Load Specifications
Load data in caliber .357 SIG with .357 | 125gr | Hornady XTP 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 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% | 35,998 psi | 81% | 1276 fps | 99.7% |
| Accurate No. 5² | <<locked>> | 72% | 38,725 psi | 88% | 1391 fps | 95.8% |
| Accurate Solo 1000 | <<locked>> | 88% | 37,492 psi | 85% | 1214 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 39,320 psi | 89% | 1296 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 27,702 psi | 63% | 1227 fps | 88.8% |
| ADI AP 70N | <<locked>> | 80% | 39,291 psi | 89% | 1316 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 38,421 psi | 87% | 1112 fps | 100% |
| ADI APS 450 | <<locked>> | 88% | 39,320 psi | 89% | 1158 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 37,492 psi | 85% | 1188 fps | 100% |
| ADI AS 50N | <<locked>> | 88% | 39,871 psi | 90% | 1260 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 37,739 psi | 85% | 1270 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 38,334 psi | 87% | 1352 fps | 100% |
| Alliant Green Dot | <<locked>> | 92% | 39,218 psi | 89% | 1257 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 29,283 psi | 66% | 1237 fps | 99.9% |
| Alliant POWER PISTOL* | <<locked>> | 96% | 39,044 psi | 88% | 1440 fps | 93.5% |
| Alliant RED DOT | <<locked>> | 92% | 37,869 psi | 86% | 1214 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 36,637 psi | 83% | 1332 fps | 100% |
| Alliant UNIQUE | <<locked>> | 96% | 38,087 psi | 86% | 1362 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 92% | 40,030 psi | 90% | 1247 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 29,095 psi | 66% | 1148 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 37,231 psi | 84% | 1247 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 37,057 psi | 84% | 1293 fps | 100% |
| Hodgdon Claysᴾ | <<locked>> | 100% | 39,987 psi | 90% | 1161 fps | 100% |
| Hodgdon HP38² | <<locked>> | 68% | 39,218 psi | 89% | 1276 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 36,216 psi | 82% | 1345 fps | 96.7% |
| Hodgdon Longshot² | <<locked>> | 76% | 39,842 psi | 90% | 1388 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,734 psi | 29% | 830 fps | 100% |
| Hodgdon Universal | <<locked>> | 88% | 38,087 psi | 86% | 1302 fps | 100% |
| Lovex D036² | <<locked>> | 72% | 38,667 psi | 87% | 1391 fps | 95.8% |
| Lovex S011² | <<locked>> | 76% | 36,956 psi | 84% | 1237 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 39,842 psi | 90% | 1332 fps | 100% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 39,030 psi | 88% | 1289 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 38,101 psi | 86% | 1293 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 37,434 psi | 85% | 1250 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 36,622 psi | 83% | 1220 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 38,508 psi | 87% | 1188 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 35,723 psi | 81% | 1322 fps | 99.9% |
| Ramshot True Blue² | <<locked>> | 72% | 37,231 psi | 84% | 1352 fps | 98.3% |
| Ramshot Zip² | <<locked>> | 68% | 39,001 psi | 88% | 1283 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 39,334 psi | 89% | 1289 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,110 psi | 25% | 810 fps | 99.3% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 36,753 psi | 83% | 1342 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 36,390 psi | 82% | 1224 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 32,227 psi | 73% | 1398 fps | 96.1% |
| Shooters World Auto Pistol² | <<locked>> | 72% | 38,667 psi | 87% | 1391 fps | 95.8% |
| SNPE Vectan A0 | <<locked>> | 96% | 36,782 psi | 83% | 1293 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 88% | 38,928 psi | 88% | 1273 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 37,681 psi | 85% | 1276 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 37,971 psi | 86% | 1145 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 34,983 psi | 79% | 1312 fps | 97.2% |
| SNPE Vectan BA9 1/2 | <<locked>> | 92% | 39,247 psi | 89% | 1302 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 92% | 39,247 psi | 89% | 1460 fps | 95.5% |
| Somchem MP200 | <<locked>> | 88% | 38,159 psi | 86% | 1345 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 37,420 psi | 85% | 1312 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 35,592 psi | 80% | 1358 fps | 89.1% |
| Vihtavuori 3N37 | <<locked>> | 96% | 38,290 psi | 87% | 1378 fps | 98.8% |
| Vihtavuori N310² | <<locked>> | 68% | 36,637 psi | 83% | 1135 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 36,535 psi | 83% | 1227 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 23,308 psi | 53% | 1007 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 38,769 psi | 88% | 1312 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 37,434 psi | 85% | 1316 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 35,853 psi | 81% | 1345 fps | 98.5% |
| Winchester 231² | <<locked>> | 76% | 39,001 psi | 88% | 1283 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 38,348 psi | 87% | 1266 fps | 100% |
| Winchester 572² | <<locked>> | 68% | 39,827 psi | 90% | 1398 fps | 98.4% |
| Winchester AutoComp | <<locked>> | 96% | 37,710 psi | 85% | 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% | 17,143 psi | 39% | 971 fps | 92.5% |
