Load Specifications
Load data in caliber .357 SIG with .355 | 124gr | Frontier RN PCB 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% | 39,726 psi | 90% | 1299 fps | 99.9% |
| Accurate No. 5² | <<locked>> | 72% | 38,305 psi | 87% | 1365 fps | 95% |
| Accurate Solo 1000 | <<locked>> | 88% | 37,623 psi | 85% | 1201 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 38,885 psi | 88% | 1273 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 28,326 psi | 64% | 1214 fps | 88.3% |
| ADI AP 70N | <<locked>> | 80% | 39,682 psi | 90% | 1299 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 37,898 psi | 86% | 1093 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 39,175 psi | 89% | 1142 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 38,000 psi | 86% | 1175 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 36,724 psi | 83% | 1207 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 38,043 psi | 86% | 1257 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 38,972 psi | 88% | 1339 fps | 100% |
| Alliant Green Dot | <<locked>> | 88% | 37,507 psi | 85% | 1220 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 30,168 psi | 68% | 1227 fps | 99.8% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 38,711 psi | 88% | 1414 fps | 92.6% |
| Alliant RED DOT | <<locked>> | 92% | 38,319 psi | 87% | 1201 fps | 100% |
| Alliant Sport Pistol | <<locked>> | 80% | 39,856 psi | 90% | 1352 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 38,580 psi | 87% | 1342 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 36,724 psi | 83% | 1198 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 30,458 psi | 69% | 1148 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 38,159 psi | 86% | 1240 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 37,449 psi | 85% | 1276 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 37,391 psi | 85% | 1122 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 35,056 psi | 79% | 1214 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 36,071 psi | 82% | 1319 fps | 96.1% |
| Hodgdon Longshot² | <<locked>> | 76% | 39,653 psi | 90% | 1365 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 13,634 psi | 31% | 820 fps | 100% |
| Hodgdon Universal | <<locked>> | 88% | 38,348 psi | 87% | 1283 fps | 100% |
| Lovex D036*² | <<locked>> | 72% | 38,247 psi | 86% | 1365 fps | 94.9% |
| Lovex S011² | <<locked>> | 76% | 37,275 psi | 84% | 1224 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 39,856 psi | 90% | 1312 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 38,856 psi | 88% | 1270 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 38,334 psi | 87% | 1276 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 38,130 psi | 86% | 1240 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 37,043 psi | 84% | 1207 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 38,566 psi | 87% | 1171 fps | 100% |
| Ramshot Silhouette | <<locked>> | 80% | 39,494 psi | 89% | 1348 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 36,956 psi | 84% | 1325 fps | 97.8% |
| Ramshot Zip² | <<locked>> | 68% | 38,769 psi | 88% | 1263 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 39,697 psi | 90% | 1273 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 12,850 psi | 29% | 823 fps | 99.8% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 36,767 psi | 83% | 1325 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 37,942 psi | 86% | 1217 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 32,155 psi | 73% | 1375 fps | 95.5% |
| Shooters World Auto Pistol*² | <<locked>> | 72% | 38,247 psi | 86% | 1365 fps | 94.9% |
| SNPE Vectan A0ᴾ | <<locked>> | 100% | 39,073 psi | 88% | 1299 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 38,682 psi | 87% | 1253 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 37,420 psi | 85% | 1257 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 37,797 psi | 85% | 1129 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 34,896 psi | 79% | 1289 fps | 96.6% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 36,724 psi | 83% | 1257 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 92% | 39,508 psi | 89% | 1444 fps | 94.9% |
| Somchem MP200 | <<locked>> | 88% | 38,595 psi | 87% | 1329 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 37,420 psi | 85% | 1293 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 36,463 psi | 82% | 1345 fps | 88.6% |
| Vihtavuori 3N37 | <<locked>> | 96% | 38,043 psi | 86% | 1355 fps | 98.3% |
| Vihtavuori N310² | <<locked>> | 68% | 38,087 psi | 86% | 1132 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 37,159 psi | 84% | 1214 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 24,424 psi | 55% | 1001 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 38,508 psi | 87% | 1289 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 37,507 psi | 85% | 1296 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 35,375 psi | 80% | 1316 fps | 97.9% |
| Winchester 231² | <<locked>> | 76% | 38,769 psi | 88% | 1263 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 39,334 psi | 89% | 1257 fps | 100% |
| Winchester 572² | <<locked>> | 64% | 34,606 psi | 78% | 1309 fps | 96.6% |
| Winchester AutoComp | <<locked>> | 96% | 38,435 psi | 87% | 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% | 18,260 psi | 41% | 974 fps | 92.8% |
| Accurate No. 5*² | <<locked>> | 60% | 25,860 psi | 58% | 1175 fps | 89.1% |
