Load Specifications
Load data in caliber .380 ACP with .358 | 105gr | Rim Rock TC Cowboy bullet and 34 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 12 and Alliant RED DOT.
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 1000 | <<locked>> | 80% | 16,650 psi | 85% | 810 fps | 95.6% |
| Accurate Solo 1250* | <<locked>> | 92% | 16,737 psi | 85% | 843 fps | 87.9% |
| ADI AP 70N*² | <<locked>> | 76% | 15,345 psi | 78% | 837 fps | 87.9% |
| ADI APS 350² | <<locked>> | 72% | 17,100 psi | 87% | 761 fps | 100% |
| ADI APS 450² | <<locked>> | 72% | 16,505 psi | 84% | 774 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 16,447 psi | 84% | 814 fps | 99.2% |
| ADI AS 50N | <<locked>> | 80% | 17,448 psi | 89% | 846 fps | 95.6% |
| Alliant BE-86* | <<locked>> | 92% | 16,317 psi | 83% | 853 fps | 91.1% |
| Alliant Green Dot | <<locked>> | 84% | 17,187 psi | 88% | 846 fps | 95.5% |
| Alliant RED DOT | <<locked>> | 88% | 17,434 psi | 89% | 853 fps | 99.3% |
| Baschieri & Pellagri 100* | <<locked>> | 84% | 15,606 psi | 80% | 801 fps | 92.1% |
| Baschieri & Pellagri 102 Pistol*ᴾ | <<locked>> | 100% | 12,792 psi | 65% | 781 fps | 91.6% |
| Baschieri & Pellagri 103 Pistol* | <<locked>> | 84% | 16,389 psi | 84% | 856 fps | 94.2% |
| Hodgdon Clays² | <<locked>> | 72% | 17,056 psi | 87% | 771 fps | 100% |
| Hodgdon HP38*² | <<locked>> | 64% | 17,143 psi | 88% | 843 fps | 91.2% |
| Hodgdon Universal* | <<locked>> | 84% | 15,345 psi | 78% | 837 fps | 87.9% |
| Lovex S011*² | <<locked>> | 68% | 15,214 psi | 78% | 781 fps | 88.3% |
| Maxam CSB 1* | <<locked>> | 96% | 16,955 psi | 87% | 846 fps | 88.4% |
| Maxam CSB 2*ᴾ | <<locked>> | 100% | 15,853 psi | 81% | 899 fps | 94.5% |
| Maxam CSB 3* | <<locked>> | 88% | 17,071 psi | 87% | 850 fps | 93.7% |
| Maxam CSB 4 | <<locked>> | 84% | 16,839 psi | 86% | 840 fps | 96.4% |
| Maxam CSB 5 | <<locked>> | 80% | 17,579 psi | 90% | 846 fps | 100% |
| Ramshot Zip*² | <<locked>> | 64% | 16,360 psi | 84% | 830 fps | 89.4% |
| ReloadSwiss RS 12 | <<locked>> | 88% | 16,462 psi | 84% | 915 fps | 97.5% |
| Rottweil P 801 | <<locked>> | 80% | 16,578 psi | 85% | 886 fps | 99.1% |
| SNPE Vectan A1* | <<locked>> | 84% | 17,521 psi | 89% | 840 fps | 90.8% |
| SNPE Vectan BA10² | <<locked>> | 68% | 16,491 psi | 84% | 774 fps | 100% |
| SNPE Vectan BA9 1/2* | <<locked>> | 88% | 17,405 psi | 89% | 860 fps | 88.4% |
| Vihtavuori N310² | <<locked>> | 64% | 16,288 psi | 83% | 817 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 15,287 psi | 78% | 837 fps | 95.5% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 9,326 psi | 48% | 689 fps | 96.4% |
| Vihtavuori N330* | <<locked>> | 92% | 17,289 psi | 88% | 889 fps | 90.2% |
| Winchester 231*² | <<locked>> | 72% | 17,579 psi | 90% | 853 fps | 90.6% |
| Winchester AutoComp * | <<locked>> | 96% | 16,853 psi | 86% | 856 fps | 86.5% |
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% | 10,660 psi | 54% | 669 fps | 88.5% |
| Accurate Solo 1250* | <<locked>> | 88% | 15,519 psi | 79% | 820 fps | 86.5% |
| ADI AP 70N*² | <<locked>> | 72% | 14,243 psi | 73% | 810 fps | 86.5% |
