Load Specifications
Load data in caliber .380 ACP with .358 | 125gr | Rim Rock TC 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 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>> | 76% | 17,158 psi | 88% | 732 fps | 97.6% |
| Accurate Solo 1250* | <<locked>> | 88% | 16,795 psi | 86% | 758 fps | 90.6% |
| ADI AP 70N*² | <<locked>> | 76% | 16,694 psi | 85% | 774 fps | 92% |
| ADI APS 350² | <<locked>> | 68% | 16,679 psi | 85% | 666 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 16,491 psi | 84% | 686 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 16,940 psi | 87% | 732 fps | 99.9% |
| ADI AS 50N² | <<locked>> | 76% | 16,897 psi | 86% | 745 fps | 97% |
| Alliant BE-86* | <<locked>> | 88% | 15,664 psi | 80% | 751 fps | 92.9% |
| Alliant Green Dot | <<locked>> | 80% | 16,694 psi | 85% | 745 fps | 97% |
| Alliant RED DOT | <<locked>> | 80% | 16,549 psi | 85% | 741 fps | 99.7% |
| Baschieri & Pellagri 100* | <<locked>> | 80% | 15,214 psi | 78% | 709 fps | 94% |
| Baschieri & Pellagri 102 Pistol*ᴾ | <<locked>> | 100% | 13,039 psi | 67% | 705 fps | 94.5% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 17,492 psi | 89% | 784 fps | 97% |
| Hodgdon CFE Pistol*² | <<locked>> | 68% | 17,419 psi | 89% | 781 fps | 89.8% |
| Hodgdon Clays | <<locked>> | 80% | 17,056 psi | 87% | 696 fps | 100% |
| Hodgdon Universal* | <<locked>> | 84% | 16,694 psi | 85% | 774 fps | 92% |
| Lovex S011*² | <<locked>> | 68% | 17,376 psi | 89% | 738 fps | 93% |
| Maxam CSB 1* | <<locked>> | 92% | 17,172 psi | 88% | 761 fps | 91.2% |
| Maxam CSB 2ᴾ | <<locked>> | 100% | 16,578 psi | 85% | 814 fps | 97.1% |
| Maxam CSB 3 | <<locked>> | 84% | 16,839 psi | 86% | 755 fps | 95.6% |
| Maxam CSB 4 | <<locked>> | 80% | 16,259 psi | 83% | 738 fps | 97.6% |
| Maxam CSB 5² | <<locked>> | 76% | 16,578 psi | 85% | 735 fps | 100% |
| Ramshot Zip*² | <<locked>> | 64% | 17,637 psi | 90% | 764 fps | 93.1% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 15,838 psi | 81% | 801 fps | 98.6% |
| Rottweil P 801² | <<locked>> | 76% | 17,042 psi | 87% | 794 fps | 99.9% |
| SNPE Vectan A1* | <<locked>> | 80% | 17,564 psi | 90% | 751 fps | 93.2% |
| SNPE Vectan BA 9* | <<locked>> | 80% | 16,853 psi | 86% | 735 fps | 87.7% |
| SNPE Vectan BA10² | <<locked>> | 64% | 16,476 psi | 84% | 686 fps | 100% |
| SNPE Vectan BA9 1/2* | <<locked>> | 84% | 16,273 psi | 83% | 748 fps | 89.9% |
| Vihtavuori N310² | <<locked>> | 64% | 16,824 psi | 86% | 728 fps | 100% |
| Vihtavuori N320 | <<locked>> | 80% | 15,026 psi | 77% | 741 fps | 97.2% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 9,921 psi | 51% | 630 fps | 98.7% |
| Vihtavuori N330* | <<locked>> | 84% | 15,069 psi | 77% | 755 fps | 90.6% |
| Winchester 231*² | <<locked>> | 72% | 17,637 psi | 90% | 764 fps | 93.1% |
| Winchester AutoComp * | <<locked>> | 92% | 16,491 psi | 84% | 761 fps | 88.9% |
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% | 11,618 psi | 59% | 623 fps | 92.5% |
| Accurate Solo 1250* | <<locked>> | 80% | 12,865 psi | 66% | 679 fps | 85.8% |
| ADI AP 70N*² | <<locked>> | 64% | 11,937 psi | 61% | 673 fps | 86% |
