Load Specifications
Load data in caliber .357 SIG with .356 | 125gr | H&N KS HS HP 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>> | 88% | 39,218 psi | 89% | 1306 fps | 99.9% |
| Accurate No. 5² | <<locked>> | 72% | 38,145 psi | 86% | 1378 fps | 95.4% |
| Accurate Solo 1000 | <<locked>> | 88% | 37,492 psi | 85% | 1211 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 38,203 psi | 86% | 1276 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 27,137 psi | 61% | 1211 fps | 88.2% |
| ADI AP 70N | <<locked>> | 80% | 38,218 psi | 86% | 1299 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 38,276 psi | 87% | 1106 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 39,305 psi | 89% | 1152 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 36,042 psi | 81% | 1168 fps | 100% |
| ADI AS 50N | <<locked>> | 88% | 39,900 psi | 90% | 1253 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 36,825 psi | 83% | 1257 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 37,231 psi | 84% | 1332 fps | 100% |
| Alliant Green Dot | <<locked>> | 92% | 39,247 psi | 89% | 1253 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 28,572 psi | 65% | 1220 fps | 99.7% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 38,479 psi | 87% | 1424 fps | 93.1% |
| Alliant RED DOT | <<locked>> | 92% | 37,768 psi | 85% | 1207 fps | 100% |
| Alliant Sport Pistol | <<locked>> | 80% | 39,276 psi | 89% | 1358 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 37,144 psi | 84% | 1342 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 36,100 psi | 82% | 1204 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 29,240 psi | 66% | 1148 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 36,637 psi | 83% | 1237 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 36,172 psi | 82% | 1276 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 37,391 psi | 85% | 1132 fps | 100% |
| Hodgdon HP38² | <<locked>> | 68% | 39,378 psi | 89% | 1273 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 35,621 psi | 81% | 1332 fps | 96.4% |
| Hodgdon Longshot² | <<locked>> | 76% | 39,291 psi | 89% | 1375 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,473 psi | 28% | 820 fps | 100% |
| Hodgdon Universal | <<locked>> | 88% | 36,941 psi | 84% | 1283 fps | 100% |
| Lovex D036² | <<locked>> | 72% | 38,087 psi | 86% | 1375 fps | 95.3% |
| Lovex S011² | <<locked>> | 76% | 37,043 psi | 84% | 1234 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 38,682 psi | 87% | 1312 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 37,942 psi | 86% | 1273 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 36,869 psi | 83% | 1276 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 37,536 psi | 85% | 1247 fps | 100% |
| Maxam CSB 4 | <<locked>> | 92% | 39,334 psi | 89% | 1243 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 38,392 psi | 87% | 1181 fps | 100% |
| Ramshot Silhouette | <<locked>> | 80% | 39,508 psi | 89% | 1362 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 35,549 psi | 80% | 1322 fps | 97.8% |
| Ramshot Zip² | <<locked>> | 68% | 37,913 psi | 86% | 1266 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 38,058 psi | 86% | 1273 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,878 psi | 25% | 801 fps | 99.1% |
| ReloadSwiss RS 20ᴾ | <<locked>> | 100% | 39,566 psi | 89% | 1368 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 36,477 psi | 82% | 1220 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 31,067 psi | 70% | 1375 fps | 95.5% |
| Shooters World Auto Pistol² | <<locked>> | 72% | 38,087 psi | 86% | 1375 fps | 95.3% |
| SNPE Vectan A0ᴾ | <<locked>> | 100% | 39,494 psi | 89% | 1316 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 37,971 psi | 86% | 1257 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 36,782 psi | 83% | 1260 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 37,913 psi | 86% | 1138 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 34,476 psi | 78% | 1296 fps | 96.9% |
| SNPE Vectan BA9 1/2 | <<locked>> | 92% | 39,421 psi | 89% | 1299 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 92% | 38,638 psi | 87% | 1447 fps | 95.1% |
| Somchem MP200 | <<locked>> | 88% | 37,260 psi | 84% | 1325 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 36,434 psi | 82% | 1296 fps | 100% |
| Somchem S221* | <<locked>> | 84% | 39,349 psi | 89% | 1401 fps | 90.5% |
| Vihtavuori 3N37 | <<locked>> | 96% | 37,681 psi | 85% | 1365 fps | 98.5% |
| Vihtavuori N310² | <<locked>> | 68% | 36,448 psi | 82% | 1129 fps | 100% |
| Vihtavuori N320 | <<locked>> | 88% | 39,378 psi | 89% | 1250 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 23,177 psi | 52% | 1001 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 37,637 psi | 85% | 1293 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 36,434 psi | 82% | 1296 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 35,201 psi | 80% | 1329 fps | 98.2% |
| Winchester 231² | <<locked>> | 76% | 37,913 psi | 86% | 1266 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 37,246 psi | 84% | 1247 fps | 100% |
| Winchester 572² | <<locked>> | 68% | 39,073 psi | 88% | 1381 fps | 98.1% |
| Winchester AutoComp | <<locked>> | 96% | 37,072 psi | 84% | 1286 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% | 16,926 psi | 38% | 961 fps | 92.1% |
| Accurate No. 5*² | <<locked>> | 60% | 24,816 psi | 56% | 1171 fps | 89% |
