Load Specifications
Load data in caliber .357 SIG with .355 | 124gr | Prvi Partizan FMJ 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% | 36,143 psi | 82% | 1289 fps | 99.8% |
| Accurate No. 5² | <<locked>> | 72% | 38,551 psi | 87% | 1401 fps | 95.7% |
| Accurate Solo 1000 | <<locked>> | 88% | 37,826 psi | 86% | 1230 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 39,494 psi | 89% | 1306 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 27,615 psi | 62% | 1234 fps | 88.8% |
| ADI AP 70N | <<locked>> | 80% | 39,465 psi | 89% | 1325 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 38,914 psi | 88% | 1129 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 39,653 psi | 90% | 1168 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 37,840 psi | 86% | 1201 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 36,303 psi | 82% | 1234 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 37,768 psi | 85% | 1280 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 38,537 psi | 87% | 1362 fps | 100% |
| Alliant Green Dot | <<locked>> | 92% | 39,494 psi | 89% | 1270 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 29,356 psi | 66% | 1247 fps | 99.9% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 38,841 psi | 88% | 1447 fps | 93.4% |
| Alliant RED DOT | <<locked>> | 92% | 38,218 psi | 86% | 1227 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 36,782 psi | 83% | 1345 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 38,203 psi | 86% | 1371 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 37,594 psi | 85% | 1234 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 30,240 psi | 68% | 1171 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 38,087 psi | 86% | 1266 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 37,101 psi | 84% | 1302 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 37,724 psi | 85% | 1148 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 35,737 psi | 81% | 1250 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 35,969 psi | 81% | 1352 fps | 96.6% |
| Hodgdon Longshot² | <<locked>> | 72% | 35,331 psi | 80% | 1342 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,444 psi | 28% | 830 fps | 100% |
| Hodgdon Universal | <<locked>> | 88% | 38,232 psi | 86% | 1316 fps | 100% |
| Lovex D036² | <<locked>> | 72% | 38,493 psi | 87% | 1401 fps | 95.7% |
| Lovex S011² | <<locked>> | 76% | 37,217 psi | 84% | 1250 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 39,914 psi | 90% | 1342 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 39,102 psi | 88% | 1299 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 38,232 psi | 86% | 1306 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 37,652 psi | 85% | 1263 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 36,941 psi | 84% | 1234 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 38,899 psi | 88% | 1204 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 35,679 psi | 81% | 1332 fps | 99.9% |
| Ramshot True Blue² | <<locked>> | 72% | 37,072 psi | 84% | 1358 fps | 98.3% |
| Ramshot Zip² | <<locked>> | 68% | 39,102 psi | 88% | 1296 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 39,566 psi | 89% | 1302 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,342 psi | 26% | 823 fps | 99.4% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 36,709 psi | 83% | 1355 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 36,637 psi | 83% | 1234 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 31,836 psi | 72% | 1398 fps | 95.9% |
| Shooters World Auto Pistol² | <<locked>> | 72% | 38,493 psi | 87% | 1401 fps | 95.7% |
| SNPE Vectan A0 | <<locked>> | 96% | 36,883 psi | 83% | 1302 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 38,928 psi | 88% | 1283 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 37,695 psi | 85% | 1286 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 38,334 psi | 87% | 1155 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 34,882 psi | 79% | 1319 fps | 97.2% |
| SNPE Vectan BA9 1/2 | <<locked>> | 92% | 39,305 psi | 89% | 1316 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 92% | 39,001 psi | 88% | 1470 fps | 95.4% |
| Somchem MP200 | <<locked>> | 88% | 38,145 psi | 86% | 1355 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 37,463 psi | 85% | 1325 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 36,303 psi | 82% | 1378 fps | 89.5% |
| Vihtavuori 3N37 | <<locked>> | 96% | 38,159 psi | 86% | 1388 fps | 98.7% |
| Vihtavuori N310² | <<locked>> | 68% | 37,202 psi | 84% | 1152 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 36,854 psi | 83% | 1240 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 23,612 psi | 53% | 1020 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 38,928 psi | 88% | 1322 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 37,478 psi | 85% | 1325 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 35,810 psi | 81% | 1355 fps | 98.5% |
| Winchester 231² | <<locked>> | 76% | 39,102 psi | 88% | 1296 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 38,508 psi | 87% | 1276 fps | 100% |
| Winchester 572² | <<locked>> | 68% | 39,711 psi | 90% | 1407 fps | 98.4% |
| Winchester AutoComp | <<locked>> | 96% | 38,827 psi | 88% | 1319 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% | 17,463 psi | 39% | 988 fps | 92.8% |
| Accurate No. 5*² | <<locked>> | 60% | 25,454 psi | 58% | 1201 fps | 89.7% |