| ADI APS 350² | <<locked>> | 60% | 13,227 psi | 68% | 610 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 13,358 psi | 68% | 633 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 11,327 psi | 58% | 620 fps | 97.1% |
| ADI AS 50N*² | <<locked>> | 60% | 10,617 psi | 54% | 614 fps | 90.1% |
| Alliant BE-86*² | <<locked>> | 72% | 10,428 psi | 53% | 636 fps | 85.8% |
| Alliant Green Dot*² | <<locked>> | 60% | 10,530 psi | 54% | 610 fps | 90.1% |
| Alliant RED DOT*² | <<locked>> | 60% | 9,877 psi | 50% | 600 fps | 94.8% |
| Baschieri & Pellagri 100*² | <<locked>> | 60% | 9,471 psi | 48% | 581 fps | 85.9% |
| Baschieri & Pellagri 102 Pistol*² | <<locked>> | 76% | 8,064 psi | 41% | 571 fps | 85.4% |
| Baschieri & Pellagri 103 Pistol*² | <<locked>> | 60% | 8,557 psi | 44% | 587 fps | 85.2% |
| Hodgdon CFE Pistol*² | <<locked>> | 60% | 13,851 psi | 71% | 712 fps | 85.7% |
| Hodgdon Clays² | <<locked>> | 60% | 10,051 psi | 51% | 564 fps | 99.1% |
| Hodgdon Universal*² | <<locked>> | 72% | 13,039 psi | 67% | 699 fps | 87.6% |
| Lovex S011*² | <<locked>> | 60% | 13,169 psi | 67% | 659 fps | 88.4% |
| Maxam CSB 1* | <<locked>> | 80% | 12,285 psi | 63% | 666 fps | 85.2% |
| Maxam CSB 2*² | <<locked>> | 72% | 9,166 psi | 47% | 640 fps | 86.8% |
| Maxam CSB 3*² | <<locked>> | 64% | 9,660 psi | 49% | 600 fps | 86.3% |
| Maxam CSB 4*² | <<locked>> | 60% | 9,906 psi | 51% | 604 fps | 90.6% |
| Maxam CSB 5² | <<locked>> | 60% | 10,762 psi | 55% | 623 fps | 98.7% |
| Ramshot Zip*² | <<locked>> | 60% | 16,244 psi | 83% | 741 fps | 91.8% |
| ReloadSwiss RS 12*² | <<locked>> | 60% | 8,340 psi | 43% | 620 fps | 89% |
| Rottweil P 801² | <<locked>> | 60% | 10,747 psi | 55% | 669 fps | 96.4% |
| SNPE Vectan A1*² | <<locked>> | 64% | 11,792 psi | 60% | 636 fps | 86.4% |
| SNPE Vectan BA 9*² | <<locked>> | 76% | 15,606 psi | 80% | 712 fps | 86.4% |
| SNPE Vectan BA10² | <<locked>> | 60% | 14,852 psi | 76% | 659 fps | 100% |
| SNPE Vectan BA9 1/2*² | <<locked>> | 72% | 12,749 psi | 65% | 676 fps | 85.3% |
| Vihtavuori N310² | <<locked>> | 60% | 15,026 psi | 77% | 702 fps | 100% |
| Vihtavuori N320*² | <<locked>> | 60% | 9,166 psi | 47% | 607 fps | 89.4% |
| Vihtavuori N32C Tin Star*² | 1.3 gr | 60% | 4,815 psi | 25% | 443 fps | 85.7% |
| Vihtavuori N330*² | <<locked>> | 72% | 11,705 psi | 60% | 679 fps | 85.5% |
| Winchester 231*² | <<locked>> | 60% | 12,589 psi | 64% | 666 fps | 87.4% |
| Winchester AutoComp * | <<locked>> | 84% | 14,214 psi | 73% | 719 fps | 86.2% |
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 TC Cowboy. Maxam CSB 2 delivers the highest muzzle velocity at 814 fps; across all powders the maximum-charge window runs from 630 fps to 814 fps. Baschieri & Pellagri 102 Pistol gives the best case fill at 100 %, and 22 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 51–90 %, leaving at least 10 % headroom. Baschieri & Pellagri 102 Pistol, Maxam CSB 2, 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. Vihtavuori N32C Tin Star rank at the top here: for .380 ACP with the .358 | 125gr | Rim Rock TC 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.