Load Specifications
Load data in caliber .357 SIG with .357 | 125gr | X-TREME X-DEF HP bullet and 65 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% | 37,608 psi | 85% | 1286 fps | 99.9% |
| Accurate No. 5*² | <<locked>> | 68% | 35,215 psi | 80% | 1335 fps | 94.5% |
| Accurate Solo 1000 | <<locked>> | 88% | 38,914 psi | 88% | 1220 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 92% | 37,275 psi | 84% | 1263 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 29,457 psi | 67% | 1243 fps | 89.8% |
| ADI AP 70N² | <<locked>> | 76% | 36,883 psi | 83% | 1273 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 39,465 psi | 89% | 1115 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 37,768 psi | 85% | 1135 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 39,334 psi | 89% | 1194 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 39,320 psi | 89% | 1243 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 39,755 psi | 90% | 1280 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 39,914 psi | 90% | 1358 fps | 100% |
| Alliant Green Dot | <<locked>> | 88% | 38,667 psi | 87% | 1240 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 31,589 psi | 71% | 1257 fps | 100% |
| Alliant POWER PISTOL* | <<locked>> | 92% | 36,680 psi | 83% | 1398 fps | 92.6% |
| Alliant RED DOT | <<locked>> | 92% | 39,871 psi | 90% | 1224 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 38,189 psi | 86% | 1342 fps | 100% |
| Alliant UNIQUE | <<locked>> | 92% | 36,999 psi | 84% | 1332 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 39,073 psi | 88% | 1227 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 31,140 psi | 70% | 1161 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 39,262 psi | 89% | 1257 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 39,160 psi | 89% | 1306 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 38,551 psi | 87% | 1142 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 37,260 psi | 84% | 1247 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 38,145 psi | 86% | 1358 fps | 97.2% |
| Hodgdon Longshot² | <<locked>> | 72% | 37,391 psi | 85% | 1348 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 14,707 psi | 33% | 850 fps | 100% |
| Hodgdon Universal | <<locked>> | 84% | 36,883 psi | 83% | 1273 fps | 100% |
| Lovex D036*² | <<locked>> | 68% | 35,157 psi | 79% | 1335 fps | 94.5% |
| Lovex S011² | <<locked>> | 76% | 38,348 psi | 87% | 1243 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 37,971 psi | 86% | 1299 fps | 100% |
| Maxam CSB 1 | <<locked>> | 96% | 37,231 psi | 84% | 1260 fps | 100% |
| Maxam CSB 2 | <<locked>> | 92% | 36,927 psi | 83% | 1266 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 39,175 psi | 89% | 1260 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 38,276 psi | 87% | 1227 fps | 100% |
| Maxam CSB 5 | <<locked>> | 80% | 36,027 psi | 81% | 1152 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 37,492 psi | 85% | 1335 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 39,073 psi | 88% | 1365 fps | 98.6% |
| Ramshot Zip² | <<locked>> | 64% | 35,911 psi | 81% | 1240 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 80% | 38,319 psi | 87% | 1263 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 13,343 psi | 30% | 840 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 38,682 psi | 87% | 1355 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 39,088 psi | 88% | 1234 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 35,447 psi | 80% | 1427 fps | 97.1% |
| Shooters World Auto Pistol*² | <<locked>> | 68% | 35,157 psi | 79% | 1335 fps | 94.5% |
| SNPE Vectan A0 | <<locked>> | 96% | 38,392 psi | 87% | 1302 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 84% | 37,014 psi | 84% | 1243 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 39,160 psi | 89% | 1283 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 39,044 psi | 88% | 1148 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 36,854 psi | 83% | 1325 fps | 97.6% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 37,463 psi | 85% | 1273 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 88% | 37,405 psi | 85% | 1424 fps | 94.8% |
| Somchem MP200 | <<locked>> | 84% | 36,782 psi | 83% | 1316 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 39,291 psi | 89% | 1325 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 38,145 psi | 86% | 1381 fps | 90.2% |
| Vihtavuori 3N37 | <<locked>> | 92% | 35,969 psi | 81% | 1339 fps | 98.3% |
| Vihtavuori N310² | <<locked>> | 68% | 38,392 psi | 87% | 1142 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 38,609 psi | 87% | 1237 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 25,628 psi | 58% | 1020 fps | 100% |
| Vihtavuori N330 | <<locked>> | 84% | 36,912 psi | 83% | 1280 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 39,334 psi | 89% | 1325 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 37,797 psi | 85% | 1358 fps | 98.8% |
| Winchester 231² | <<locked>> | 72% | 37,086 psi | 84% | 1253 fps | 100% |
| Winchester 572² | <<locked>> | 64% | 37,217 psi | 84% | 1355 fps | 97.8% |
| Winchester AutoComp | <<locked>> | 96% | 39,798 psi | 90% | 1309 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% | 18,637 psi | 42% | 991 fps | 93.8% |
| Accurate No. 5*² | <<locked>> | 60% | 27,180 psi | 61% | 1207 fps | 90.7% |
| Accurate Solo 1000² | <<locked>> | 60% | 20,595 psi | 47% | 978 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 17,071 psi | 39% | 955 fps | 99.3% |
