Load Specifications
Load data in caliber .357 SIG with .355 | 123gr | Norma FMJ TC 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 MS200.
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% | 39,407 psi | 89% | 1322 fps | 99.9% |
| Accurate No. 5² | <<locked>> | 72% | 38,029 psi | 86% | 1391 fps | 95.2% |
| Accurate Solo 1000 | <<locked>> | 88% | 37,869 psi | 86% | 1227 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 38,377 psi | 87% | 1296 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 27,137 psi | 61% | 1224 fps | 88% |
| ADI AP 70N | <<locked>> | 80% | 38,348 psi | 87% | 1316 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 37,434 psi | 85% | 1112 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 38,450 psi | 87% | 1155 fps | 100% |
| ADI AS 30 | <<locked>> | 92% | 39,175 psi | 89% | 1214 fps | 100% |
| ADI AS 50N | <<locked>> | 88% | 38,856 psi | 88% | 1260 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 36,898 psi | 83% | 1270 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 37,478 psi | 85% | 1348 fps | 100% |
| Alliant Green Dot | <<locked>> | 92% | 38,218 psi | 86% | 1257 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 28,601 psi | 65% | 1234 fps | 99.7% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 38,319 psi | 87% | 1437 fps | 92.8% |
| Alliant RED DOT | <<locked>> | 92% | 36,840 psi | 83% | 1211 fps | 100% |
| Alliant Sport Pistol | <<locked>> | 80% | 39,450 psi | 89% | 1375 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 37,304 psi | 84% | 1358 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 92% | 39,059 psi | 88% | 1247 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 29,399 psi | 66% | 1161 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 36,608 psi | 83% | 1250 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 36,245 psi | 82% | 1293 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 36,521 psi | 83% | 1135 fps | 100% |
| Hodgdon HP38² | <<locked>> | 68% | 39,595 psi | 90% | 1289 fps | 100% |
| Hodgdon HS-6 | <<locked>> | 80% | 39,885 psi | 90% | 1398 fps | 97.4% |
| Hodgdon Longshot² | <<locked>> | 76% | 39,131 psi | 88% | 1388 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,183 psi | 28% | 823 fps | 100% |
| Hodgdon Universal | <<locked>> | 88% | 37,202 psi | 84% | 1302 fps | 100% |
| Lovex D036² | <<locked>> | 72% | 37,971 psi | 86% | 1388 fps | 95.1% |
| Lovex S011² | <<locked>> | 76% | 37,347 psi | 84% | 1250 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 38,899 psi | 88% | 1329 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 38,116 psi | 86% | 1289 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 37,028 psi | 84% | 1293 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 36,535 psi | 83% | 1250 fps | 100% |
| Maxam CSB 4 | <<locked>> | 92% | 39,595 psi | 90% | 1260 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 37,463 psi | 85% | 1188 fps | 100% |
| Ramshot Silhouette | <<locked>> | 80% | 38,334 psi | 87% | 1365 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 35,476 psi | 80% | 1335 fps | 97.6% |
| Ramshot Zip² | <<locked>> | 68% | 38,087 psi | 86% | 1283 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 38,334 psi | 87% | 1289 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,095 psi | 25% | 817 fps | 99.2% |
| ReloadSwiss RS 20ᴾ | <<locked>> | 100% | 39,479 psi | 89% | 1381 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 36,709 psi | 83% | 1237 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 30,632 psi | 69% | 1381 fps | 95.1% |
| Shooters World Auto Pistol² | <<locked>> | 72% | 37,971 psi | 86% | 1388 fps | 95.1% |
| SNPE Vectan A0ᴾ | <<locked>> | 100% | 39,537 psi | 89% | 1332 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 38,145 psi | 86% | 1273 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 36,898 psi | 83% | 1276 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 37,086 psi | 84% | 1142 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 34,389 psi | 78% | 1309 fps | 96.7% |
| SNPE Vectan BA9 1/2 | <<locked>> | 92% | 38,348 psi | 87% | 1302 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 92% | 38,377 psi | 87% | 1460 fps | 94.9% |
| Somchem MP200 | <<locked>> | 88% | 37,362 psi | 84% | 1345 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 36,579 psi | 83% | 1312 fps | 100% |
| Somchem S221* | <<locked>> | 84% | 39,088 psi | 88% | 1411 fps | 90.1% |
| Vihtavuori 3N37 | <<locked>> | 96% | 37,536 psi | 85% | 1378 fps | 98.4% |
| Vihtavuori N310² | <<locked>> | 72% | 39,987 psi | 90% | 1178 fps | 100% |
| Vihtavuori N320 | <<locked>> | 88% | 39,653 psi | 90% | 1270 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 22,568 psi | 51% | 1004 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 37,782 psi | 85% | 1309 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 36,535 psi | 83% | 1312 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 35,128 psi | 79% | 1342 fps | 98.1% |
| Winchester 231² | <<locked>> | 76% | 38,087 psi | 86% | 1283 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 37,507 psi | 85% | 1263 fps | 100% |
| Winchester 572² | <<locked>> | 68% | 39,044 psi | 88% | 1394 fps | 98% |
| Winchester AutoComp | <<locked>> | 96% | 36,970 psi | 84% | 1299 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% | 17,260 psi | 39% | 981 fps | 92.2% |
| Accurate No. 5*² | <<locked>> | 60% | 24,845 psi | 56% | 1184 fps | 88.7% |
