Load Specifications
Load data in caliber .357 Maximum with .358 | 125gr | Rim Rock RNFP Cowboy bullet and 63 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AP 100, Alliant Herco and Baschieri & Pellagri 102 Pistol.
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: 7.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 68% | 40,321 psi | 90% | 1706 fps | 100% |
| Accurate No. 7² | <<locked>> | 64% | 35,969 psi | 80% | 1824 fps | 97% |
| Accurate No. 9*² | <<locked>> | 72% | 36,303 psi | 81% | 1831 fps | 92.9% |
| Accurate Solo 1000² | <<locked>> | 72% | 40,466 psi | 90% | 1588 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 72% | 38,232 psi | 85% | 1617 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 36,608 psi | 81% | 1827 fps | 94.2% |
| ADI AP 100 | <<locked>> | 84% | 37,144 psi | 83% | 1778 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 39,769 psi | 88% | 1470 fps | 100% |
| ADI APS 450² | <<locked>> | 72% | 39,175 psi | 87% | 1496 fps | 100% |
| ADI AS 30² | <<locked>> | 72% | 39,624 psi | 88% | 1542 fps | 100% |
| ADI AS 50N² | <<locked>> | 68% | 40,263 psi | 90% | 1601 fps | 100% |
| Alliant 2400* | <<locked>> | 84% | 40,118 psi | 89% | 1919 fps | 91.9% |
| Alliant BE-86² | <<locked>> | 72% | 39,494 psi | 88% | 1614 fps | 100% |
| Alliant BLUE DOT | <<locked>> | 84% | 37,072 psi | 82% | 1841 fps | 96.6% |
| Alliant BULLSEYE² | <<locked>> | 64% | 39,001 psi | 87% | 1716 fps | 100% |
| Alliant Green Dot² | <<locked>> | 72% | 40,321 psi | 90% | 1604 fps | 100% |
| Alliant Herco | <<locked>> | 84% | 37,782 psi | 84% | 1693 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 36,318 psi | 81% | 1814 fps | 100% |
| Alliant RED DOT² | <<locked>> | 72% | 38,247 psi | 85% | 1545 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 72% | 39,088 psi | 87% | 1719 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 36,811 psi | 82% | 1539 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 88% | 40,292 psi | 90% | 1585 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 37,565 psi | 84% | 1558 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 38,116 psi | 85% | 1627 fps | 100% |
| Hodgdon Clays | <<locked>> | 80% | 38,798 psi | 86% | 1486 fps | 100% |
| Hodgdon LilGun* | <<locked>> | 92% | 36,666 psi | 82% | 1936 fps | 91.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 21,727 psi | 48% | 1247 fps | 100% |
| Hodgdon Universal² | <<locked>> | 68% | 40,466 psi | 90% | 1663 fps | 100% |
| Lovex D037.1² | <<locked>> | 64% | 35,969 psi | 80% | 1824 fps | 97% |
| Lovex D037.2*² | <<locked>> | 72% | 37,666 psi | 84% | 1854 fps | 93.5% |
| Lovex S020² | <<locked>> | 64% | 37,492 psi | 83% | 1647 fps | 100% |
| Maxam CSB 1² | <<locked>> | 76% | 38,943 psi | 87% | 1621 fps | 100% |
| Maxam CSB 2² | <<locked>> | 72% | 39,769 psi | 88% | 1624 fps | 100% |
| Maxam CSB 3² | <<locked>> | 72% | 39,363 psi | 88% | 1601 fps | 100% |
| Maxam CSB 4² | <<locked>> | 68% | 37,246 psi | 83% | 1552 fps | 100% |
| Maxam CSB 5² | <<locked>> | 68% | 40,016 psi | 89% | 1532 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 84% | 39,755 psi | 88% | 1919 fps | 92.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 20,508 psi | 46% | 1263 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 72% | 38,464 psi | 86% | 1690 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 72% | 38,595 psi | 86% | 1860 fps | 99% |
| Rottweil P 806² | <<locked>> | 72% | 35,810 psi | 80% | 1781 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 37,666 psi | 84% | 1854 fps | 93.5% |
| Shooters World Major Pistol² | <<locked>> | 64% | 35,969 psi | 80% | 1824 fps | 97% |
| SNPE Vectan A0² | <<locked>> | 76% | 39,987 psi | 89% | 1683 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 68% | 38,682 psi | 86% | 1604 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 68% | 38,058 psi | 85% | 1621 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 68% | 39,769 psi | 88% | 1503 fps | 100% |
| SNPE Vectan BA6 1/2*ᴾ | <<locked>> | 100% | 27,702 psi | 62% | 1677 fps | 89.1% |
| SNPE Vectan BA7 1/2 | <<locked>> | 80% | 40,205 psi | 89% | 1762 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 68% | 37,956 psi | 84% | 1624 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 37,536 psi | 83% | 1827 fps | 100% |
| Somchem MP200² | <<locked>> | 64% | 36,332 psi | 81% | 1673 fps | 100% |
| Somchem MS200² | <<locked>> | 72% | 40,132 psi | 89% | 1696 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 72% | 39,668 psi | 88% | 1772 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 84% | 39,146 psi | 87% | 1850 fps | 99.4% |
| Vihtavuori N105 | <<locked>> | 84% | 35,882 psi | 80% | 1834 fps | 100% |
| Vihtavuori N110*ᴾ | <<locked>> | 100% | 35,201 psi | 78% | 1854 fps | 90.3% |
| Vihtavuori N320² | <<locked>> | 64% | 37,028 psi | 82% | 1545 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 38,914 psi | 87% | 1483 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 37,173 psi | 83% | 1611 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 36,637 psi | 81% | 1650 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 38,029 psi | 85% | 1742 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 72% | 37,782 psi | 84% | 1627 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 7.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 31,082 psi | 69% | 1572 fps | 100% |
| Accurate No. 7² | <<locked>> | 60% | 30,835 psi | 69% | 1729 fps | 95.1% |
