Load Specifications
Load data in caliber .357 Maximum with .358 | 105gr | Rim Rock TC Cowboy bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N105, Vihtavuori 3N38 and ADI AP 100.
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% | 36,245 psi | 81% | 1811 fps | 100% |
| Accurate No. 7² | <<locked>> | 68% | 36,492 psi | 81% | 1988 fps | 95% |
| Accurate No. 9*² | <<locked>> | 76% | 36,666 psi | 82% | 1978 fps | 89.9% |
| Accurate Solo 1000² | <<locked>> | 72% | 37,971 psi | 84% | 1709 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 76% | 38,638 psi | 86% | 1785 fps | 100% |
| Accurate TCM*² | <<locked>> | 76% | 36,666 psi | 82% | 1972 fps | 91.2% |
| ADI AP 100 | <<locked>> | 92% | 40,335 psi | 90% | 1991 fps | 100% |
| ADI AP 70N² | <<locked>> | 64% | 40,176 psi | 89% | 1827 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 38,101 psi | 85% | 1585 fps | 100% |
| ADI APS 450² | <<locked>> | 72% | 37,405 psi | 83% | 1611 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 40,306 psi | 90% | 1703 fps | 100% |
| ADI AS 50N² | <<locked>> | 68% | 37,028 psi | 82% | 1713 fps | 100% |
| Alliant 2400* | <<locked>> | 88% | 38,798 psi | 86% | 2047 fps | 88.1% |
| Alliant BE-86² | <<locked>> | 76% | 40,205 psi | 89% | 1781 fps | 100% |
| Alliant BLUE DOT | <<locked>> | 92% | 40,248 psi | 90% | 2051 fps | 95.3% |
| Alliant BULLSEYE² | <<locked>> | 68% | 39,943 psi | 89% | 1900 fps | 100% |
| Alliant Green Dot² | <<locked>> | 72% | 37,666 psi | 84% | 1722 fps | 100% |
| Alliant Herco | <<locked>> | 88% | 37,942 psi | 84% | 1857 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 72% | 36,492 psi | 81% | 1982 fps | 99.5% |
| Alliant RED DOT² | <<locked>> | 76% | 39,465 psi | 88% | 1716 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 40,640 psi | 90% | 1916 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 76% | 39,523 psi | 88% | 1896 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 72% | 38,145 psi | 85% | 1709 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 92% | 40,001 psi | 89% | 1736 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 68% | 38,493 psi | 86% | 1722 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 39,856 psi | 89% | 1640 fps | 100% |
| Hodgdon LilGun*ᴾ | <<locked>> | 100% | 40,451 psi | 90% | 2152 fps | 89.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,856 psi | 44% | 1335 fps | 100% |
| Hodgdon Universal² | <<locked>> | 68% | 36,724 psi | 82% | 1775 fps | 100% |
| Lovex D037.1² | <<locked>> | 68% | 36,492 psi | 81% | 1988 fps | 95% |
| Lovex D037.2*² | <<locked>> | 76% | 37,594 psi | 84% | 1995 fps | 90.4% |
| Lovex S011² | <<locked>> | 64% | 40,422 psi | 90% | 1778 fps | 100% |
| Lovex S020² | <<locked>> | 68% | 38,232 psi | 85% | 1818 fps | 100% |
| Maxam CSB 1 | <<locked>> | 80% | 39,827 psi | 89% | 1791 fps | 100% |
| Maxam CSB 2² | <<locked>> | 76% | 39,856 psi | 89% | 1788 fps | 100% |
| Maxam CSB 3² | <<locked>> | 76% | 40,030 psi | 89% | 1768 fps | 100% |
| Maxam CSB 4² | <<locked>> | 72% | 38,116 psi | 85% | 1719 fps | 100% |
| Maxam CSB 5² | <<locked>> | 68% | 37,666 psi | 84% | 1650 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 88% | 38,899 psi | 87% | 2051 fps | 89.4% |
| ReloadSwiss RS 12² | <<locked>> | 64% | 37,739 psi | 84% | 1739 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,623 psi | 41% | 1348 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 76% | 38,609 psi | 86% | 1864 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 76% | 38,682 psi | 86% | 2018 fps | 97.3% |
| Rottweil P 806 | <<locked>> | 80% | 40,451 psi | 90% | 2021 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 76% | 37,594 psi | 84% | 1995 fps | 90.4% |
| Shooters World Major Pistol² | <<locked>> | 68% | 36,492 psi | 81% | 1988 fps | 95% |
| SNPE Vectan A0 | <<locked>> | 80% | 40,030 psi | 89% | 1847 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 72% | 39,595 psi | 88% | 1775 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 72% | 38,885 psi | 86% | 1791 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 68% | 37,956 psi | 84% | 1617 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 84% | 40,103 psi | 89% | 1926 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 72% | 38,261 psi | 85% | 1788 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 68% | 37,724 psi | 84% | 1998 fps | 100% |
| Somchem MP200² | <<locked>> | 68% | 37,246 psi | 83% | 1850 fps | 100% |
| Somchem MS200² | <<locked>> | 72% | 36,927 psi | 82% | 1818 fps | 100% |
| Somchem S221² | <<locked>> | 64% | 38,566 psi | 86% | 1982 fps | 99% |
| Vihtavuori 3N37² | <<locked>> | 76% | 39,407 psi | 88% | 1936 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 88% | 38,189 psi | 85% | 1991 fps | 97.8% |
| Vihtavuori N105 | <<locked>> | 92% | 38,928 psi | 87% | 2051 fps | 99.8% |
| Vihtavuori N320² | <<locked>> | 68% | 37,739 psi | 84% | 1713 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 36,376 psi | 81% | 1594 fps | 100% |
| Vihtavuori N330² | <<locked>> | 68% | 37,869 psi | 84% | 1785 fps | 100% |
| Vihtavuori N340² | <<locked>> | 72% | 37,202 psi | 83% | 1821 fps | 100% |
| Vihtavuori N350 | <<locked>> | 80% | 38,435 psi | 85% | 1913 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 76% | 38,218 psi | 85% | 1791 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% | 28,253 psi | 63% | 1673 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 26,716 psi | 59% | 1772 fps | 89.8% |