| Accurate Solo 1000² | <<locked>> | 60% | 19,653 psi | 44% | 981 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 15,766 psi | 36% | 951 fps | 98.8% |
| ADI AP 100* | <<locked>> | 92% | 23,105 psi | 52% | 1152 fps | 85.6% |
| ADI AP 70N² | <<locked>> | 60% | 22,002 psi | 50% | 1086 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,829 psi | 52% | 938 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 20,508 psi | 46% | 932 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 19,247 psi | 44% | 951 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 20,624 psi | 47% | 1014 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 15,838 psi | 36% | 955 fps | 99.8% |
| Alliant BULLSEYE² | <<locked>> | 60% | 20,233 psi | 46% | 1073 fps | 97.8% |
| Alliant Green Dot² | <<locked>> | 60% | 18,695 psi | 42% | 981 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,487 psi | 26% | 856 fps | 88.7% |
| Alliant POWER PISTOL* | <<locked>> | 80% | 25,744 psi | 58% | 1237 fps | 86.6% |
| Alliant RED DOT² | <<locked>> | 60% | 18,507 psi | 42% | 958 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 22,727 psi | 51% | 1125 fps | 98.3% |
| Alliant UNIQUE*² | 4.4 gr | 60% | 15,505 psi | 35% | 974 fps | 93.8% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 17,999 psi | 41% | 965 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,863 psi | 25% | 823 fps | 99.5% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 18,463 psi | 42% | 1004 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 28,892 psi | 65% | 1201 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,782 psi | 40% | 886 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 31,227 psi | 71% | 1198 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 21,060 psi | 48% | 1106 fps | 88.9% |
| Hodgdon Longshot*² | <<locked>> | 60% | 23,206 psi | 52% | 1148 fps | 92.6% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 5,947 psi | 13% | 604 fps | 96.2% |
| Hodgdon Universal² | <<locked>> | 60% | 18,826 psi | 43% | 1027 fps | 99.9% |
| Lovex D036*² | <<locked>> | 60% | 25,498 psi | 58% | 1201 fps | 89.7% |
| Lovex S011² | <<locked>> | 60% | 23,743 psi | 54% | 1076 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 17,434 psi | 39% | 1007 fps | 97.5% |
| Maxam CSB 1² | <<locked>> | 60% | 14,518 psi | 33% | 915 fps | 98.2% |
| Maxam CSB 2² | <<locked>> | 60% | 14,649 psi | 33% | 951 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 16,984 psi | 38% | 961 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 18,289 psi | 41% | 971 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 21,321 psi | 48% | 984 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 21,495 psi | 49% | 1106 fps | 96.1% |
| Ramshot True Blue*² | <<locked>> | 60% | 24,453 psi | 55% | 1168 fps | 93.5% |
| Ramshot Zip² | <<locked>> | 60% | 30,066 psi | 68% | 1188 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 20,508 psi | 46% | 1053 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,482 psi | 12% | 587 fps | 90.3% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 13,793 psi | 31% | 948 fps | 94.4% |
| Rottweil P 801² | <<locked>> | 60% | 23,975 psi | 54% | 1076 fps | 100% |
| Rottweil P 806* | <<locked>> | 80% | 16,694 psi | 38% | 1109 fps | 85.1% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 25,498 psi | 58% | 1201 fps | 89.7% |
| SNPE Vectan A0*² | <<locked>> | 60% | 15,084 psi | 34% | 928 fps | 93.1% |
| SNPE Vectan A1² | <<locked>> | 60% | 18,681 psi | 42% | 997 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 17,898 psi | 40% | 988 fps | 98.6% |
| SNPE Vectan BA10² | <<locked>> | 60% | 23,438 psi | 53% | 978 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 17,376 psi | 39% | 1010 fps | 86.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 17,506 psi | 40% | 991 fps | 99.3% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 21,683 psi | 49% | 1181 fps | 85.9% |
| Somchem MP200*² | 5 gr | 60% | 17,840 psi | 40% | 1020 fps | 94.5% |
| Somchem MS200² | <<locked>> | 60% | 16,288 psi | 37% | 971 fps | 95.5% |
| Somchem S221*² | <<locked>> | 76% | 31,691 psi | 72% | 1312 fps | 87.2% |
| Vihtavuori 3N37*² | 5.7 gr | 64% | 15,403 psi | 35% | 988 fps | 85.9% |
| Vihtavuori N310² | <<locked>> | 60% | 29,066 psi | 66% | 1063 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 19,276 psi | 44% | 1004 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,514 psi | 22% | 745 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 17,376 psi | 39% | 1017 fps | 99.9% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,650 psi | 35% | 965 fps | 94.3% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,794 psi | 33% | 971 fps | 85.6% |
| Winchester 231² | <<locked>> | 60% | 24,279 psi | 55% | 1106 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 33,808 psi | 76% | 1224 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 30,197 psi | 68% | 1276 fps | 95.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,127 psi | 34% | 945 fps | 97.6% |
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 | 124gr | Prvi Partizan FMJ. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,470 fps; across all powders the maximum-charge window runs from 823 fps to 1,470 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 26–90 %, 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 .355 | 124gr | Prvi Partizan FMJ 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.