| ADI AP 100* | <<locked>> | 88% | 22,669 psi | 51% | 1119 fps | 85.1% |
| ADI AP 70N² | <<locked>> | 60% | 24,772 psi | 56% | 1109 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 23,351 psi | 53% | 925 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 22,089 psi | 50% | 938 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 21,451 psi | 48% | 965 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 22,075 psi | 50% | 1014 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 17,448 psi | 39% | 965 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 60% | 21,393 psi | 48% | 1076 fps | 98.3% |
| Alliant Green Dot² | <<locked>> | 60% | 20,088 psi | 45% | 981 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 13,213 psi | 30% | 876 fps | 91.3% |
| Alliant POWER PISTOL*² | <<locked>> | 76% | 24,482 psi | 55% | 1188 fps | 85.6% |
| Alliant RED DOT² | <<locked>> | 60% | 19,856 psi | 45% | 955 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 23,989 psi | 54% | 1129 fps | 98.7% |
| Alliant UNIQUE² | 4.3 gr | 60% | 17,245 psi | 39% | 988 fps | 95.3% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 19,377 psi | 44% | 965 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 12,517 psi | 28% | 837 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 20,262 psi | 46% | 1010 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 30,806 psi | 70% | 1204 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 18,492 psi | 42% | 879 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 32,692 psi | 74% | 1194 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 22,814 psi | 52% | 1119 fps | 90.2% |
| Hodgdon Longshot*² | <<locked>> | 60% | 25,019 psi | 57% | 1161 fps | 93.7% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,832 psi | 18% | 636 fps | 99.1% |
| Hodgdon Universal² | <<locked>> | 60% | 20,639 psi | 47% | 1033 fps | 100% |
| Lovex D036*² | <<locked>> | 60% | 27,122 psi | 61% | 1207 fps | 90.6% |
| Lovex S011² | <<locked>> | 60% | 24,729 psi | 56% | 1073 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 19,885 psi | 45% | 1033 fps | 98.6% |
| Maxam CSB 1² | <<locked>> | 60% | 16,549 psi | 37% | 938 fps | 99.2% |
| Maxam CSB 2² | <<locked>> | 60% | 17,289 psi | 39% | 978 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 18,985 psi | 43% | 978 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 20,320 psi | 46% | 984 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 22,437 psi | 51% | 981 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 23,032 psi | 52% | 1115 fps | 96.9% |
| Ramshot True Blue*² | <<locked>> | 60% | 26,194 psi | 59% | 1175 fps | 94.4% |
| Ramshot Zip² | <<locked>> | 60% | 31,560 psi | 71% | 1188 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 22,742 psi | 51% | 1063 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,426 psi | 17% | 627 fps | 95.6% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 15,258 psi | 34% | 965 fps | 95.9% |
| Rottweil P 801² | <<locked>> | 60% | 26,107 psi | 59% | 1079 fps | 100% |
| Rottweil P 806*² | <<locked>> | 76% | 17,114 psi | 39% | 1096 fps | 85.7% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 27,122 psi | 61% | 1207 fps | 90.6% |
| SNPE Vectan A0*² | <<locked>> | 60% | 16,331 psi | 37% | 935 fps | 94.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 19,928 psi | 45% | 997 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 19,087 psi | 43% | 991 fps | 99.1% |
| SNPE Vectan BA10² | <<locked>> | 60% | 24,033 psi | 54% | 968 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 17,274 psi | 39% | 981 fps | 86.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 18,956 psi | 43% | 994 fps | 99.7% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 23,322 psi | 53% | 1191 fps | 87.2% |
| Somchem MP200² | 4.9 gr | 60% | 19,435 psi | 44% | 1030 fps | 95.6% |
| Somchem MS200² | <<locked>> | 60% | 18,362 psi | 42% | 994 fps | 97% |
| Somchem S221*² | <<locked>> | 72% | 30,139 psi | 68% | 1263 fps | 86.2% |
| Vihtavuori 3N37*² | 5.2 gr | 60% | 15,011 psi | 34% | 948 fps | 85.5% |
| Vihtavuori N310² | <<locked>> | 60% | 31,546 psi | 71% | 1070 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 20,784 psi | 47% | 1007 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 11,763 psi | 27% | 768 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 19,043 psi | 43% | 1024 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 17,172 psi | 39% | 974 fps | 95.6% |
| Vihtavuori N350*² | <<locked>> | 64% | 14,765 psi | 33% | 942 fps | 85.6% |
| Winchester 231² | <<locked>> | 60% | 26,614 psi | 60% | 1119 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 32,024 psi | 72% | 1283 fps | 96.3% |
| Winchester AutoComp ² | <<locked>> | 60% | 16,868 psi | 38% | 958 fps | 98.6% |
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 65 powders for .357 SIG loaded with the .357 | 125gr | X-TREME X-DEF HP. Rottweil P 806 delivers the highest muzzle velocity at 1,427 fps; across all powders the maximum-charge window runs from 840 fps to 1,427 fps. ADI AP 100 gives the best case fill at 100 %, and 48 of the 65 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 30–90 %, 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 .357 | 125gr | X-TREME X-DEF HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 5, ADI AP 100, Alliant POWER PISTOL 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.