| Accurate No. 9*² | <<locked>> | 72% | 31,589 psi | 70% | 1877 fps | 87.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,123 psi | 63% | 1545 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 24,932 psi | 55% | 1552 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,441 psi | 61% | 1775 fps | 85.9% |
| ADI AP 100*² | 11.2 gr | 60% | 16,882 psi | 38% | 1440 fps | 90.9% |
| ADI AP 70N² | <<locked>> | 60% | 35,621 psi | 79% | 1755 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 29,385 psi | 65% | 1444 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,268 psi | 63% | 1463 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,862 psi | 62% | 1503 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 30,385 psi | 68% | 1601 fps | 100% |
| Alliant 2400* | <<locked>> | 84% | 34,330 psi | 76% | 1955 fps | 85.7% |
| Alliant BE-86² | <<locked>> | 60% | 25,759 psi | 57% | 1549 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,032 psi | 51% | 1663 fps | 85.7% |
| Alliant BULLSEYE² | <<locked>> | 60% | 32,010 psi | 71% | 1768 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 27,992 psi | 62% | 1562 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,666 psi | 42% | 1460 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,048 psi | 56% | 1726 fps | 96% |
| Alliant RED DOT² | <<locked>> | 60% | 27,006 psi | 60% | 1509 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 36,114 psi | 80% | 1847 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,614 psi | 57% | 1644 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,325 psi | 61% | 1535 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,927 psi | 40% | 1345 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 30,182 psi | 67% | 1601 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,830 psi | 53% | 1375 fps | 100% |
| Hodgdon LilGun* | <<locked>> | 96% | 34,548 psi | 77% | 2037 fps | 86.4% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,224 psi | 21% | 1010 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 29,921 psi | 67% | 1660 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 26,716 psi | 59% | 1772 fps | 89.8% |
| Lovex D037.2*² | <<locked>> | 72% | 32,416 psi | 72% | 1893 fps | 87.7% |
| Lovex S011² | <<locked>> | 60% | 35,607 psi | 79% | 1709 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 29,863 psi | 66% | 1683 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 23,438 psi | 52% | 1512 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,107 psi | 58% | 1565 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,687 psi | 59% | 1552 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,268 psi | 63% | 1555 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 30,719 psi | 68% | 1542 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 84% | 33,953 psi | 76% | 1955 fps | 86.9% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 33,808 psi | 75% | 1680 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 8,688 psi | 19% | 1010 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,236 psi | 54% | 1608 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,872 psi | 51% | 1660 fps | 89.4% |
| Rottweil P 806² | <<locked>> | 60% | 20,146 psi | 45% | 1604 fps | 97.7% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 32,416 psi | 72% | 1893 fps | 87.7% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 26,716 psi | 59% | 1772 fps | 89.8% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,453 psi | 52% | 1552 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,819 psi | 64% | 1604 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,050 psi | 62% | 1614 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 31,343 psi | 70% | 1516 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,392 psi | 45% | 1522 fps | 98.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,601 psi | 61% | 1611 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,703 psi | 64% | 1821 fps | 98.8% |
| Somchem MP200² | <<locked>> | 60% | 29,399 psi | 65% | 1713 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,208 psi | 58% | 1621 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 33,533 psi | 75% | 1890 fps | 97.8% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,004 psi | 53% | 1644 fps | 99.7% |
| Vihtavuori 3N38*² | 13.8 gr | 64% | 18,695 psi | 42% | 1526 fps | 86.6% |
| Vihtavuori N105*² | 13.6 gr | 64% | 15,592 psi | 35% | 1480 fps | 87.1% |
| Vihtavuori N320² | <<locked>> | 60% | 30,226 psi | 67% | 1594 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 15,461 psi | 34% | 1201 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 30,081 psi | 67% | 1660 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,107 psi | 58% | 1624 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,045 psi | 47% | 1562 fps | 99.2% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,860 psi | 55% | 1562 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 65 powders for .357 Maximum loaded with the .358 | 105gr | Rim Rock TC Cowboy. Hodgdon LilGun delivers the highest muzzle velocity at 2,152 fps; across all powders the maximum-charge window runs from 1,335 fps to 2,152 fps. Hodgdon LilGun gives the best case fill at 100 %, and 18 of the 65 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 41–90 %, leaving at least 10 % headroom. Hodgdon LilGun, Hodgdon TrailBoss, ReloadSwiss RS 14 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 N105, Vihtavuori 3N38, ADI AP 100 rank at the top here: for .357 Maximum 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 No. 9, Accurate TCM, Alliant 2400 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.