| Accurate Solo 1000² | <<locked>> | 60% | 19,348 psi | 44% | 978 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 14,779 psi | 33% | 925 fps | 98% |
| ADI AP 100* | <<locked>> | 96% | 24,729 psi | 56% | 1178 fps | 86.3% |
| ADI AP 70N² | <<locked>> | 60% | 21,799 psi | 49% | 1083 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,423 psi | 51% | 932 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 20,175 psi | 46% | 928 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 18,869 psi | 43% | 945 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 19,421 psi | 44% | 994 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 15,679 psi | 35% | 951 fps | 99.7% |
| Alliant BULLSEYE² | <<locked>> | 60% | 20,044 psi | 45% | 1070 fps | 97.5% |
| Alliant Green Dot² | <<locked>> | 60% | 18,376 psi | 42% | 974 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,863 psi | 25% | 833 fps | 87.3% |
| Alliant POWER PISTOL* | <<locked>> | 80% | 25,106 psi | 57% | 1220 fps | 85.6% |
| Alliant RED DOT² | <<locked>> | 60% | 18,115 psi | 41% | 948 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 22,611 psi | 51% | 1122 fps | 98.1% |
| Alliant UNIQUE*² | 4.3 gr | 60% | 15,287 psi | 35% | 968 fps | 93.2% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 16,984 psi | 38% | 945 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,660 psi | 24% | 817 fps | 99.3% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 17,796 psi | 40% | 991 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 27,920 psi | 63% | 1188 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,434 psi | 39% | 879 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 30,168 psi | 68% | 1181 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 20,450 psi | 46% | 1089 fps | 87.8% |
| Hodgdon Longshot*² | <<locked>> | 60% | 22,553 psi | 51% | 1135 fps | 91.8% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 5,700 psi | 13% | 591 fps | 95.3% |
| Hodgdon Universal² | <<locked>> | 60% | 17,782 psi | 40% | 1004 fps | 99.7% |
| Lovex D036*² | <<locked>> | 60% | 24,801 psi | 56% | 1184 fps | 88.7% |
| Lovex S011² | <<locked>> | 60% | 23,554 psi | 53% | 1073 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 17,231 psi | 39% | 1004 fps | 97.1% |
| Maxam CSB 1² | <<locked>> | 60% | 14,243 psi | 32% | 909 fps | 97.7% |
| Maxam CSB 2² | <<locked>> | 60% | 14,272 psi | 32% | 942 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 16,679 psi | 38% | 955 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 17,985 psi | 41% | 968 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 20,929 psi | 47% | 981 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 20,711 psi | 47% | 1089 fps | 95.3% |
| Ramshot True Blue*² | <<locked>> | 60% | 23,830 psi | 54% | 1152 fps | 92.7% |
| Ramshot Zip² | <<locked>> | 60% | 30,066 psi | 68% | 1188 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 19,348 psi | 44% | 1037 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,526 psi | 12% | 591 fps | 90% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,039 psi | 29% | 925 fps | 93.1% |
| Rottweil P 801² | <<locked>> | 60% | 22,785 psi | 52% | 1060 fps | 100% |
| Rottweil P 806* | <<locked>> | 84% | 17,767 psi | 40% | 1138 fps | 86% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 24,801 psi | 56% | 1184 fps | 88.7% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,301 psi | 32% | 906 fps | 91.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 18,536 psi | 42% | 994 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 17,782 psi | 40% | 984 fps | 98.4% |
| SNPE Vectan BA10² | <<locked>> | 60% | 23,148 psi | 52% | 974 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,781 psi | 38% | 994 fps | 85.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 17,303 psi | 39% | 984 fps | 99.1% |
| SNPE Vectan SP 2*² | <<locked>> | 76% | 23,206 psi | 52% | 1211 fps | 86.7% |
| Somchem MP200*² | <<locked>> | 60% | 17,680 psi | 40% | 1017 fps | 94% |
| Somchem MS200² | 4.3 gr | 60% | 16,070 psi | 36% | 965 fps | 95% |
| Somchem S221*² | <<locked>> | 76% | 30,414 psi | 69% | 1289 fps | 85.9% |
| Vihtavuori 3N37*² | 5.9 gr | 68% | 17,056 psi | 39% | 1030 fps | 87.5% |
| Vihtavuori N310² | <<locked>> | 60% | 28,747 psi | 65% | 1056 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 18,028 psi | 41% | 984 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,195 psi | 21% | 735 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 16,331 psi | 37% | 994 fps | 99.7% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,794 psi | 33% | 942 fps | 93.1% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,404 psi | 37% | 1010 fps | 87.2% |
| Winchester 231² | <<locked>> | 60% | 24,149 psi | 55% | 1102 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 32,735 psi | 74% | 1211 fps | 100% |
| Winchester 572*² | <<locked>> | 60% | 29,399 psi | 66% | 1260 fps | 94.9% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,373 psi | 32% | 925 fps | 96.8% |
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 .355 | 123gr | Norma FMJ TC. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,460 fps; across all powders the maximum-charge window runs from 817 fps to 1,460 fps. ADI AP 100 gives the best case fill at 100 %, and 52 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 MS200 rank at the top here: for .357 SIG with the .355 | 123gr | Norma FMJ TC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AP 100, Alliant POWER PISTOL, SNPE Vectan SP 2 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.