Load Specifications
Load data in caliber .380 ACP with .358 | 125gr | Rim Rock RNFP Cowboy bullet and 35 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Maxam CSB 2 and Vihtavuori N32C Tin Star.
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: 3.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1000² | <<locked>> | 72% | 16,070 psi | 82% | 735 fps | 97.9% |
| Accurate Solo 1250* | <<locked>> | 84% | 16,621 psi | 85% | 778 fps | 92% |
| ADI AP 70N*² | <<locked>> | 72% | 16,737 psi | 85% | 797 fps | 93.3% |
| ADI APS 350² | <<locked>> | 64% | 16,085 psi | 82% | 676 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 17,158 psi | 88% | 715 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 17,564 psi | 90% | 761 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 15,969 psi | 82% | 751 fps | 97.3% |
| Alliant BE-86* | <<locked>> | 84% | 16,505 psi | 84% | 787 fps | 94.9% |
| Alliant Green Dot² | <<locked>> | 76% | 17,100 psi | 87% | 774 fps | 98.1% |
| Alliant RED DOT | <<locked>> | 80% | 17,303 psi | 88% | 774 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 15,461 psi | 79% | 735 fps | 95.5% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 14,866 psi | 76% | 761 fps | 97.3% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 80% | 17,695 psi | 90% | 810 fps | 98% |
| Hodgdon Clays² | <<locked>> | 76% | 16,128 psi | 82% | 702 fps | 100% |
| Hodgdon TrailBoss*ᴾ | <<locked>> | 100% | 6,759 psi | 35% | 535 fps | 89.2% |
| Hodgdon Universal*² | <<locked>> | 76% | 15,577 psi | 80% | 774 fps | 92.2% |
| Lovex S011*² | <<locked>> | 64% | 15,998 psi | 82% | 738 fps | 93.1% |
| Maxam CSB 1* | <<locked>> | 88% | 16,969 psi | 87% | 781 fps | 92.5% |
| Maxam CSB 2 | <<locked>> | 92% | 16,636 psi | 85% | 837 fps | 97.9% |
| Maxam CSB 3 | <<locked>> | 80% | 16,984 psi | 87% | 781 fps | 96.7% |
| Maxam CSB 4² | <<locked>> | 76% | 16,592 psi | 85% | 768 fps | 98.5% |
| Maxam CSB 5² | <<locked>> | 72% | 17,289 psi | 88% | 764 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 80% | 17,448 psi | 89% | 846 fps | 99.6% |
| ReloadSwiss RS 20* | <<locked>> | 92% | 17,172 psi | 88% | 817 fps | 86.9% |
| Rottweil P 801² | <<locked>> | 72% | 17,332 psi | 89% | 814 fps | 100% |
| SNPE Vectan A1*² | <<locked>> | 76% | 17,202 psi | 88% | 771 fps | 94.3% |
| SNPE Vectan BA 9*² | <<locked>> | 76% | 16,476 psi | 84% | 755 fps | 89.1% |
| SNPE Vectan BA10² | <<locked>> | 64% | 17,143 psi | 88% | 715 fps | 100% |
| SNPE Vectan BA9 1/2* | <<locked>> | 80% | 17,419 psi | 89% | 794 fps | 92.4% |
| Somchem MS200* | <<locked>> | 84% | 17,492 psi | 89% | 791 fps | 86.7% |
| Vihtavuori N320² | <<locked>> | 76% | 15,432 psi | 79% | 771 fps | 98.2% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 11,342 psi | 58% | 676 fps | 99.9% |
| Vihtavuori N330* | <<locked>> | 84% | 17,289 psi | 88% | 823 fps | 94.5% |
| Winchester 231*² | <<locked>> | 64% | 16,215 psi | 83% | 764 fps | 93.1% |
| Winchester AutoComp * | <<locked>> | 88% | 17,071 psi | 87% | 797 fps | 91% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 3.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate Solo 1000*² | <<locked>> | 60% | 12,328 psi | 63% | 659 fps | 94.7% |
| Accurate Solo 1250*² | <<locked>> | 72% | 12,067 psi | 62% | 682 fps | 86.3% |
| ADI AP 70N*² | <<locked>> | 60% | 12,444 psi | 64% | 705 fps | 88.2% |