| ADI APS 350² | <<locked>> | 60% | 13,909 psi | 71% | 705 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 12,386 psi | 63% | 692 fps | 99.7% |
| ADI AS 30*² | <<locked>> | 60% | 10,370 psi | 53% | 673 fps | 94.1% |
| ADI AS 50N*² | <<locked>> | 60% | 10,573 psi | 54% | 686 fps | 87.4% |
| Alliant BE-86* | <<locked>> | 80% | 12,183 psi | 62% | 758 fps | 85.8% |
| Alliant Green Dot*² | <<locked>> | 60% | 9,573 psi | 49% | 656 fps | 85.6% |
| Alliant RED DOT*² | 1.5 gr | 60% | 9,065 psi | 46% | 650 fps | 91.1% |
| Baschieri & Pellagri 100*² | <<locked>> | 68% | 11,110 psi | 57% | 699 fps | 86.2% |
| Baschieri & Pellagri 102 Pistol* | <<locked>> | 88% | 9,587 psi | 49% | 689 fps | 85.9% |
| Baschieri & Pellagri 103 Pistol*² | <<locked>> | 68% | 10,428 psi | 53% | 715 fps | 86.2% |
| Hodgdon Clays² | <<locked>> | 60% | 13,895 psi | 71% | 712 fps | 100% |
| Hodgdon HP38*² | <<locked>> | 60% | 14,707 psi | 75% | 794 fps | 88.6% |
| Hodgdon Universal* | <<locked>> | 80% | 14,243 psi | 73% | 810 fps | 86.5% |
| Lovex S011*² | <<locked>> | 60% | 12,850 psi | 66% | 728 fps | 85.2% |
| Maxam CSB 1* | <<locked>> | 92% | 15,795 psi | 81% | 823 fps | 87.1% |
| Maxam CSB 2* | <<locked>> | 80% | 10,037 psi | 51% | 745 fps | 85.5% |
| Maxam CSB 3*² | <<locked>> | 72% | 11,327 psi | 58% | 719 fps | 86.6% |
| Maxam CSB 4*² | <<locked>> | 60% | 9,007 psi | 46% | 646 fps | 86% |
| Maxam CSB 5² | <<locked>> | 60% | 9,761 psi | 50% | 676 fps | 96% |
| Ramshot Zip*² | <<locked>> | 60% | 15,185 psi | 78% | 807 fps | 88.1% |
| ReloadSwiss RS 12*² | 2.2 gr | 64% | 8,615 psi | 44% | 705 fps | 86.5% |
| Rottweil P 801*² | <<locked>> | 60% | 9,224 psi | 47% | 705 fps | 91.8% |
| SNPE Vectan A1*² | <<locked>> | 72% | 13,140 psi | 67% | 745 fps | 85.6% |
| SNPE Vectan BA10² | <<locked>> | 60% | 13,648 psi | 70% | 722 fps | 99.9% |
| SNPE Vectan BA9 1/2* | <<locked>> | 84% | 15,069 psi | 77% | 810 fps | 85.7% |
| Vihtavuori N310² | <<locked>> | 60% | 13,242 psi | 68% | 761 fps | 100% |
| Vihtavuori N320*² | <<locked>> | 64% | 9,021 psi | 46% | 669 fps | 85.9% |
| Vihtavuori N32C Tin Star*² | <<locked>> | 72% | 5,729 psi | 29% | 548 fps | 86.6% |
| Vihtavuori N330* | <<locked>> | 84% | 14,895 psi | 76% | 837 fps | 87.3% |
| Winchester 231*² | <<locked>> | 64% | 12,995 psi | 66% | 755 fps | 85.1% |
| Winchester AutoComp * | <<locked>> | 92% | 15,838 psi | 81% | 837 fps | 85.4% |
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 34 powders for .380 ACP loaded with the .358 | 105gr | Rim Rock TC Cowboy. ReloadSwiss RS 12 delivers the highest muzzle velocity at 915 fps; across all powders the maximum-charge window runs from 689 fps to 915 fps. Baschieri & Pellagri 102 Pistol gives the best case fill at 100 %, and 24 of the 34 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (135 MPa), the top charges use 48–90 %, 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. ReloadSwiss RS 12, Alliant RED DOT rank at the top here: for .380 ACP with the .358 | 105gr | 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.