Load Specifications
Load data in caliber .357 Mag. with .357 | 158gr | Sierra JSP FN bullet and 67 powders. The key underlying parameters are shown in the table above.
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: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 72% | 36,564 psi | 84% | 1253 fps | 100% |
| Accurate No. 7*² | <<locked>> | 72% | 33,982 psi | 78% | 1375 fps | 93.4% |
| Accurate No. 9* | <<locked>> | 84% | 38,899 psi | 89% | 1430 fps | 90% |
| Accurate Solo 1000² | <<locked>> | 76% | 38,043 psi | 87% | 1175 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 38,218 psi | 88% | 1230 fps | 100% |
| Accurate TCM* | <<locked>> | 84% | 38,682 psi | 89% | 1424 fps | 91.2% |
| ADI AP 100 | <<locked>> | 96% | 38,101 psi | 88% | 1368 fps | 99.8% |
| ADI AP 70N² | <<locked>> | 64% | 35,215 psi | 81% | 1211 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,899 psi | 89% | 1086 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,681 psi | 87% | 1106 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 37,623 psi | 86% | 1142 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 37,420 psi | 86% | 1181 fps | 100% |
| Alliant BE-86² | <<locked>> | 76% | 35,868 psi | 82% | 1198 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 36,999 psi | 85% | 1404 fps | 93.5% |
| Alliant BULLSEYE² | <<locked>> | 68% | 36,042 psi | 83% | 1276 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 37,898 psi | 87% | 1191 fps | 100% |
| Alliant Herco | <<locked>> | 92% | 36,114 psi | 83% | 1280 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 39,276 psi | 90% | 1427 fps | 99.7% |
| Alliant RED DOT² | <<locked>> | 76% | 36,347 psi | 84% | 1145 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 36,230 psi | 83% | 1283 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 38,667 psi | 89% | 1312 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,637 psi | 87% | 1171 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 39,117 psi | 90% | 1201 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 38,072 psi | 88% | 1198 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 37,086 psi | 85% | 1096 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 36,085 psi | 83% | 1322 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,709 psi | 41% | 886 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 36,172 psi | 83% | 1224 fps | 100% |
| Lovex D037.1*² | <<locked>> | 72% | 33,982 psi | 78% | 1375 fps | 93.4% |
| Lovex D037.2* | <<locked>> | 80% | 35,012 psi | 80% | 1381 fps | 88.2% |
| Lovex S011² | <<locked>> | 64% | 36,260 psi | 83% | 1184 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 37,507 psi | 86% | 1253 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 38,812 psi | 89% | 1230 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 38,783 psi | 89% | 1230 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 39,204 psi | 90% | 1214 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,797 psi | 87% | 1178 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 38,667 psi | 89% | 1142 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 96% | 38,667 psi | 89% | 1463 fps | 88.2% |
| Ramshot Silhouette² | <<locked>> | 64% | 36,042 psi | 83% | 1283 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,159 psi | 85% | 1198 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,360 psi | 38% | 892 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 37,492 psi | 86% | 1289 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 80% | 36,100 psi | 83% | 1388 fps | 96.2% |
| Rottweil P 801² | <<locked>> | 64% | 37,101 psi | 85% | 1168 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 36,245 psi | 83% | 1401 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 35,012 psi | 80% | 1381 fps | 88.2% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 33,982 psi | 78% | 1375 fps | 93.4% |
| SNPE Vectan A0 | <<locked>> | 84% | 38,972 psi | 90% | 1270 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 39,349 psi | 90% | 1227 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 38,450 psi | 88% | 1237 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,667 psi | 89% | 1115 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 38,101 psi | 88% | 1325 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 38,029 psi | 87% | 1237 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 72% | 35,346 psi | 81% | 1381 fps | 99.9% |
| Somchem MP200² | <<locked>> | 72% | 36,680 psi | 84% | 1283 fps | 100% |
| Somchem MS200² | <<locked>> | 76% | 36,347 psi | 84% | 1253 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 37,289 psi | 86% | 1378 fps | 98.4% |
| Vihtavuori 3N37 | <<locked>> | 80% | 37,536 psi | 86% | 1335 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 96% | 39,305 psi | 90% | 1417 fps | 97.7% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 38,537 psi | 89% | 1453 fps | 99.6% |
| Vihtavuori N320² | <<locked>> | 72% | 38,290 psi | 88% | 1188 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 33,127 psi | 76% | 1066 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 37,478 psi | 86% | 1234 fps | 100% |
| Vihtavuori N340² | <<locked>> | 76% | 36,143 psi | 83% | 1253 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 36,593 psi | 84% | 1319 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 38,740 psi | 89% | 1227 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 37,492 psi | 86% | 1240 fps | 100% |
Start Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 25,222 psi | 58% | 1112 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 22,162 psi | 51% | 1171 fps | 86.2% |
