Load Specifications
Load data in caliber .357 SIG with .355 | 125gr | Speer TMJ bullet and 67 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 ReloadSwiss RS 20.
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% | 38,566 psi | 87% | 1325 fps | 100% |
| Accurate No. 5² | <<locked>> | 68% | 35,694 psi | 81% | 1371 fps | 95.3% |
| Accurate Solo 1000 | <<locked>> | 88% | 39,073 psi | 88% | 1250 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 92% | 37,956 psi | 86% | 1296 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 28,863 psi | 65% | 1263 fps | 90.2% |
| ADI AP 70N² | <<locked>> | 76% | 37,057 psi | 84% | 1306 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 39,233 psi | 89% | 1135 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 37,188 psi | 84% | 1152 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 38,101 psi | 86% | 1207 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 37,666 psi | 85% | 1253 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 39,523 psi | 89% | 1302 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 80% | 36,114 psi | 82% | 1342 fps | 100% |
| Alliant Green Dot | <<locked>> | 88% | 38,276 psi | 87% | 1263 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 30,879 psi | 70% | 1273 fps | 100% |
| Alliant POWER PISTOL* | <<locked>> | 92% | 36,985 psi | 84% | 1430 fps | 93.3% |
| Alliant RED DOT | <<locked>> | 92% | 39,842 psi | 90% | 1250 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 37,797 psi | 85% | 1362 fps | 100% |
| Alliant UNIQUE | <<locked>> | 92% | 36,869 psi | 83% | 1362 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 38,696 psi | 87% | 1250 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 31,024 psi | 70% | 1184 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 39,320 psi | 89% | 1283 fps | 100% |
| Hodgdon CFE Pistol | <<locked>> | 88% | 38,145 psi | 86% | 1312 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 39,001 psi | 88% | 1168 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 36,782 psi | 83% | 1266 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 38,247 psi | 86% | 1391 fps | 97.7% |
| Hodgdon Longshot² | <<locked>> | 72% | 36,695 psi | 83% | 1368 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,995 psi | 29% | 843 fps | 100% |
| Hodgdon Universal | <<locked>> | 84% | 35,911 psi | 81% | 1293 fps | 100% |
| Lovex D036² | <<locked>> | 68% | 35,650 psi | 81% | 1371 fps | 95.3% |
| Lovex S011² | <<locked>> | 76% | 39,697 psi | 90% | 1283 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 38,276 psi | 87% | 1332 fps | 100% |
| Maxam CSB 1 | <<locked>> | 96% | 37,652 psi | 85% | 1289 fps | 100% |
| Maxam CSB 2 | <<locked>> | 92% | 37,028 psi | 84% | 1296 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 38,885 psi | 88% | 1280 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 38,290 psi | 87% | 1253 fps | 100% |
| Maxam CSB 5 | <<locked>> | 80% | 36,521 psi | 83% | 1184 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 37,289 psi | 84% | 1358 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 38,392 psi | 87% | 1385 fps | 98.9% |
| Ramshot Zip² | <<locked>> | 64% | 35,447 psi | 80% | 1260 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 80% | 37,188 psi | 84% | 1280 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,850 psi | 27% | 840 fps | 99.8% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 38,769 psi | 88% | 1381 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 96% | 38,725 psi | 88% | 1440 fps | 87.7% |
| Rottweil P 801² | <<locked>> | 76% | 39,160 psi | 89% | 1266 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 34,374 psi | 78% | 1440 fps | 97.2% |
| Shooters World Auto Pistol² | <<locked>> | 68% | 35,650 psi | 81% | 1371 fps | 95.3% |
| SNPE Vectan A0 | <<locked>> | 96% | 38,638 psi | 87% | 1332 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 84% | 37,420 psi | 85% | 1273 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 39,479 psi | 89% | 1312 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 38,406 psi | 87% | 1165 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 37,057 psi | 84% | 1355 fps | 98.1% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 37,927 psi | 86% | 1306 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 88% | 37,159 psi | 84% | 1453 fps | 95.3% |
| Somchem MP200 | <<locked>> | 88% | 39,914 psi | 90% | 1385 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 39,392 psi | 89% | 1355 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 38,087 psi | 86% | 1414 fps | 91% |
| Vihtavuori 3N37 | <<locked>> | 92% | 36,216 psi | 82% | 1371 fps | 98.7% |
| Vihtavuori N310² | <<locked>> | 68% | 37,652 psi | 85% | 1161 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 38,334 psi | 87% | 1260 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 24,860 psi | 56% | 1037 fps | 100% |
| Vihtavuori N330 | <<locked>> | 84% | 37,492 psi | 85% | 1312 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 39,436 psi | 89% | 1355 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 38,392 psi | 87% | 1394 fps | 99.2% |
| Winchester 231² | <<locked>> | 72% | 36,579 psi | 83% | 1273 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 39,566 psi | 89% | 1293 fps | 100% |
| Winchester 572² | <<locked>> | 64% | 36,898 psi | 83% | 1381 fps | 98.2% |
| Winchester AutoComp | <<locked>> | 92% | 36,172 psi | 82% | 1296 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% | 18,608 psi | 42% | 1017 fps | 94.3% |
| Accurate No. 5*² | <<locked>> | 60% | 26,876 psi | 61% | 1230 fps | 91.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 20,305 psi | 46% | 997 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 16,302 psi | 37% | 968 fps | 99.3% |