| Accurate Solo 1000² | <<locked>> | 60% | 19,943 psi | 45% | 961 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 16,621 psi | 38% | 938 fps | 98.9% |
| ADI AP 100* | <<locked>> | 92% | 23,699 psi | 54% | 1129 fps | 85.1% |
| ADI AP 70N² | <<locked>> | 60% | 23,525 psi | 53% | 1083 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,524 psi | 51% | 909 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 21,451 psi | 48% | 925 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 20,726 psi | 47% | 948 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 21,437 psi | 48% | 997 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 17,158 psi | 39% | 951 fps | 99.9% |
| Alliant BULLSEYE² | <<locked>> | 60% | 20,972 psi | 47% | 1060 fps | 97.8% |
| Alliant Green Dot² | <<locked>> | 60% | 19,450 psi | 44% | 965 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 12,865 psi | 29% | 860 fps | 90.2% |
| Alliant POWER PISTOL* | <<locked>> | 80% | 26,324 psi | 60% | 1217 fps | 86.2% |
| Alliant RED DOT² | <<locked>> | 60% | 19,058 psi | 43% | 935 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 23,728 psi | 54% | 1115 fps | 98.3% |
| Alliant UNIQUE*² | 4.1 gr | 60% | 16,781 psi | 38% | 971 fps | 94.4% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 18,855 psi | 43% | 951 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 12,038 psi | 27% | 823 fps | 99.8% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 19,537 psi | 44% | 994 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 29,051 psi | 66% | 1175 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,811 psi | 40% | 860 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 31,618 psi | 71% | 1175 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 21,625 psi | 49% | 1086 fps | 88.5% |
| Hodgdon Longshot*² | <<locked>> | 60% | 23,670 psi | 54% | 1129 fps | 92.2% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,368 psi | 17% | 614 fps | 98.4% |
| Hodgdon Universal² | <<locked>> | 60% | 20,160 psi | 46% | 1020 fps | 100% |
| Lovex D036*² | <<locked>> | 60% | 25,875 psi | 58% | 1175 fps | 89.1% |
| Lovex S011² | <<locked>> | 60% | 24,410 psi | 55% | 1060 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 18,739 psi | 42% | 1004 fps | 97.8% |
| Maxam CSB 1² | <<locked>> | 60% | 15,403 psi | 35% | 906 fps | 98.3% |
| Maxam CSB 2² | <<locked>> | 60% | 15,969 psi | 36% | 945 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 17,651 psi | 40% | 945 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 19,696 psi | 45% | 968 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 21,640 psi | 49% | 961 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 22,278 psi | 50% | 1093 fps | 96% |
| Ramshot True Blue*² | <<locked>> | 60% | 24,889 psi | 56% | 1145 fps | 93% |
| Ramshot Zip² | <<locked>> | 60% | 30,516 psi | 69% | 1165 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 21,263 psi | 48% | 1033 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 7,310 psi | 17% | 620 fps | 94.8% |
| ReloadSwiss RS 20*² | <<locked>> | 60% | 14,344 psi | 32% | 932 fps | 94.4% |
| Rottweil P 801² | <<locked>> | 60% | 24,685 psi | 56% | 1056 fps | 100% |
| Rottweil P 806* | <<locked>> | 80% | 17,622 psi | 40% | 1106 fps | 85.5% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 25,875 psi | 58% | 1175 fps | 89.1% |
| SNPE Vectan A0*² | <<locked>> | 60% | 15,345 psi | 35% | 906 fps | 92.8% |
| SNPE Vectan A1² | <<locked>> | 60% | 19,638 psi | 44% | 988 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 18,797 psi | 42% | 978 fps | 98.7% |
| SNPE Vectan BA10² | <<locked>> | 60% | 23,482 psi | 53% | 955 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 18,347 psi | 41% | 1001 fps | 87% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 18,507 psi | 42% | 981 fps | 99.4% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 21,915 psi | 50% | 1155 fps | 85.2% |
| Somchem MP200*² | 4.6 gr | 60% | 18,507 psi | 42% | 1004 fps | 94.4% |
| Somchem MS200² | <<locked>> | 60% | 17,289 psi | 39% | 961 fps | 95.8% |
| Somchem S221*² | <<locked>> | 76% | 31,792 psi | 72% | 1276 fps | 86.2% |
| Vihtavuori 3N37*² | 5.3 gr | 64% | 16,404 psi | 37% | 981 fps | 86.4% |
| Vihtavuori N310² | <<locked>> | 60% | 29,559 psi | 67% | 1040 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 20,102 psi | 45% | 991 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 11,139 psi | 25% | 748 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 18,478 psi | 42% | 1010 fps | 100% |
| Vihtavuori N340*² | <<locked>> | 60% | 16,839 psi | 38% | 961 fps | 94.8% |
| Vihtavuori N350*² | <<locked>> | 68% | 15,635 psi | 35% | 961 fps | 85.9% |
| Winchester 231² | <<locked>> | 60% | 25,527 psi | 58% | 1096 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 34,301 psi | 78% | 1201 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 30,414 psi | 69% | 1247 fps | 95% |
| Winchester AutoComp ² | <<locked>> | 60% | 15,983 psi | 36% | 932 fps | 97.8% |
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 | 124gr | Frontier RN PCB. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,444 fps; across all powders the maximum-charge window runs from 820 fps to 1,444 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 29–90 %, 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 | Frontier RN PCB they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AP 100, Alliant POWER PISTOL, Lovex D036 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.