Load Specifications
Load data in caliber .25 ACP with .251 | 50gr | Sierra FMJ RN SportsMaster 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>> | 76% | 15,490 psi | 89% | 751 fps | 91.7% |
| ADI APS 350² | <<locked>> | 64% | 14,460 psi | 83% | 692 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 14,040 psi | 81% | 699 fps | 99.3% |
| ADI AS 30² | <<locked>> | 76% | 14,098 psi | 81% | 728 fps | 95.6% |
| ADI AS 50N*² | <<locked>> | 72% | 13,982 psi | 80% | 732 fps | 88.8% |
| Alliant Green Dot*² | <<locked>> | 76% | 13,779 psi | 79% | 732 fps | 88.7% |
| Alliant RED DOT*² | <<locked>> | 76% | 13,764 psi | 79% | 738 fps | 94.5% |
| Baschieri & Pellagri 100* | <<locked>> | 84% | 15,679 psi | 90% | 764 fps | 88.7% |
| Baschieri & Pellagri 102 Pistol*ᴾ | <<locked>> | 100% | 13,619 psi | 78% | 755 fps | 88.5% |
| Baschieri & Pellagri 103 Pistol*² | <<locked>> | 76% | 14,083 psi | 81% | 761 fps | 87.7% |
| Hodgdon Clays² | <<locked>> | 72% | 13,198 psi | 76% | 682 fps | 98.7% |
| Maxam CSB 3* | <<locked>> | 80% | 13,561 psi | 78% | 735 fps | 86% |
| Maxam CSB 4* | <<locked>> | 80% | 15,635 psi | 90% | 778 fps | 92.3% |
| Maxam CSB 5² | <<locked>> | 72% | 13,619 psi | 78% | 735 fps | 97.6% |
| ReloadSwiss RS 12* | <<locked>> | 84% | 15,200 psi | 87% | 833 fps | 92.9% |
| Rottweil P 801² | <<locked>> | 76% | 15,447 psi | 89% | 814 fps | 96% |
| Vihtavuori N310² | <<locked>> | 64% | 15,142 psi | 87% | 764 fps | 100% |
| Vihtavuori N320* | <<locked>> | 84% | 15,461 psi | 89% | 797 fps | 92.3% |
| Vihtavuori N32C Tin Star*ᴾ | <<locked>> | 100% | 9,442 psi | 54% | 653 fps | 92.9% |
Start Load - Barrel Length: 2.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1000*² | <<locked>> | 60% | 10,979 psi | 63% | 646 fps | 85.3% |
| ADI APS 350² | <<locked>> | 60% | 14,460 psi | 83% | 692 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 11,589 psi | 67% | 646 fps | 97.8% |
| ADI AS 30*² | <<locked>> | 60% | 9,819 psi | 56% | 620 fps | 89.8% |
| ADI AS 50N*² | <<locked>> | 64% | 11,864 psi | 68% | 682 fps | 85.6% |
| Alliant Green Dot*² | <<locked>> | 64% | 11,690 psi | 67% | 679 fps | 85.5% |
| Alliant RED DOT*² | <<locked>> | 60% | 9,500 psi | 55% | 623 fps | 88% |
| Baschieri & Pellagri 100*² | <<locked>> | 76% | 13,402 psi | 77% | 715 fps | 85.8% |
| Baschieri & Pellagri 102 Pistol* | <<locked>> | 96% | 11,835 psi | 68% | 709 fps | 85.6% |
| Baschieri & Pellagri 103 Pistol*² | <<locked>> | 72% | 12,444 psi | 72% | 725 fps | 85.2% |
| Hodgdon Clays² | <<locked>> | 60% | 10,921 psi | 63% | 630 fps | 96.8% |
| Maxam CSB 3*² | <<locked>> | 76% | 13,561 psi | 78% | 735 fps | 86% |
| Maxam CSB 4*² | <<locked>> | 64% | 11,139 psi | 64% | 673 fps | 86.1% |
| Maxam CSB 5² | <<locked>> | 60% | 11,255 psi | 65% | 679 fps | 95.1% |
| ReloadSwiss RS 12*² | <<locked>> | 72% | 11,110 psi | 64% | 735 fps | 86.9% |
| Rottweil P 801*² | <<locked>> | 60% | 9,471 psi | 54% | 666 fps | 87.5% |
| Vihtavuori N310² | <<locked>> | 60% | 15,142 psi | 87% | 764 fps | 100% |
| Vihtavuori N320*² | <<locked>> | 68% | 10,994 psi | 63% | 689 fps | 85.6% |
| Vihtavuori N32C Tin Star* | <<locked>> | 80% | 6,933 psi | 40% | 564 fps | 86.1% |
* 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 | Sierra FMJ RN SportsMaster. ReloadSwiss RS 12 delivers the highest muzzle velocity at 833 fps; across all powders the maximum-charge window runs from 653 fps to 833 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 54–90 %, 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.