Load Specifications
Load data in caliber .357 SIG with .358 | 120gr | Rim Rock TC Cowboy bullet and 67 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant BULLSEYE, Somchem MP200 and Vihtavuori 3N37.
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>> | 88% | 38,493 psi | 87% | 1322 fps | 99.7% |
| Accurate No. 5*² | <<locked>> | 72% | 36,201 psi | 82% | 1378 fps | 94% |
| Accurate Solo 1000 | <<locked>> | 92% | 39,581 psi | 89% | 1260 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 37,434 psi | 85% | 1299 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 26,484 psi | 60% | 1224 fps | 86.8% |
| ADI AP 70N | <<locked>> | 80% | 37,405 psi | 85% | 1319 fps | 100% |
| ADI APS 350 | <<locked>> | 88% | 39,349 psi | 89% | 1142 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 38,885 psi | 88% | 1175 fps | 100% |
| ADI AS 30 | <<locked>> | 92% | 38,101 psi | 86% | 1217 fps | 100% |
| ADI AS 50N | <<locked>> | 88% | 37,942 psi | 86% | 1263 fps | 100% |
| Alliant BE-86 | <<locked>> | 96% | 39,769 psi | 90% | 1316 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 36,550 psi | 83% | 1352 fps | 100% |
| Alliant Green Dot | <<locked>> | 92% | 37,318 psi | 84% | 1260 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 27,920 psi | 63% | 1237 fps | 99.4% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 36,434 psi | 82% | 1424 fps | 91.4% |
| Alliant RED DOT | <<locked>> | 96% | 39,914 psi | 90% | 1260 fps | 100% |
| Alliant Sport Pistol | <<locked>> | 80% | 38,508 psi | 87% | 1378 fps | 100% |
| Alliant UNIQUEᴾ | <<locked>> | 100% | 39,958 psi | 90% | 1404 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 92% | 38,043 psi | 86% | 1250 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 27,557 psi | 62% | 1152 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 35,897 psi | 81% | 1257 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 35,389 psi | 80% | 1296 fps | 100% |
| Hodgdon Claysᴾ | <<locked>> | 100% | 39,653 psi | 90% | 1181 fps | 100% |
| Hodgdon HP38² | <<locked>> | 68% | 38,711 psi | 88% | 1296 fps | 100% |
| Hodgdon HS-6 | <<locked>> | 80% | 39,175 psi | 89% | 1401 fps | 96.7% |
| Hodgdon Longshot² | <<locked>> | 76% | 38,363 psi | 87% | 1391 fps | 97.9% |
| Hodgdon TiteGroup² | <<locked>> | 64% | 39,160 psi | 89% | 1247 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,603 psi | 26% | 817 fps | 100% |
| Hodgdon Universal | <<locked>> | 92% | 39,900 psi | 90% | 1348 fps | 100% |
| Lovex D036*² | <<locked>> | 72% | 36,143 psi | 82% | 1375 fps | 93.9% |
| Lovex S011² | <<locked>> | 76% | 36,405 psi | 82% | 1253 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 37,884 psi | 86% | 1332 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 37,231 psi | 84% | 1293 fps | 100% |
| Maxam CSB 2ᴾ | <<locked>> | 100% | 39,900 psi | 90% | 1339 fps | 100% |
| Maxam CSB 3 | <<locked>> | 96% | 39,407 psi | 89% | 1293 fps | 100% |
| Maxam CSB 4 | <<locked>> | 92% | 38,595 psi | 87% | 1263 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 36,405 psi | 82% | 1191 fps | 100% |
| Ramshot Silhouette | <<locked>> | 80% | 37,521 psi | 85% | 1365 fps | 99.8% |
| Ramshot True Blue² | <<locked>> | 76% | 39,102 psi | 88% | 1394 fps | 98.1% |
| Ramshot Zip² | <<locked>> | 68% | 37,202 psi | 84% | 1286 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 37,217 psi | 84% | 1296 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,573 psi | 24% | 810 fps | 98.6% |
| ReloadSwiss RS 20ᴾ | <<locked>> | 100% | 37,217 psi | 84% | 1375 fps | 100% |
| Rottweil P 801 | <<locked>> | 80% | 39,465 psi | 89% | 1280 fps | 100% |
| Rottweil P 806*ᴾ | <<locked>> | 100% | 28,848 psi | 65% | 1368 fps | 93.7% |
| Shooters World Auto Pistol*² | <<locked>> | 72% | 36,143 psi | 82% | 1375 fps | 93.9% |