| Accurate No. 9*² | <<locked>> | 76% | 29,515 psi | 68% | 1299 fps | 85.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 26,034 psi | 60% | 1033 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,495 psi | 52% | 1037 fps | 100% |
| Accurate TCM*² | <<locked>> | 76% | 29,950 psi | 69% | 1299 fps | 87% |
| ADI AP 100*² | <<locked>> | 60% | 14,678 psi | 34% | 951 fps | 88.5% |
| ADI AP 70N² | <<locked>> | 60% | 31,633 psi | 73% | 1171 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,804 psi | 64% | 961 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,585 psi | 61% | 978 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,454 psi | 59% | 997 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,267 psi | 63% | 1063 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,843 psi | 53% | 1033 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 24,062 psi | 55% | 1194 fps | 86.4% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,761 psi | 66% | 1181 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,295 psi | 58% | 1037 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,244 psi | 37% | 965 fps | 99.9% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,828 psi | 50% | 1148 fps | 94.2% |
| Alliant RED DOT² | <<locked>> | 60% | 25,092 psi | 58% | 1007 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 32,576 psi | 75% | 1237 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,524 psi | 52% | 1093 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,961 psi | 57% | 1027 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,143 psi | 37% | 902 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 27,151 psi | 62% | 1079 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,278 psi | 51% | 919 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 31,415 psi | 72% | 1260 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,340 psi | 19% | 669 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,658 psi | 61% | 1106 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 22,162 psi | 51% | 1171 fps | 86.2% |
| Lovex D037.2*² | <<locked>> | 76% | 30,139 psi | 69% | 1306 fps | 85.6% |
| Lovex S011² | <<locked>> | 60% | 32,343 psi | 74% | 1142 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,556 psi | 61% | 1125 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,842 psi | 48% | 1004 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,134 psi | 53% | 1043 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 24,105 psi | 55% | 1033 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,846 psi | 59% | 1040 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,703 psi | 66% | 1030 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 92% | 33,939 psi | 78% | 1398 fps | 85.9% |
| Ramshot Silhouette² | <<locked>> | 60% | 31,894 psi | 73% | 1234 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,733 psi | 68% | 1115 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,644 psi | 18% | 663 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,697 psi | 48% | 1066 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 19,247 psi | 44% | 1093 fps | 86.1% |
| Rottweil P 801² | <<locked>> | 60% | 33,388 psi | 77% | 1129 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 15,679 psi | 36% | 1050 fps | 94.9% |
| Shooters World Heavy Pistol*² | <<locked>> | 76% | 30,139 psi | 69% | 1306 fps | 85.6% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 22,162 psi | 51% | 1171 fps | 86.2% |
| SNPE Vectan A0² | <<locked>> | 60% | 21,176 psi | 49% | 1037 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,512 psi | 59% | 1066 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,729 psi | 57% | 1070 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,196 psi | 67% | 1010 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 17,840 psi | 41% | 1010 fps | 96.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,613 psi | 57% | 1073 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 23,714 psi | 55% | 1198 fps | 97% |
| Somchem MP200² | <<locked>> | 60% | 25,541 psi | 59% | 1135 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,554 psi | 54% | 1083 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 28,137 psi | 65% | 1247 fps | 95.6% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,958 psi | 48% | 1096 fps | 99% |
| Vihtavuori 3N38*² | <<locked>> | 68% | 17,550 psi | 40% | 1050 fps | 85.5% |
| Vihtavuori N105*² | <<locked>> | 68% | 14,402 psi | 33% | 1014 fps | 85.8% |
| Vihtavuori N320² | <<locked>> | 60% | 27,499 psi | 63% | 1066 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,040 psi | 32% | 801 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 26,498 psi | 61% | 1109 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 23,032 psi | 53% | 1083 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 18,173 psi | 42% | 1037 fps | 98.1% |
| Winchester 231² | <<locked>> | 60% | 34,069 psi | 78% | 1178 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,538 psi | 50% | 1033 fps | 100% |
* 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 67 powders for .357 Mag. loaded with the .357 | 158gr | Sierra JSP FN. Ramshot Enforcer delivers the highest muzzle velocity at 1,463 fps; across all powders the maximum-charge window runs from 886 fps to 1,463 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 29 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 38–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N105 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. As outliers, Accurate No. 7, Accurate No. 9, Accurate TCM 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.