| Accurate Solo 1000² | <<locked>> | 60% | 18,913 psi | 43% | 958 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 15,185 psi | 34% | 925 fps | 98.4% |
| ADI AP 100* | <<locked>> | 96% | 24,729 psi | 56% | 1168 fps | 86.5% |
| ADI AP 70N² | <<locked>> | 60% | 21,466 psi | 49% | 1066 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 21,814 psi | 49% | 909 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 20,639 psi | 47% | 922 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 19,305 psi | 44% | 942 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 19,899 psi | 45% | 991 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 15,432 psi | 35% | 935 fps | 99.7% |
| Alliant BULLSEYE² | <<locked>> | 60% | 19,682 psi | 44% | 1050 fps | 97.4% |
| Alliant Green Dot² | <<locked>> | 60% | 17,985 psi | 41% | 955 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,110 psi | 25% | 833 fps | 87.9% |
| Alliant POWER PISTOL* | <<locked>> | 80% | 25,019 psi | 57% | 1207 fps | 85.8% |
| Alliant RED DOT² | <<locked>> | 60% | 17,608 psi | 40% | 928 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 22,292 psi | 50% | 1106 fps | 98% |
| Alliant UNIQUE*² | 4.2 gr | 60% | 15,026 psi | 34% | 951 fps | 93.1% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 17,390 psi | 39% | 942 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,414 psi | 24% | 801 fps | 99.2% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 18,275 psi | 41% | 991 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 27,775 psi | 63% | 1171 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 16,940 psi | 38% | 860 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 30,980 psi | 70% | 1178 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 20,392 psi | 46% | 1076 fps | 88% |
| Hodgdon Longshot*² | <<locked>> | 60% | 23,206 psi | 52% | 1135 fps | 92.5% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 5,816 psi | 13% | 591 fps | 95.7% |
| Hodgdon Universal² | <<locked>> | 60% | 18,246 psi | 41% | 1001 fps | 99.8% |
| Lovex D036*² | <<locked>> | 60% | 24,772 psi | 56% | 1171 fps | 88.9% |
| Lovex S011² | <<locked>> | 60% | 23,177 psi | 52% | 1053 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 16,926 psi | 38% | 984 fps | 97% |
| Maxam CSB 1² | <<locked>> | 60% | 14,605 psi | 33% | 909 fps | 98.1% |
| Maxam CSB 2² | <<locked>> | 60% | 14,692 psi | 33% | 942 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 17,100 psi | 39% | 951 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 18,405 psi | 42% | 961 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 20,436 psi | 46% | 961 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 21,306 psi | 48% | 1089 fps | 95.8% |
| Ramshot True Blue*² | <<locked>> | 60% | 23,743 psi | 54% | 1142 fps | 92.8% |
| Ramshot Zip² | <<locked>> | 60% | 29,820 psi | 67% | 1171 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 19,841 psi | 45% | 1033 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,352 psi | 12% | 574 fps | 89.6% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,358 psi | 30% | 925 fps | 93.7% |
| Rottweil P 801² | <<locked>> | 60% | 23,395 psi | 53% | 1056 fps | 100% |
| Rottweil P 806* | <<locked>> | 84% | 17,898 psi | 40% | 1132 fps | 86.4% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 24,772 psi | 56% | 1171 fps | 88.9% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,620 psi | 33% | 906 fps | 92.4% |
| SNPE Vectan A1² | <<locked>> | 60% | 18,275 psi | 41% | 978 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 17,477 psi | 40% | 965 fps | 98.3% |
| SNPE Vectan BA10² | <<locked>> | 60% | 22,626 psi | 51% | 955 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 16,650 psi | 38% | 981 fps | 85.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 16,998 psi | 38% | 968 fps | 99% |
| SNPE Vectan SP 2*² | <<locked>> | 76% | 23,163 psi | 52% | 1198 fps | 86.9% |
| Somchem MP200*² | 4.8 gr | 60% | 17,463 psi | 39% | 1001 fps | 94% |
| Somchem MS200² | <<locked>> | 60% | 16,476 psi | 37% | 961 fps | 95.5% |
| Somchem S221*² | <<locked>> | 76% | 30,603 psi | 69% | 1280 fps | 86.3% |
| Vihtavuori 3N37*² | 5.8 gr | 68% | 16,926 psi | 38% | 1014 fps | 87.5% |
| Vihtavuori N310² | <<locked>> | 60% | 29,428 psi | 67% | 1053 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 18,536 psi | 42% | 981 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,398 psi | 21% | 732 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 16,853 psi | 38% | 994 fps | 99.8% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,200 psi | 34% | 942 fps | 93.7% |
| Vihtavuori N350*² | <<locked>> | 72% | 16,259 psi | 37% | 997 fps | 87.2% |
| Winchester 231² | <<locked>> | 60% | 23,888 psi | 54% | 1086 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 33,620 psi | 76% | 1207 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 29,356 psi | 66% | 1247 fps | 95.1% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,779 psi | 33% | 925 fps | 97.3% |
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 .356 | 125gr | H&N KS HS HP. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,447 fps; across all powders the maximum-charge window runs from 801 fps to 1,447 fps. ADI AP 100 gives the best case fill at 100 %, and 51 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 .356 | 125gr | H&N KS HS HP 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.