Load Specifications
Load data in caliber .357 SIG with .358 | 130gr | Rim Rock RNFP 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% | 37,101 psi | 84% | 1257 fps | 99.9% |
| Accurate No. 5² | <<locked>> | 72% | 39,073 psi | 88% | 1362 fps | 96.2% |
| Accurate Solo 1000 | <<locked>> | 88% | 38,189 psi | 86% | 1188 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 39,059 psi | 88% | 1257 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 27,876 psi | 63% | 1198 fps | 89.5% |
| ADI AP 70N | <<locked>> | 80% | 39,073 psi | 88% | 1276 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 38,783 psi | 88% | 1086 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 39,900 psi | 90% | 1132 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 36,695 psi | 83% | 1145 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 36,666 psi | 83% | 1194 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 37,739 psi | 85% | 1237 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 39,334 psi | 89% | 1325 fps | 100% |
| Alliant Green Dot | <<locked>> | 88% | 36,172 psi | 82% | 1191 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 29,312 psi | 66% | 1207 fps | 99.9% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 39,494 psi | 89% | 1411 fps | 94.1% |
| Alliant RED DOT | <<locked>> | 92% | 38,508 psi | 87% | 1188 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 36,405 psi | 82% | 1293 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 38,087 psi | 86% | 1322 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 36,854 psi | 83% | 1181 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 30,052 psi | 68% | 1132 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 37,536 psi | 85% | 1217 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 37,072 psi | 84% | 1257 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 37,956 psi | 86% | 1112 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 35,143 psi | 79% | 1201 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 36,637 psi | 83% | 1316 fps | 97.2% |
| Hodgdon Longshot² | <<locked>> | 72% | 35,781 psi | 81% | 1302 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,792 psi | 29% | 807 fps | 100% |
| Hodgdon Universal | <<locked>> | 88% | 37,869 psi | 86% | 1263 fps | 100% |
| Lovex D036² | <<locked>> | 72% | 39,073 psi | 88% | 1362 fps | 96.2% |
| Lovex S011² | <<locked>> | 76% | 37,753 psi | 85% | 1211 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 36,985 psi | 84% | 1266 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 38,899 psi | 88% | 1253 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 39,233 psi | 89% | 1270 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 38,319 psi | 87% | 1224 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 37,434 psi | 85% | 1194 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 39,131 psi | 88% | 1161 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 35,839 psi | 81% | 1289 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 37,579 psi | 85% | 1319 fps | 98.6% |
| Ramshot Zip² | <<locked>> | 68% | 38,754 psi | 88% | 1247 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 39,146 psi | 88% | 1253 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,182 psi | 25% | 791 fps | 99.5% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 36,811 psi | 83% | 1309 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 37,318 psi | 84% | 1198 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 32,460 psi | 73% | 1365 fps | 96.6% |
| Shooters World Auto Pistol² | <<locked>> | 72% | 39,073 psi | 88% | 1362 fps | 96.2% |
| SNPE Vectan A0 | <<locked>> | 96% | 36,738 psi | 83% | 1257 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 38,769 psi | 88% | 1237 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 37,536 psi | 85% | 1240 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 38,508 psi | 87% | 1119 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 35,317 psi | 80% | 1283 fps | 97.6% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 36,550 psi | 83% | 1240 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 92% | 39,914 psi | 90% | 1430 fps | 96.1% |
| Somchem MP200 | <<locked>> | 88% | 38,189 psi | 86% | 1309 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 37,231 psi | 84% | 1276 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 36,230 psi | 82% | 1332 fps | 89.9% |
| Vihtavuori 3N37 | <<locked>> | 96% | 38,783 psi | 88% | 1352 fps | 99.1% |
| Vihtavuori N310² | <<locked>> | 68% | 37,101 psi | 84% | 1109 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 37,391 psi | 85% | 1201 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 23,772 psi | 54% | 984 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 40,001 psi | 90% | 1286 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 37,318 psi | 84% | 1276 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 36,172 psi | 82% | 1312 fps | 98.8% |
| Winchester 231² | <<locked>> | 72% | 35,012 psi | 79% | 1204 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 39,363 psi | 89% | 1240 fps | 100% |
| Winchester 572² | <<locked>> | 64% | 35,375 psi | 80% | 1306 fps | 97.7% |
| Winchester AutoComp | <<locked>> | 96% | 39,102 psi | 88% | 1276 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% | 17,332 psi | 39% | 951 fps | 93.2% |
