Load Specifications
Load data in caliber .357 Mag. with .357 | 158gr | Speer JHP bullet and 67 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N105, ADI AP 100 and SNPE Vectan BA7 1/2.
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% | 36,695 psi | 84% | 1257 fps | 100% |
| Accurate No. 7*² | <<locked>> | 72% | 34,113 psi | 78% | 1375 fps | 93.5% |
| Accurate No. 9* | <<locked>> | 84% | 39,030 psi | 90% | 1430 fps | 90% |
| Accurate Solo 1000² | <<locked>> | 76% | 38,145 psi | 88% | 1175 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 38,319 psi | 88% | 1230 fps | 100% |
| Accurate TCM* | <<locked>> | 84% | 38,798 psi | 89% | 1424 fps | 91.2% |
| ADI AP 100 | <<locked>> | 96% | 38,189 psi | 88% | 1371 fps | 99.8% |
| ADI AP 70N² | <<locked>> | 64% | 35,288 psi | 81% | 1211 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,943 psi | 90% | 1086 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,753 psi | 87% | 1106 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 37,710 psi | 87% | 1142 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 37,521 psi | 86% | 1181 fps | 100% |
| Alliant BE-86² | <<locked>> | 76% | 35,955 psi | 83% | 1198 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 37,086 psi | 85% | 1404 fps | 93.5% |
| Alliant BULLSEYE² | <<locked>> | 68% | 36,071 psi | 83% | 1276 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,970 psi | 85% | 1181 fps | 100% |
| Alliant Herco | <<locked>> | 92% | 36,187 psi | 83% | 1280 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 39,320 psi | 90% | 1430 fps | 99.8% |
| Alliant RED DOT² | <<locked>> | 76% | 36,434 psi | 84% | 1148 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 36,332 psi | 84% | 1283 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,782 psi | 87% | 1302 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,681 psi | 87% | 1171 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 39,175 psi | 90% | 1201 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 38,159 psi | 88% | 1198 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 37,115 psi | 85% | 1096 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 36,129 psi | 83% | 1322 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,738 psi | 41% | 886 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 36,201 psi | 83% | 1224 fps | 100% |
| Lovex D037.1*² | <<locked>> | 72% | 34,113 psi | 78% | 1375 fps | 93.5% |
| Lovex D037.2* | <<locked>> | 80% | 34,345 psi | 79% | 1371 fps | 87.9% |
| Lovex S011² | <<locked>> | 64% | 36,361 psi | 84% | 1184 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 37,550 psi | 86% | 1257 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 38,914 psi | 89% | 1230 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 38,856 psi | 89% | 1230 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 39,262 psi | 90% | 1214 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,898 psi | 87% | 1181 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 38,711 psi | 89% | 1142 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 96% | 38,812 psi | 89% | 1463 fps | 88.3% |
| Ramshot Silhouette² | <<locked>> | 64% | 36,071 psi | 83% | 1283 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,202 psi | 86% | 1198 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,404 psi | 38% | 896 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 37,565 psi | 86% | 1289 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 80% | 36,230 psi | 83% | 1391 fps | 96.2% |
| Rottweil P 801² | <<locked>> | 64% | 37,173 psi | 85% | 1168 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 36,303 psi | 83% | 1404 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 34,345 psi | 79% | 1371 fps | 87.9% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 34,113 psi | 78% | 1375 fps | 93.5% |
| SNPE Vectan A0 | <<locked>> | 84% | 39,073 psi | 90% | 1270 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 72% | 35,839 psi | 82% | 1191 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 38,522 psi | 89% | 1237 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,754 psi | 89% | 1115 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 38,218 psi | 88% | 1325 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 38,101 psi | 88% | 1237 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 72% | 35,433 psi | 81% | 1381 fps | 99.9% |
| Somchem MP200² | <<locked>> | 72% | 36,796 psi | 85% | 1283 fps | 100% |
| Somchem MS200² | <<locked>> | 76% | 36,448 psi | 84% | 1253 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 37,376 psi | 86% | 1381 fps | 98.5% |
| Vihtavuori 3N37 | <<locked>> | 80% | 37,623 psi | 86% | 1335 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 92% | 35,259 psi | 81% | 1365 fps | 96.5% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 38,653 psi | 89% | 1453 fps | 99.6% |
| Vihtavuori N320² | <<locked>> | 72% | 37,304 psi | 86% | 1175 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,343 psi | 74% | 1060 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 37,579 psi | 86% | 1237 fps | 100% |
| Vihtavuori N340² | <<locked>> | 76% | 36,216 psi | 83% | 1253 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 36,680 psi | 84% | 1319 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 38,841 psi | 89% | 1227 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 37,565 psi | 86% | 1243 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 25,251 psi | 58% | 1112 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 21,669 psi | 50% | 1161 fps | 85.7% |
