| Maxam CSB 2* | <<locked>> | 92% | 13,924 psi | 80% | 797 fps | 87.4% |
| Maxam CSB 4*² | <<locked>> | 68% | 11,371 psi | 65% | 676 fps | 86.3% |
| Maxam CSB 5² | <<locked>> | 60% | 11,443 psi | 66% | 682 fps | 95.2% |
| ReloadSwiss RS 12*² | <<locked>> | 72% | 11,342 psi | 65% | 738 fps | 87.2% |
| Rottweil P 801*² | <<locked>> | 60% | 9,631 psi | 55% | 669 fps | 87.8% |
| SNPE Vectan BA10² | <<locked>> | 60% | 14,359 psi | 83% | 702 fps | 99.4% |
| Vihtavuori N310² | <<locked>> | 60% | 15,490 psi | 89% | 768 fps | 100% |
| Vihtavuori N320*² | <<locked>> | 68% | 11,240 psi | 65% | 696 fps | 85.9% |
| Vihtavuori N32C Tin Star* | <<locked>> | 80% | 7,034 psi | 40% | 568 fps | 86.3% |
* 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 20 powders for .25 ACP loaded with the .251 | 50gr | Speer TMJ. ReloadSwiss RS 12 delivers the highest muzzle velocity at 840 fps; across all powders the maximum-charge window runs from 656 fps to 840 fps. Baschieri & Pellagri 102 Pistol gives the best case fill at 100 %, and 8 of the 20 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.