| Accurate No. 9*² | <<locked>> | 64% | 27,224 psi | 61% | 1644 fps | 87.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 30,269 psi | 67% | 1437 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 27,412 psi | 61% | 1453 fps | 100% |
| Accurate TCM*² | <<locked>> | 60% | 23,743 psi | 53% | 1558 fps | 86.7% |
| ADI AP 100² | 11.4 gr | 60% | 19,218 psi | 43% | 1398 fps | 95.8% |
| ADI APS 350² | <<locked>> | 60% | 30,937 psi | 69% | 1342 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,878 psi | 66% | 1358 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 29,892 psi | 66% | 1398 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 32,779 psi | 73% | 1493 fps | 100% |
| Alliant 2400*² | <<locked>> | 76% | 31,053 psi | 69% | 1749 fps | 87.3% |
| Alliant BE-86² | <<locked>> | 60% | 28,616 psi | 64% | 1457 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 64% | 20,581 psi | 46% | 1470 fps | 87% |
| Alliant BULLSEYE² | <<locked>> | 60% | 34,969 psi | 78% | 1657 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 30,269 psi | 67% | 1457 fps | 100% |
| Alliant Herco² | 10.3 gr | 60% | 20,668 psi | 46% | 1381 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 28,456 psi | 63% | 1663 fps | 99.1% |
| Alliant RED DOT² | <<locked>> | 60% | 29,066 psi | 65% | 1404 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 28,297 psi | 63% | 1545 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 29,704 psi | 66% | 1434 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | 9.7 gr | 60% | 20,131 psi | 45% | 1270 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 33,098 psi | 74% | 1499 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 30,574 psi | 68% | 1512 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 25,338 psi | 56% | 1276 fps | 100% |
| Hodgdon LilGun* | <<locked>> | 84% | 27,224 psi | 61% | 1739 fps | 85.1% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,993 psi | 22% | 938 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 32,677 psi | 73% | 1552 fps | 100% |
| Lovex D037.1² | <<locked>> | 60% | 30,835 psi | 69% | 1729 fps | 95.1% |
| Lovex D037.2*² | <<locked>> | 60% | 23,917 psi | 53% | 1565 fps | 85.4% |
| Lovex S020² | <<locked>> | 60% | 32,924 psi | 73% | 1578 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 25,715 psi | 57% | 1414 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 28,892 psi | 64% | 1463 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 29,022 psi | 65% | 1447 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 30,560 psi | 68% | 1450 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 32,866 psi | 73% | 1434 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 72% | 26,339 psi | 59% | 1654 fps | 85.4% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 9,689 psi | 22% | 955 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 27,108 psi | 60% | 1516 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 26,165 psi | 58% | 1614 fps | 94.7% |
| Rottweil P 806² | <<locked>> | 60% | 23,743 psi | 53% | 1558 fps | 99.9% |
| Shooters World Heavy Pistol*² | <<locked>> | 60% | 23,917 psi | 53% | 1565 fps | 85.4% |
| Shooters World Major Pistol² | <<locked>> | 60% | 30,835 psi | 69% | 1729 fps | 95.1% |
| SNPE Vectan A0² | <<locked>> | 60% | 26,223 psi | 58% | 1467 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 31,154 psi | 69% | 1496 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 30,530 psi | 68% | 1509 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 33,011 psi | 73% | 1407 fps | 100% |
| SNPE Vectan BA6 1/2* | <<locked>> | 96% | 24,860 psi | 55% | 1608 fps | 86.8% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 22,974 psi | 51% | 1460 fps | 99.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 30,139 psi | 67% | 1506 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 32,605 psi | 73% | 1742 fps | 100% |
| Somchem MP200² | <<locked>> | 60% | 32,271 psi | 72% | 1611 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 28,732 psi | 64% | 1519 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 27,282 psi | 61% | 1568 fps | 100% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 18,855 psi | 42% | 1411 fps | 90.2% |
| Vihtavuori N105*² | <<locked>> | 60% | 16,027 psi | 36% | 1375 fps | 91.3% |
| Vihtavuori N110* | <<locked>> | 92% | 27,369 psi | 61% | 1693 fps | 85.5% |
| Vihtavuori N320² | <<locked>> | 60% | 32,880 psi | 73% | 1486 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 17,027 psi | 38% | 1122 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 33,170 psi | 74% | 1555 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 28,819 psi | 64% | 1529 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 23,641 psi | 53% | 1490 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 27,238 psi | 61% | 1463 fps | 100% |
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 10 powders for .357 Maximum loaded with the .358 | 125gr | Rim Rock RNFP Cowboy. Ramshot Enforcer delivers the highest muzzle velocity at 1,919 fps; across all powders the maximum-charge window runs from 1,247 fps to 1,919 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 10 of the 10 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 46–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, 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. ADI AP 100, Alliant Herco, Baschieri & Pellagri 102 Pistol rank at the top here: for .357 Maximum 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, Ramshot Enforcer burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, ReloadSwiss RS 14 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.