| ADI APS 350² | <<locked>> | 60% | 14,504 psi | 74% | 650 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 14,228 psi | 73% | 669 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 12,299 psi | 63% | 659 fps | 98.7% |
| ADI AS 50N*² | <<locked>> | 60% | 12,444 psi | 64% | 676 fps | 94% |
| Alliant BE-86*² | <<locked>> | 64% | 9,819 psi | 50% | 640 fps | 86.2% |
| Alliant Green Dot*² | <<locked>> | 60% | 11,255 psi | 57% | 650 fps | 92.6% |
| Alliant RED DOT² | <<locked>> | 60% | 10,921 psi | 56% | 643 fps | 97% |
| Baschieri & Pellagri 100*² | <<locked>> | 60% | 10,066 psi | 51% | 617 fps | 88.6% |
| Baschieri & Pellagri 102 Pistol*² | <<locked>> | 72% | 8,296 psi | 42% | 597 fps | 87.8% |
| Baschieri & Pellagri 103 Pistol*² | <<locked>> | 60% | 9,877 psi | 50% | 646 fps | 89.7% |
| Hodgdon Clays² | <<locked>> | 60% | 11,008 psi | 56% | 604 fps | 99.9% |
| Hodgdon TrailBoss* | <<locked>> | 88% | 5,744 psi | 29% | 492 fps | 85.8% |
| Hodgdon Universal*² | <<locked>> | 60% | 10,617 psi | 54% | 656 fps | 85.1% |
| Lovex S011*² | <<locked>> | 60% | 14,750 psi | 75% | 715 fps | 91.9% |
| Maxam CSB 1*² | <<locked>> | 72% | 11,574 psi | 59% | 669 fps | 85.7% |
| Maxam CSB 2*² | 2.1 gr | 64% | 8,137 psi | 42% | 620 fps | 85.7% |
| Maxam CSB 3*² | <<locked>> | 60% | 10,283 psi | 53% | 633 fps | 89% |
| Maxam CSB 4*² | <<locked>> | 60% | 10,689 psi | 55% | 643 fps | 93.2% |
| Maxam CSB 5² | <<locked>> | 60% | 11,792 psi | 60% | 663 fps | 99.7% |
| ReloadSwiss RS 12*² | <<locked>> | 60% | 9,776 psi | 50% | 679 fps | 93.4% |
| ReloadSwiss RS 20* | <<locked>> | 88% | 16,070 psi | 82% | 797 fps | 85.5% |
| Rottweil P 801² | <<locked>> | 60% | 12,517 psi | 64% | 725 fps | 98.7% |
| SNPE Vectan A1*² | <<locked>> | 60% | 11,081 psi | 57% | 643 fps | 86.9% |
| SNPE Vectan BA 9*² | <<locked>> | 68% | 13,314 psi | 68% | 689 fps | 85.1% |
| SNPE Vectan BA10² | <<locked>> | 60% | 15,621 psi | 80% | 692 fps | 100% |
| SNPE Vectan BA9 1/2*² | <<locked>> | 68% | 12,952 psi | 66% | 702 fps | 87.3% |
| Somchem MS200* | <<locked>> | 80% | 16,317 psi | 83% | 768 fps | 85.4% |
| Vihtavuori N320*² | <<locked>> | 60% | 9,848 psi | 50% | 643 fps | 92.2% |
| Vihtavuori N32C Tin Star*² | 1.5 gr | 60% | 5,323 psi | 27% | 482 fps | 90% |
| Vihtavuori N330*² | <<locked>> | 68% | 11,821 psi | 60% | 705 fps | 87.5% |
| Winchester 231*² | <<locked>> | 60% | 13,938 psi | 71% | 719 fps | 90.7% |
| Winchester AutoComp *² | <<locked>> | 76% | 13,068 psi | 67% | 715 fps | 86.3% |
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 35 powders for .380 ACP loaded with the .358 | 125gr | Rim Rock RNFP Cowboy. ReloadSwiss RS 12 delivers the highest muzzle velocity at 846 fps; across all powders the maximum-charge window runs from 535 fps to 846 fps. Baschieri & Pellagri 102 Pistol gives the best case fill at 100 %, and 16 of the 35 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 35–90 %, leaving at least 10 % headroom. Baschieri & Pellagri 102 Pistol, Hodgdon TrailBoss, 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. Maxam CSB 2, Vihtavuori N32C Tin Star rank at the top here: for .380 ACP with the .358 | 125gr | Rim Rock RNFP Cowboy they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate Solo 1250, ADI AP 70N, Alliant BE-86 burn incompletely and react more sensitively to barrel length and temperature. Accurate Solo 1000, Accurate Solo 1250, ADI AP 70N 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.