Load Specifications
Load data in caliber .357 SIG with .357 | 125gr | Speer JHP bullet and 66 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant UNIQUE, 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>> | 84% | 38,305 psi | 87% | 1325 fps | 100% |
| Accurate No. 5² | <<locked>> | 68% | 35,433 psi | 80% | 1368 fps | 95.3% |
| Accurate Solo 1000 | <<locked>> | 88% | 38,885 psi | 88% | 1247 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 92% | 37,739 psi | 85% | 1296 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 29,457 psi | 67% | 1273 fps | 90.6% |
| ADI AP 70N² | <<locked>> | 76% | 36,796 psi | 83% | 1302 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 39,015 psi | 88% | 1135 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 38,247 psi | 86% | 1161 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 37,869 psi | 86% | 1207 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 38,740 psi | 88% | 1263 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 39,276 psi | 89% | 1302 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 80% | 37,086 psi | 84% | 1355 fps | 100% |
| Alliant Green Dot | <<locked>> | 88% | 38,116 psi | 86% | 1260 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 30,676 psi | 69% | 1273 fps | 100% |
| Alliant POWER PISTOL* | <<locked>> | 92% | 37,739 psi | 85% | 1444 fps | 93.7% |
| Alliant RED DOT | <<locked>> | 92% | 39,595 psi | 90% | 1247 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 37,608 psi | 85% | 1362 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 39,987 psi | 90% | 1398 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 38,522 psi | 87% | 1250 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 30,864 psi | 70% | 1184 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 80% | 35,157 psi | 79% | 1240 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 38,725 psi | 88% | 1329 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 38,783 psi | 88% | 1168 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 36,593 psi | 83% | 1266 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 37,942 psi | 86% | 1388 fps | 97.6% |
| Hodgdon Longshot² | <<locked>> | 72% | 37,391 psi | 85% | 1378 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,923 psi | 29% | 843 fps | 100% |
| Hodgdon Universal | <<locked>> | 84% | 36,796 psi | 83% | 1302 fps | 100% |
| Lovex D036² | <<locked>> | 68% | 35,375 psi | 80% | 1368 fps | 95.2% |
| Lovex S011² | <<locked>> | 76% | 39,436 psi | 89% | 1283 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 37,971 psi | 86% | 1329 fps | 100% |
| Maxam CSB 1 | <<locked>> | 96% | 37,449 psi | 85% | 1289 fps | 100% |
| Maxam CSB 2 | <<locked>> | 92% | 36,854 psi | 83% | 1293 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 39,871 psi | 90% | 1293 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 39,334 psi | 89% | 1263 fps | 100% |
| Maxam CSB 5 | <<locked>> | 80% | 36,361 psi | 82% | 1181 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 37,072 psi | 84% | 1358 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 39,102 psi | 88% | 1394 fps | 99% |
| Ramshot Zip² | <<locked>> | 64% | 36,376 psi | 82% | 1270 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 80% | 37,028 psi | 84% | 1280 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,792 psi | 27% | 840 fps | 99.8% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 38,493 psi | 87% | 1378 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 96% | 38,435 psi | 87% | 1437 fps | 87.6% |
| Rottweil P 801² | <<locked>> | 76% | 38,986 psi | 88% | 1263 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 34,940 psi | 79% | 1450 fps | 97.4% |
| Shooters World Auto Pistol² | <<locked>> | 68% | 35,375 psi | 80% | 1368 fps | 95.2% |
| SNPE Vectan A0 | <<locked>> | 96% | 38,435 psi | 87% | 1329 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 84% | 37,173 psi | 84% | 1270 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 39,276 psi | 89% | 1312 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 39,479 psi | 89% | 1175 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 36,811 psi | 83% | 1355 fps | 98.1% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 37,666 psi | 85% | 1306 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 88% | 36,883 psi | 83% | 1450 fps | 95.2% |
| Somchem MP200 | <<locked>> | 84% | 36,390 psi | 82% | 1342 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 39,218 psi | 89% | 1352 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 37,840 psi | 86% | 1411 fps | 90.9% |
| Vihtavuori 3N37 | <<locked>> | 92% | 36,027 psi | 81% | 1371 fps | 98.7% |
| Vihtavuori N310² | <<locked>> | 68% | 38,885 psi | 88% | 1171 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 38,116 psi | 86% | 1257 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 24,743 psi | 56% | 1037 fps | 100% |
| Vihtavuori N330 | <<locked>> | 84% | 37,275 psi | 84% | 1309 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 39,247 psi | 89% | 1355 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 38,116 psi | 86% | 1391 fps | 99.2% |
| Winchester 231² | <<locked>> | 72% | 36,376 psi | 82% | 1270 fps | 100% |
| Winchester 572² | <<locked>> | 64% | 36,680 psi | 83% | 1378 fps | 98.1% |
| Winchester AutoComp | <<locked>> | 92% | 36,985 psi | 84% | 1306 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% | 18,521 psi | 42% | 1017 fps | 94.3% |
| Accurate No. 5*² | <<locked>> | 60% | 26,760 psi | 60% | 1230 fps | 91.1% |
