Load Specifications
Load data in caliber .357 SIG with .358 | 125gr | Rim Rock TC Cowboy bullet and 66 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori 3N37, Alliant UNIQUE and Somchem MP200.
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: 4.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2 | <<locked>> | 84% | 37,028 psi | 84% | 1296 fps | 99.9% |
| Accurate No. 5² | <<locked>> | 72% | 39,189 psi | 89% | 1404 fps | 96.1% |
| Accurate Solo 1000 | <<locked>> | 88% | 38,682 psi | 87% | 1234 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 92% | 36,477 psi | 82% | 1270 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 28,166 psi | 64% | 1240 fps | 89.4% |
| ADI AP 70N | <<locked>> | 80% | 39,059 psi | 88% | 1319 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 38,479 psi | 87% | 1119 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 36,637 psi | 83% | 1135 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 37,478 psi | 85% | 1194 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 37,173 psi | 84% | 1237 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 38,479 psi | 87% | 1283 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 39,378 psi | 89% | 1368 fps | 100% |
| Alliant Green Dot | <<locked>> | 88% | 36,637 psi | 83% | 1234 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 29,950 psi | 68% | 1253 fps | 99.9% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 39,494 psi | 89% | 1457 fps | 94% |
| Alliant RED DOT | <<locked>> | 92% | 39,218 psi | 89% | 1234 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 36,434 psi | 82% | 1335 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 38,972 psi | 88% | 1375 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 37,130 psi | 84% | 1224 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 29,907 psi | 68% | 1165 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 38,711 psi | 88% | 1266 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 37,826 psi | 86% | 1309 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 38,551 psi | 87% | 1155 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 35,331 psi | 80% | 1240 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 36,579 psi | 83% | 1358 fps | 97% |
| Hodgdon Longshot² | <<locked>> | 72% | 35,969 psi | 81% | 1348 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,937 psi | 29% | 837 fps | 100% |
| Hodgdon Universal | <<locked>> | 88% | 39,059 psi | 88% | 1319 fps | 100% |
| Lovex D036² | <<locked>> | 72% | 39,131 psi | 88% | 1407 fps | 96.1% |
| Lovex S011² | <<locked>> | 76% | 38,058 psi | 86% | 1257 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 36,811 psi | 83% | 1306 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 39,885 psi | 90% | 1306 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 39,204 psi | 89% | 1309 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 38,580 psi | 87% | 1266 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 37,811 psi | 85% | 1240 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 38,493 psi | 87% | 1194 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 36,361 psi | 82% | 1335 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 37,710 psi | 85% | 1365 fps | 98.5% |
| Ramshot Zip² | <<locked>> | 68% | 39,958 psi | 90% | 1299 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 39,262 psi | 89% | 1293 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,298 psi | 26% | 820 fps | 99.5% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 37,579 psi | 85% | 1358 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 37,536 psi | 85% | 1240 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 33,272 psi | 75% | 1414 fps | 96.6% |
| Shooters World Auto Pistol² | <<locked>> | 72% | 39,131 psi | 88% | 1407 fps | 96.1% |
| SNPE Vectan A0 | <<locked>> | 96% | 37,550 psi | 85% | 1309 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 39,610 psi | 90% | 1286 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 38,464 psi | 87% | 1293 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 37,898 psi | 86% | 1148 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 35,418 psi | 80% | 1325 fps | 97.5% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 36,550 psi | 83% | 1280 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 92% | 39,711 psi | 90% | 1476 fps | 95.8% |
| Somchem MP200 | <<locked>> | 88% | 38,885 psi | 88% | 1358 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 38,203 psi | 86% | 1329 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 36,796 psi | 83% | 1385 fps | 90% |
| Vihtavuori 3N37 | <<locked>> | 96% | 38,783 psi | 88% | 1391 fps | 99% |
| Vihtavuori N310² | <<locked>> | 68% | 36,796 psi | 83% | 1142 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 37,840 psi | 86% | 1247 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 23,424 psi | 53% | 1014 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 39,900 psi | 90% | 1329 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 38,305 psi | 87% | 1332 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 36,405 psi | 82% | 1358 fps | 98.7% |
| Winchester 231² | <<locked>> | 76% | 39,958 psi | 90% | 1299 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 39,378 psi | 89% | 1280 fps | 100% |
| Winchester 572² | <<locked>> | 64% | 35,911 psi | 81% | 1355 fps | 97.7% |
| Winchester AutoComp | <<locked>> | 96% | 39,537 psi | 89% | 1322 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 4.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2*² | <<locked>> | 60% | 18,028 psi | 41% | 997 fps | 93.5% |
| Accurate No. 5*² | <<locked>> | 60% | 26,020 psi | 59% | 1204 fps | 90.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 19,508 psi | 44% | 978 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 15,679 psi | 35% | 945 fps | 98.9% |