| SNPE Vectan A0ᴾ | <<locked>> | 100% | 37,521 psi | 85% | 1322 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 37,304 psi | 84% | 1280 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 92% | 39,668 psi | 90% | 1322 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 36,216 psi | 82% | 1145 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 32,706 psi | 74% | 1299 fps | 95.7% |
| SNPE Vectan BA9 1/2 | <<locked>> | 92% | 37,478 psi | 85% | 1309 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 92% | 36,230 psi | 82% | 1444 fps | 93.5% |
| Somchem MP200 | <<locked>> | 88% | 36,492 psi | 82% | 1348 fps | 99.9% |
| Somchem MS200 | <<locked>> | 96% | 39,291 psi | 89% | 1358 fps | 100% |
| Somchem S221* | <<locked>> | 84% | 38,406 psi | 87% | 1414 fps | 89.2% |
| Vihtavuori 3N37 | <<locked>> | 96% | 35,621 psi | 81% | 1368 fps | 97.6% |
| Vihtavuori N310² | <<locked>> | 72% | 38,827 psi | 88% | 1178 fps | 100% |
| Vihtavuori N320 | <<locked>> | 88% | 38,522 psi | 87% | 1273 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 21,712 psi | 49% | 1007 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 36,680 psi | 83% | 1312 fps | 100% |
| Vihtavuori N340 | <<locked>> | 96% | 39,552 psi | 89% | 1362 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 34,272 psi | 77% | 1345 fps | 97.5% |
| Winchester 231² | <<locked>> | 76% | 37,202 psi | 84% | 1286 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 36,608 psi | 83% | 1270 fps | 100% |
| Winchester 572² | <<locked>> | 68% | 38,130 psi | 86% | 1398 fps | 97.4% |
| Winchester AutoComp ᴾ | <<locked>> | 100% | 39,682 psi | 90% | 1342 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% | 16,607 psi | 38% | 974 fps | 90.9% |
| Accurate No. 5*² | <<locked>> | 60% | 24,236 psi | 55% | 1184 fps | 87.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 18,565 psi | 42% | 974 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 14,808 psi | 33% | 935 fps | 97.7% |
| ADI AP 100* | <<locked>> | 96% | 24,134 psi | 55% | 1178 fps | 85.1% |
| ADI AP 70N² | <<locked>> | 60% | 20,987 psi | 47% | 1079 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 21,509 psi | 49% | 928 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 20,320 psi | 46% | 942 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 18,028 psi | 41% | 942 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 19,508 psi | 44% | 1007 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 15,040 psi | 34% | 948 fps | 99.4% |
| Alliant BULLSEYE² | 4.3 gr | 60% | 19,305 psi | 44% | 1063 fps | 96.6% |
| Alliant Green Dot² | <<locked>> | 60% | 17,579 psi | 40% | 971 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,863 psi | 25% | 840 fps | 86.5% |
| Alliant POWER PISTOL* | <<locked>> | 84% | 26,818 psi | 61% | 1266 fps | 86.1% |
| Alliant RED DOT² | <<locked>> | 60% | 17,245 psi | 39% | 945 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 21,843 psi | 49% | 1119 fps | 97.3% |
| Alliant UNIQUE*² | <<locked>> | 60% | 14,649 psi | 33% | 961 fps | 91.9% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 17,013 psi | 38% | 955 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,124 psi | 23% | 810 fps | 98.6% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 17,216 psi | 39% | 991 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 27,137 psi | 61% | 1188 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 16,679 psi | 38% | 876 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 29,298 psi | 66% | 1184 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 19,885 psi | 45% | 1086 fps | 86.6% |
| Hodgdon Longshot*² | <<locked>> | 60% | 21,901 psi | 50% | 1132 fps | 90.6% |
| Hodgdon TiteGroup² | <<locked>> | 60% | 35,186 psi | 80% | 1207 fps | 100% |
| Hodgdon TrailBoss*² | <<locked>> | 60% | 5,671 psi | 13% | 597 fps | 94.7% |