| Accurate No. 5*² | <<locked>> | 60% | 25,425 psi | 57% | 1158 fps | 90.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 19,305 psi | 44% | 942 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 15,548 psi | 35% | 915 fps | 98.9% |
| ADI AP 100* | <<locked>> | 92% | 23,076 psi | 52% | 1115 fps | 86.2% |
| ADI AP 70N² | <<locked>> | 60% | 21,988 psi | 50% | 1050 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,133 psi | 50% | 892 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 20,958 psi | 47% | 906 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 19,696 psi | 45% | 925 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 20,349 psi | 46% | 974 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 15,824 psi | 36% | 922 fps | 99.9% |
| Alliant BULLSEYE² | <<locked>> | 60% | 20,175 psi | 46% | 1037 fps | 98% |
| Alliant Green Dot² | <<locked>> | 60% | 18,362 psi | 42% | 942 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,400 psi | 26% | 823 fps | 89.2% |
| Alliant POWER PISTOL*² | <<locked>> | 76% | 23,380 psi | 53% | 1152 fps | 85.4% |
| Alliant RED DOT² | <<locked>> | 60% | 18,014 psi | 41% | 912 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 22,814 psi | 52% | 1089 fps | 98.6% |
| Alliant UNIQUE*² | 4.2 gr | 60% | 15,447 psi | 35% | 942 fps | 94.2% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 17,796 psi | 40% | 928 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,704 psi | 24% | 791 fps | 99.6% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 18,768 psi | 42% | 974 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 28,529 psi | 64% | 1155 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,231 psi | 39% | 846 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 31,633 psi | 72% | 1158 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 21,654 psi | 49% | 1083 fps | 89.9% |
| Hodgdon Longshot*² | <<locked>> | 60% | 23,888 psi | 54% | 1125 fps | 93.6% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 5,947 psi | 13% | 584 fps | 96.5% |
| Hodgdon Universal² | <<locked>> | 60% | 18,710 psi | 42% | 988 fps | 100% |
| Lovex D036*² | <<locked>> | 60% | 25,382 psi | 57% | 1158 fps | 90.1% |
| Lovex S011² | <<locked>> | 60% | 23,656 psi | 53% | 1037 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 17,405 psi | 39% | 974 fps | 97.8% |
| Maxam CSB 1² | <<locked>> | 60% | 14,982 psi | 34% | 896 fps | 98.7% |
| Maxam CSB 2² | <<locked>> | 60% | 15,156 psi | 34% | 928 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 17,492 psi | 40% | 938 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 18,797 psi | 42% | 948 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 20,856 psi | 47% | 945 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 21,857 psi | 49% | 1076 fps | 96.7% |
| Ramshot True Blue*² | <<locked>> | 60% | 24,337 psi | 55% | 1129 fps | 93.8% |
| Ramshot Zip² | <<locked>> | 60% | 30,472 psi | 69% | 1152 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 20,479 psi | 46% | 1017 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,482 psi | 12% | 568 fps | 90.8% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,735 psi | 31% | 919 fps | 94.8% |
| Rottweil P 801² | <<locked>> | 60% | 23,975 psi | 54% | 1040 fps | 100% |
| Rottweil P 806* | <<locked>> | 80% | 16,607 psi | 38% | 1076 fps | 85.7% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 25,382 psi | 57% | 1158 fps | 90.1% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,997 psi | 34% | 896 fps | 93.5% |
| SNPE Vectan A1² | <<locked>> | 60% | 18,666 psi | 42% | 965 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 17,898 psi | 40% | 955 fps | 98.8% |
| SNPE Vectan BA10² | <<locked>> | 60% | 24,047 psi | 54% | 951 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 15,389 psi | 35% | 928 fps | 85.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 17,390 psi | 39% | 955 fps | 99.5% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 21,741 psi | 49% | 1145 fps | 86.5% |
| Somchem MP200*² | 4.8 gr | 60% | 17,898 psi | 40% | 988 fps | 94.9% |
| Somchem MS200² | <<locked>> | 60% | 16,839 psi | 38% | 951 fps | 96.4% |
| Somchem S221*² | <<locked>> | 72% | 28,094 psi | 64% | 1214 fps | 85.7% |
| Vihtavuori 3N37*² | 5.4 gr | 64% | 15,069 psi | 34% | 948 fps | 86.2% |
| Vihtavuori N310² | <<locked>> | 60% | 30,023 psi | 68% | 1033 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 19,043 psi | 43% | 968 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,689 psi | 22% | 722 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 17,332 psi | 39% | 981 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,621 psi | 35% | 932 fps | 94.7% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,982 psi | 34% | 945 fps | 86.5% |
| Winchester 231² | <<locked>> | 60% | 24,410 psi | 55% | 1070 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 34,374 psi | 78% | 1188 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 30,110 psi | 68% | 1234 fps | 96% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,185 psi | 34% | 915 fps | 98% |
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 | 130gr | Rim Rock RNFP Cowboy. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,430 fps; across all powders the maximum-charge window runs from 791 fps to 1,430 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 25–90 %, 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 | 130gr | Rim Rock RNFP 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.