| Accurate No. 5*² | <<locked>> | 60% | 25,454 psi | 58% | 1188 fps | 89.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 19,247 psi | 44% | 968 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 15,432 psi | 35% | 935 fps | 98.6% |
| ADI AP 100* | <<locked>> | 92% | 23,090 psi | 52% | 1142 fps | 85.5% |
| ADI AP 70N² | <<locked>> | 60% | 22,539 psi | 51% | 1089 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 22,234 psi | 50% | 922 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 20,987 psi | 47% | 935 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 19,667 psi | 44% | 951 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 20,189 psi | 46% | 997 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 15,606 psi | 35% | 942 fps | 99.8% |
| Alliant BULLSEYE² | <<locked>> | 60% | 19,899 psi | 45% | 1060 fps | 97.6% |
| Alliant Green Dot² | <<locked>> | 60% | 18,289 psi | 41% | 965 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,284 psi | 26% | 843 fps | 88.4% |
| Alliant POWER PISTOL* | <<locked>> | 80% | 25,730 psi | 58% | 1227 fps | 86.6% |
| Alliant RED DOT² | <<locked>> | 60% | 18,028 psi | 41% | 938 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 22,452 psi | 51% | 1112 fps | 98.2% |
| Alliant UNIQUE*² | 4.3 gr | 60% | 15,229 psi | 34% | 958 fps | 93.5% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 17,666 psi | 40% | 951 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,617 psi | 24% | 810 fps | 99.4% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 18,304 psi | 41% | 994 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 28,689 psi | 65% | 1188 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,303 psi | 39% | 869 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 30,995 psi | 70% | 1184 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 21,016 psi | 48% | 1096 fps | 88.8% |
| Hodgdon Longshot*² | <<locked>> | 60% | 23,163 psi | 52% | 1138 fps | 92.6% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 6,048 psi | 14% | 604 fps | 96.4% |
| Hodgdon Universal² | <<locked>> | 60% | 18,521 psi | 42% | 1010 fps | 99.9% |
| Lovex D036*² | <<locked>> | 60% | 25,411 psi | 57% | 1188 fps | 89.6% |
| Lovex S011² | <<locked>> | 60% | 23,395 psi | 53% | 1063 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 17,898 psi | 40% | 1010 fps | 97.7% |
| Maxam CSB 1² | <<locked>> | 60% | 14,866 psi | 34% | 915 fps | 98.4% |
| Maxam CSB 2² | <<locked>> | 60% | 14,982 psi | 34% | 951 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 17,390 psi | 39% | 961 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 18,724 psi | 42% | 971 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 20,827 psi | 47% | 971 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 21,364 psi | 48% | 1096 fps | 96% |
| Ramshot True Blue*² | <<locked>> | 60% | 24,366 psi | 55% | 1158 fps | 93.4% |
| Ramshot Zip² | <<locked>> | 60% | 29,805 psi | 67% | 1175 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 20,131 psi | 46% | 1040 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,555 psi | 13% | 587 fps | 90.5% |
| ReloadSwiss RS 20*² | 4.5 gr | 60% | 13,547 psi | 31% | 935 fps | 94.1% |
| Rottweil P 801² | <<locked>> | 60% | 23,612 psi | 53% | 1063 fps | 100% |
| Rottweil P 806* | <<locked>> | 84% | 18,869 psi | 43% | 1155 fps | 87.6% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 25,411 psi | 57% | 1188 fps | 89.6% |
| SNPE Vectan A0*² | <<locked>> | 60% | 14,837 psi | 34% | 915 fps | 92.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 18,420 psi | 42% | 984 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 17,651 psi | 40% | 974 fps | 98.5% |
| SNPE Vectan BA10² | <<locked>> | 60% | 22,931 psi | 52% | 965 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 72% | 17,260 psi | 39% | 997 fps | 86.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 17,216 psi | 39% | 978 fps | 99.2% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 20,914 psi | 47% | 1158 fps | 85.2% |
| Somchem MP200*² | <<locked>> | 60% | 17,593 psi | 40% | 1007 fps | 94.3% |
| Somchem MS200² | <<locked>> | 60% | 16,621 psi | 38% | 971 fps | 95.8% |
| Somchem S221*² | <<locked>> | 76% | 31,053 psi | 70% | 1289 fps | 86.8% |
| Vihtavuori 3N37*² | 5.6 gr | 64% | 15,258 psi | 34% | 974 fps | 85.8% |
| Vihtavuori N310² | <<locked>> | 60% | 29,791 psi | 67% | 1063 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 18,855 psi | 43% | 991 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,674 psi | 22% | 745 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 17,042 psi | 39% | 1001 fps | 99.9% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,389 psi | 35% | 951 fps | 94.1% |
| Vihtavuori N350*² | <<locked>> | 68% | 14,634 psi | 33% | 958 fps | 85.4% |
| Winchester 231² | <<locked>> | 60% | 24,903 psi | 56% | 1106 fps | 100% |
| Winchester 244² | <<locked>> | 60% | 33,576 psi | 76% | 1211 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 30,139 psi | 68% | 1266 fps | 95.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,910 psi | 34% | 932 fps | 97.5% |
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 .357 | 125gr | Hornady XTP. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,460 fps; across all powders the maximum-charge window runs from 810 fps to 1,460 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 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, ReloadSwiss RS 20 rank at the top here: for .357 SIG with the .357 | 125gr | Hornady XTP 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.