| Hodgdon Universal² | <<locked>> | 60% | 17,782 psi | 40% | 1014 fps | 99.5% |
| Lovex D036*² | <<locked>> | 60% | 24,192 psi | 55% | 1181 fps | 87.5% |
| Lovex S011² | <<locked>> | 60% | 22,727 psi | 51% | 1070 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 16,505 psi | 37% | 997 fps | 96.1% |
| Maxam CSB 1² | <<locked>> | 60% | 13,619 psi | 31% | 902 fps | 96.9% |
| Maxam CSB 2² | <<locked>> | 60% | 13,561 psi | 31% | 935 fps | 99.8% |
| Maxam CSB 3² | <<locked>> | 60% | 15,954 psi | 36% | 948 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 18,014 psi | 41% | 978 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 20,015 psi | 45% | 978 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 20,059 psi | 45% | 1086 fps | 94.3% |
| Ramshot True Blue*² | <<locked>> | 60% | 23,177 psi | 52% | 1152 fps | 91.6% |
| Ramshot Zip² | <<locked>> | 60% | 29,196 psi | 66% | 1191 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 18,434 psi | 42% | 1033 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,236 psi | 12% | 581 fps | 88.3% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 12,459 psi | 28% | 919 fps | 91.6% |
| Rottweil P 801² | <<locked>> | 60% | 21,857 psi | 49% | 1060 fps | 100% |
| Rottweil P 806* | <<locked>> | 88% | 19,363 psi | 44% | 1188 fps | 86.9% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 24,192 psi | 55% | 1181 fps | 87.5% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,315 psi | 32% | 915 fps | 91.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 17,912 psi | 40% | 991 fps | 99.8% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 17,114 psi | 39% | 978 fps | 97.6% |
| SNPE Vectan BA10² | <<locked>> | 60% | 22,292 psi | 50% | 971 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 76% | 17,985 psi | 41% | 1030 fps | 86.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 16,592 psi | 38% | 981 fps | 98.5% |
| SNPE Vectan SP 2*² | <<locked>> | 76% | 22,394 psi | 51% | 1207 fps | 85.3% |
| Somchem MP200*² | 4.8 gr | 60% | 17,042 psi | 39% | 1010 fps | 92.8% |
| Somchem MS200*² | <<locked>> | 60% | 15,447 psi | 35% | 958 fps | 93.9% |
| Somchem S221* | <<locked>> | 80% | 33,402 psi | 76% | 1345 fps | 86.8% |
| Vihtavuori 3N37*² | 5.8 gr | 68% | 16,476 psi | 37% | 1024 fps | 86.1% |
| Vihtavuori N310² | <<locked>> | 60% | 27,615 psi | 62% | 1056 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 18,086 psi | 41% | 997 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,137 psi | 21% | 745 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 16,302 psi | 37% | 1007 fps | 99.5% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,837 psi | 34% | 951 fps | 92.6% |
| Vihtavuori N350*² | <<locked>> | 72% | 15,838 psi | 36% | 1007 fps | 85.8% |
| Winchester 231² | <<locked>> | 60% | 23,380 psi | 53% | 1102 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 31,836 psi | 72% | 1214 fps | 100% |
| Winchester 572*² | <<locked>> | 60% | 28,616 psi | 65% | 1260 fps | 94% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,402 psi | 33% | 935 fps | 96.4% |
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 67 powders for .357 SIG loaded with the .358 | 120gr | Rim Rock TC Cowboy. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,444 fps; across all powders the maximum-charge window runs from 810 fps to 1,444 fps. ADI AP 100 gives the best case fill at 100 %, and 53 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 24–90 %, leaving at least 10 % headroom. ADI AP 100, Alliant Herco, Alliant UNIQUE 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. Alliant BULLSEYE, Somchem MP200, Vihtavuori 3N37 rank at the top here: for .357 SIG with the .358 | 120gr | Rim Rock TC Cowboy they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 5, ADI AP 100, Alliant POWER PISTOL 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.