| ADI AP 100* | <<locked>> | 88% | 22,234 psi | 50% | 1142 fps | 85.6% |
| ADI AP 70N² | <<locked>> | 60% | 23,322 psi | 53% | 1115 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,655 psi | 51% | 938 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 21,234 psi | 48% | 948 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 20,030 psi | 45% | 971 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 21,263 psi | 48% | 1030 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 16,868 psi | 38% | 981 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 60% | 21,553 psi | 49% | 1106 fps | 98.7% |
| Alliant Green Dot² | <<locked>> | 60% | 19,363 psi | 44% | 997 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,850 psi | 27% | 869 fps | 89.9% |
| Alliant POWER PISTOL*² | <<locked>> | 76% | 24,105 psi | 54% | 1214 fps | 86.1% |
| Alliant RED DOT² | <<locked>> | 60% | 19,334 psi | 44% | 974 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 23,931 psi | 54% | 1155 fps | 99% |
| Alliant UNIQUE*² | 4.6 gr | 60% | 15,998 psi | 36% | 991 fps | 94.7% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 18,594 psi | 42% | 981 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,313 psi | 26% | 837 fps | 99.8% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 19,203 psi | 43% | 1020 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 18,144 psi | 41% | 1014 fps | 99.6% |
| Hodgdon Clays² | <<locked>> | 60% | 17,695 psi | 40% | 889 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 32,387 psi | 73% | 1214 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 22,379 psi | 51% | 1138 fps | 90.6% |
| Hodgdon Longshot*² | <<locked>> | 60% | 24,598 psi | 56% | 1181 fps | 94.1% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 6,106 psi | 14% | 614 fps | 96.9% |
| Hodgdon Universal² | <<locked>> | 60% | 19,377 psi | 44% | 1040 fps | 100% |
| Lovex D036*² | <<locked>> | 60% | 26,832 psi | 61% | 1234 fps | 91.2% |
| Lovex S011² | <<locked>> | 60% | 25,150 psi | 57% | 1102 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 18,623 psi | 42% | 1037 fps | 98.4% |
| Maxam CSB 1² | <<locked>> | 60% | 15,055 psi | 34% | 932 fps | 98.8% |
| Maxam CSB 2² | <<locked>> | 60% | 16,012 psi | 36% | 981 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 17,637 psi | 40% | 978 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 18,971 psi | 43% | 988 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 22,147 psi | 50% | 1001 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 22,365 psi | 51% | 1129 fps | 97% |
| Ramshot True Blue*² | <<locked>> | 60% | 25,831 psi | 58% | 1201 fps | 94.8% |
| Ramshot Zip² | <<locked>> | 60% | 31,198 psi | 71% | 1207 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 21,161 psi | 48% | 1066 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,903 psi | 13% | 610 fps | 92.1% |
| ReloadSwiss RS 20² | 4.8 gr | 60% | 14,199 psi | 32% | 965 fps | 95.3% |
| ReloadSwiss RS 24* | <<locked>> | 92% | 34,824 psi | 79% | 1385 fps | 85.8% |
| Rottweil P 801² | <<locked>> | 60% | 24,497 psi | 55% | 1089 fps | 100% |
| Rottweil P 806* | <<locked>> | 80% | 18,144 psi | 41% | 1145 fps | 87.3% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 26,832 psi | 61% | 1234 fps | 91.2% |
| SNPE Vectan A0*² | <<locked>> | 60% | 15,476 psi | 35% | 945 fps | 94.1% |
| SNPE Vectan A1² | <<locked>> | 60% | 19,769 psi | 45% | 1020 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 18,927 psi | 43% | 1014 fps | 99.3% |
| SNPE Vectan BA10² | <<locked>> | 60% | 24,062 psi | 54% | 991 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 16,404 psi | 37% | 991 fps | 86.4% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 17,985 psi | 41% | 1004 fps | 99.6% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 22,466 psi | 51% | 1204 fps | 87.2% |
| Somchem MP200² | <<locked>> | 60% | 18,826 psi | 43% | 1050 fps | 95.7% |
| Somchem MS200² | <<locked>> | 60% | 17,361 psi | 39% | 1001 fps | 96.7% |
| Somchem S221*² | <<locked>> | 72% | 29,428 psi | 67% | 1286 fps | 86.7% |
| Vihtavuori 3N37*² | 6 gr | 64% | 16,186 psi | 37% | 1014 fps | 87.6% |
| Vihtavuori N310² | <<locked>> | 60% | 31,053 psi | 70% | 1089 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 19,986 psi | 45% | 1020 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 10,138 psi | 23% | 761 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 17,941 psi | 41% | 1030 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 16,085 psi | 36% | 981 fps | 95.2% |
| Vihtavuori N350*² | <<locked>> | 64% | 13,996 psi | 32% | 951 fps | 85.2% |
| Winchester 231² | <<locked>> | 60% | 25,498 psi | 58% | 1129 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 34,911 psi | 79% | 1243 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 31,894 psi | 72% | 1309 fps | 96.7% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,490 psi | 35% | 958 fps | 98.2% |
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 43 powders for .357 SIG loaded with the .355 | 125gr | Speer TMJ. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,453 fps; across all powders the maximum-charge window runs from 840 fps to 1,453 fps. Alliant Herco gives the best case fill at 100 %, and 43 of the 43 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. Alliant Herco, Baschieri & Pellagri 102 Pistol, Hodgdon TrailBoss 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, ReloadSwiss RS 20 rank at the top here: for .357 SIG with the .355 | 125gr | Speer TMJ they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant POWER PISTOL burn incompletely and react more sensitively to barrel length and temperature. ADI APS 350, Alliant Herco, Baschieri & Pellagri 102 Pistol 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.