| Accurate Solo 1000² | <<locked>> | 60% | 20,233 psi | 46% | 997 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 16,244 psi | 37% | 965 fps | 99.2% |
| ADI AP 100* | <<locked>> | 88% | 22,133 psi | 50% | 1138 fps | 85.5% |
| ADI AP 70N² | <<locked>> | 60% | 23,206 psi | 52% | 1112 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,568 psi | 51% | 938 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 22,031 psi | 50% | 961 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 19,943 psi | 45% | 968 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 21,176 psi | 48% | 1030 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 16,766 psi | 38% | 978 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 60% | 21,422 psi | 48% | 1106 fps | 98.6% |
| Alliant Green Dot² | <<locked>> | 60% | 19,305 psi | 44% | 997 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,792 psi | 27% | 869 fps | 89.9% |
| Alliant POWER PISTOL*² | <<locked>> | 76% | 24,004 psi | 54% | 1211 fps | 86% |
| Alliant RED DOT² | <<locked>> | 60% | 19,247 psi | 44% | 974 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 23,815 psi | 54% | 1152 fps | 99% |
| Alliant UNIQUE*² | 4.6 gr | 60% | 15,911 psi | 36% | 991 fps | 94.7% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 18,521 psi | 42% | 978 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,255 psi | 25% | 837 fps | 99.8% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 19,769 psi | 45% | 1030 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 29,660 psi | 67% | 1217 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,593 psi | 40% | 886 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 32,256 psi | 73% | 1214 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 22,234 psi | 50% | 1135 fps | 90.5% |
| Hodgdon Longshot*² | <<locked>> | 60% | 24,482 psi | 55% | 1181 fps | 94% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 6,092 psi | 14% | 614 fps | 96.9% |
| Hodgdon Universal² | <<locked>> | 60% | 19,305 psi | 44% | 1040 fps | 100% |
| Lovex D036*² | <<locked>> | 60% | 26,701 psi | 60% | 1230 fps | 91.1% |
| Lovex S011² | <<locked>> | 60% | 25,034 psi | 57% | 1102 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 18,521 psi | 42% | 1037 fps | 98.4% |
| Maxam CSB 1² | <<locked>> | 60% | 15,635 psi | 35% | 948 fps | 99% |
| Maxam CSB 2² | <<locked>> | 60% | 15,925 psi | 36% | 981 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 17,521 psi | 40% | 974 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 19,711 psi | 45% | 1001 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 22,017 psi | 50% | 1001 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 23,003 psi | 52% | 1142 fps | 97.3% |
| Ramshot True Blue*² | <<locked>> | 60% | 25,715 psi | 58% | 1198 fps | 94.8% |
| Ramshot Zip² | <<locked>> | 60% | 32,053 psi | 72% | 1220 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 21,060 psi | 48% | 1066 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,874 psi | 13% | 610 fps | 92.1% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 14,141 psi | 32% | 965 fps | 95.3% |
| ReloadSwiss RS 24* | <<locked>> | 92% | 34,577 psi | 78% | 1385 fps | 85.8% |
| Rottweil P 801² | <<locked>> | 60% | 24,381 psi | 55% | 1086 fps | 100% |
| Rottweil P 806* | <<locked>> | 80% | 18,072 psi | 41% | 1145 fps | 87.3% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 26,701 psi | 60% | 1230 fps | 91.1% |
| SNPE Vectan A0*² | <<locked>> | 60% | 15,418 psi | 35% | 945 fps | 94% |
| SNPE Vectan A1² | <<locked>> | 60% | 19,667 psi | 44% | 1020 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 18,855 psi | 43% | 1014 fps | 99.3% |
| SNPE Vectan BA10² | <<locked>> | 60% | 23,931 psi | 54% | 991 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 16,331 psi | 37% | 991 fps | 86.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 18,637 psi | 42% | 1020 fps | 99.8% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 23,047 psi | 52% | 1217 fps | 87.7% |
| Somchem MP200² | 5.3 gr | 60% | 18,739 psi | 42% | 1047 fps | 95.6% |
| Somchem MS200² | <<locked>> | 60% | 17,289 psi | 39% | 1001 fps | 96.7% |
| Somchem S221*² | <<locked>> | 72% | 29,254 psi | 66% | 1283 fps | 86.6% |
| Vihtavuori 3N37*² | 6 gr | 64% | 16,114 psi | 36% | 1010 fps | 87.5% |
| Vihtavuori N310² | <<locked>> | 60% | 30,951 psi | 70% | 1089 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 19,885 psi | 45% | 1020 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 10,095 psi | 23% | 761 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 17,854 psi | 40% | 1027 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 16,012 psi | 36% | 978 fps | 95.2% |
| Vihtavuori N350*² | <<locked>> | 64% | 13,938 psi | 32% | 951 fps | 85.2% |
| Winchester 231² | <<locked>> | 60% | 25,367 psi | 57% | 1125 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 31,749 psi | 72% | 1309 fps | 96.7% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,969 psi | 36% | 968 fps | 98.5% |
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 .357 | 125gr | Speer JHP. Rottweil P 806 delivers the highest muzzle velocity at 1,450 fps; across all powders the maximum-charge window runs from 840 fps to 1,450 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 27–90 %, 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. Alliant UNIQUE, Somchem MP200, Vihtavuori 3N37 rank at the top here: for .357 SIG with the .357 | 125gr | Speer JHP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AP 100, Alliant POWER PISTOL, ReloadSwiss RS 24 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.