| ADI AP 100* | <<locked>> | 92% | 23,598 psi | 53% | 1158 fps | 86.3% |
| ADI AP 70N² | <<locked>> | 60% | 22,713 psi | 51% | 1096 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,626 psi | 51% | 932 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 21,277 psi | 48% | 942 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 20,015 psi | 45% | 961 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 20,465 psi | 46% | 1010 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 16,346 psi | 37% | 965 fps | 99.9% |
| Alliant BULLSEYE² | <<locked>> | 60% | 20,914 psi | 47% | 1086 fps | 98.2% |
| Alliant Green Dot² | <<locked>> | 60% | 18,579 psi | 42% | 974 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,443 psi | 26% | 850 fps | 88.9% |
| Alliant POWER PISTOL* | <<locked>> | 80% | 26,324 psi | 60% | 1247 fps | 87.3% |
| Alliant RED DOT² | <<locked>> | 60% | 18,362 psi | 42% | 951 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 23,395 psi | 53% | 1135 fps | 98.7% |
| Alliant UNIQUE*² | 4.4 gr | 60% | 15,418 psi | 35% | 968 fps | 93.9% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 17,898 psi | 40% | 958 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,820 psi | 24% | 820 fps | 99.5% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 18,942 psi | 43% | 1010 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 29,544 psi | 67% | 1207 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,637 psi | 40% | 883 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 31,995 psi | 72% | 1201 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 21,582 psi | 49% | 1112 fps | 89.6% |
| Hodgdon Longshot*² | <<locked>> | 60% | 23,728 psi | 54% | 1158 fps | 93.2% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 5,947 psi | 13% | 600 fps | 96.3% |
| Hodgdon Universal² | <<locked>> | 60% | 18,695 psi | 42% | 1020 fps | 99.9% |
| Lovex D036*² | <<locked>> | 60% | 26,020 psi | 59% | 1207 fps | 90.3% |
| Lovex S011² | <<locked>> | 60% | 24,482 psi | 55% | 1086 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 18,028 psi | 41% | 1020 fps | 97.9% |
| Maxam CSB 1² | <<locked>> | 60% | 15,055 psi | 34% | 925 fps | 98.6% |
| Maxam CSB 2² | <<locked>> | 60% | 15,243 psi | 34% | 961 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 17,622 psi | 40% | 971 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 18,985 psi | 43% | 981 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 21,176 psi | 48% | 981 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 22,031 psi | 50% | 1115 fps | 96.6% |
| Ramshot True Blue*² | <<locked>> | 60% | 24,990 psi | 56% | 1175 fps | 94% |
| Ramshot Zip² | <<locked>> | 60% | 30,821 psi | 70% | 1194 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 20,407 psi | 46% | 1050 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,744 psi | 13% | 600 fps | 91.3% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,692 psi | 31% | 945 fps | 94.5% |
| Rottweil P 801² | <<locked>> | 60% | 23,772 psi | 54% | 1073 fps | 100% |
| Rottweil P 806* | <<locked>> | 80% | 17,100 psi | 39% | 1119 fps | 85.9% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 26,020 psi | 59% | 1207 fps | 90.3% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,982 psi | 34% | 925 fps | 93.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 19,261 psi | 44% | 1004 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 18,434 psi | 42% | 997 fps | 98.9% |
| SNPE Vectan BA10² | <<locked>> | 60% | 24,221 psi | 55% | 988 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 17,796 psi | 40% | 1017 fps | 87.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 17,390 psi | 39% | 984 fps | 99.4% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 21,567 psi | 49% | 1175 fps | 86% |
| Somchem MP200² | 5.1 gr | 60% | 18,391 psi | 42% | 1030 fps | 95.1% |
| Somchem MS200² | <<locked>> | 60% | 16,810 psi | 38% | 981 fps | 96.1% |
| Somchem S221*² | <<locked>> | 72% | 28,108 psi | 64% | 1250 fps | 85.4% |
| Vihtavuori 3N37*² | 5.7 gr | 64% | 15,316 psi | 35% | 981 fps | 86.1% |
| Vihtavuori N310² | <<locked>> | 60% | 30,052 psi | 68% | 1070 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 19,174 psi | 43% | 1001 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,485 psi | 21% | 741 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 17,289 psi | 39% | 1010 fps | 99.9% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,563 psi | 35% | 958 fps | 94.5% |
| Vihtavuori N350*² | <<locked>> | 68% | 15,214 psi | 34% | 981 fps | 86.5% |
| Winchester 231² | <<locked>> | 60% | 24,990 psi | 56% | 1112 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 34,592 psi | 78% | 1230 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 30,835 psi | 70% | 1283 fps | 96.1% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,040 psi | 34% | 938 fps | 97.7% |
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 66 powders for .357 SIG loaded with the .358 | 125gr | Rim Rock TC Cowboy. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,476 fps; across all powders the maximum-charge window runs from 820 fps to 1,476 fps. ADI AP 100 gives the best case fill at 100 %, and 49 of the 66 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 26–90 %, leaving at least 10 % headroom. ADI AP 100, Alliant Herco, Baschieri & Pellagri 102 Pistol 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 3N37, Alliant UNIQUE, Somchem MP200 rank at the top here: for .357 SIG 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, ADI AP 100, Alliant POWER PISTOL, Somchem S221 burn incompletely and react more sensitively to barrel length and temperature. Accurate No. 2, Accurate Solo 1000, Accurate Solo 1250 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.