| Accurate No. 9*² | <<locked>> | 76% | 29,602 psi | 68% | 1299 fps | 85.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 26,078 psi | 60% | 1033 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,553 psi | 52% | 1037 fps | 100% |
| Accurate TCM*² | <<locked>> | 76% | 29,414 psi | 68% | 1293 fps | 86.6% |
| ADI AP 100*² | 6.3 gr | 60% | 14,707 psi | 34% | 951 fps | 88.5% |
| ADI AP 70N² | <<locked>> | 60% | 31,691 psi | 73% | 1171 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,847 psi | 64% | 961 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,643 psi | 61% | 978 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,469 psi | 59% | 997 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,296 psi | 63% | 1063 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,872 psi | 53% | 1033 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 24,120 psi | 55% | 1198 fps | 86.4% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,834 psi | 66% | 1184 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,338 psi | 58% | 1037 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,273 psi | 37% | 968 fps | 99.9% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,277 psi | 49% | 1135 fps | 93.8% |
| Alliant RED DOT² | <<locked>> | 60% | 24,279 psi | 56% | 997 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,807 psi | 73% | 1227 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,539 psi | 52% | 1093 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 25,034 psi | 58% | 1027 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,157 psi | 37% | 902 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,542 psi | 61% | 1073 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,321 psi | 51% | 915 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 31,488 psi | 72% | 1260 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,340 psi | 19% | 669 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,731 psi | 61% | 1106 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 21,669 psi | 50% | 1161 fps | 85.7% |
| Lovex D037.2*² | <<locked>> | 76% | 30,269 psi | 70% | 1309 fps | 85.6% |
| Lovex S011² | <<locked>> | 60% | 32,430 psi | 75% | 1142 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,585 psi | 61% | 1125 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,914 psi | 48% | 1004 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,206 psi | 53% | 1043 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 24,178 psi | 56% | 1033 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,889 psi | 60% | 1040 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,761 psi | 66% | 1030 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 92% | 34,011 psi | 78% | 1401 fps | 86% |
| Ramshot Silhouette² | <<locked>> | 60% | 31,169 psi | 72% | 1224 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,820 psi | 69% | 1115 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,658 psi | 18% | 663 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,769 psi | 48% | 1066 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 19,261 psi | 44% | 1093 fps | 86.1% |
| Rottweil P 801² | <<locked>> | 60% | 33,417 psi | 77% | 1129 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 15,708 psi | 36% | 1050 fps | 94.9% |
| Shooters World Heavy Pistol*² | <<locked>> | 76% | 30,269 psi | 70% | 1309 fps | 85.6% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 21,669 psi | 50% | 1161 fps | 85.7% |
| SNPE Vectan A0² | <<locked>> | 60% | 21,205 psi | 49% | 1037 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,585 psi | 59% | 1066 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,772 psi | 57% | 1070 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,254 psi | 67% | 1010 fps | 100% |
| SNPE Vectan BA7 1/2² | 6.7 gr | 60% | 17,869 psi | 41% | 1010 fps | 96.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,656 psi | 57% | 1073 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 23,728 psi | 55% | 1198 fps | 97% |
| Somchem MP200² | <<locked>> | 60% | 25,599 psi | 59% | 1135 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,627 psi | 54% | 1086 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 28,210 psi | 65% | 1247 fps | 95.6% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,392 psi | 47% | 1083 fps | 98.8% |
| Vihtavuori 3N38*² | <<locked>> | 68% | 17,579 psi | 40% | 1050 fps | 85.5% |
| Vihtavuori N105*² | 8.1 gr | 68% | 14,417 psi | 33% | 1017 fps | 85.9% |
| Vihtavuori N320² | <<locked>> | 60% | 27,514 psi | 63% | 1066 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,054 psi | 32% | 801 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 26,527 psi | 61% | 1109 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 23,090 psi | 53% | 1083 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 17,651 psi | 41% | 1024 fps | 97.8% |
| Winchester 231² | <<locked>> | 60% | 34,127 psi | 78% | 1178 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,611 psi | 50% | 1037 fps | 100% |
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 67 powders for .357 Mag. loaded with the .357 | 158gr | Speer JHP. 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. Vihtavuori N105, ADI AP 100, SNPE Vectan BA7 1/2 rank at the top here: for .357 Mag. with the .357 | 158gr | Speer JHP they combine a high case fill with complete burn and sit in the upper velocity band. 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.