Load Specifications
Load data in caliber .357 Mag. with .357 | 170gr | Speer SP MAG GD 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, Vihtavuori 3N38 and ADI AP 100.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 72% | 36,753 psi | 84% | 1198 fps | 100% |
| Accurate No. 7*² | <<locked>> | 72% | 35,012 psi | 80% | 1329 fps | 94.7% |
| Accurate No. 9* | <<locked>> | 80% | 34,838 psi | 80% | 1322 fps | 89.3% |
| Accurate Solo 1000² | <<locked>> | 76% | 38,827 psi | 89% | 1125 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 38,392 psi | 88% | 1171 fps | 100% |
| Accurate TCM* | <<locked>> | 80% | 35,244 psi | 81% | 1322 fps | 90.8% |
| ADI AP 100 | <<locked>> | 96% | 39,334 psi | 90% | 1322 fps | 100% |
| ADI AP 70N² | <<locked>> | 64% | 36,245 psi | 83% | 1165 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 36,898 psi | 85% | 1014 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 38,130 psi | 88% | 1056 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 38,189 psi | 88% | 1089 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 38,218 psi | 88% | 1132 fps | 100% |
| Alliant BE-86² | <<locked>> | 76% | 36,274 psi | 83% | 1142 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 37,985 psi | 87% | 1358 fps | 94.8% |
| Alliant BULLSEYE² | <<locked>> | 68% | 36,042 psi | 83% | 1214 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 37,695 psi | 87% | 1129 fps | 100% |
| Alliant Herco | <<locked>> | 92% | 36,840 psi | 85% | 1227 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 76% | 35,984 psi | 83% | 1325 fps | 99.7% |
| Alliant RED DOT² | <<locked>> | 76% | 36,898 psi | 85% | 1096 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 37,362 psi | 86% | 1234 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 39,146 psi | 90% | 1253 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 38,638 psi | 89% | 1125 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 92% | 36,898 psi | 85% | 1122 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 38,928 psi | 89% | 1148 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 37,579 psi | 86% | 1047 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 37,101 psi | 85% | 1273 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,521 psi | 43% | 853 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 37,188 psi | 85% | 1175 fps | 100% |
| Lovex D037.1*² | <<locked>> | 72% | 35,012 psi | 80% | 1329 fps | 94.7% |
| Lovex D037.2* | <<locked>> | 80% | 35,621 psi | 82% | 1329 fps | 89.6% |
| Lovex S011² | <<locked>> | 64% | 37,173 psi | 85% | 1135 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 38,928 psi | 89% | 1207 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 39,131 psi | 90% | 1175 fps | 100% |
| Maxam CSB 2² | <<locked>> | 76% | 36,042 psi | 83% | 1145 fps | 100% |
| Maxam CSB 3² | <<locked>> | 76% | 36,143 psi | 83% | 1125 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 38,638 psi | 89% | 1129 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 39,262 psi | 90% | 1093 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 92% | 34,983 psi | 80% | 1355 fps | 87.7% |
| Ramshot Silhouette² | <<locked>> | 64% | 36,666 psi | 84% | 1230 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 38,276 psi | 88% | 1152 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,129 psi | 39% | 863 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 38,159 psi | 88% | 1234 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 80% | 37,681 psi | 87% | 1348 fps | 97.3% |
| Rottweil P 801² | <<locked>> | 64% | 38,072 psi | 88% | 1122 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 37,695 psi | 87% | 1355 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 35,621 psi | 82% | 1329 fps | 89.6% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 35,012 psi | 80% | 1329 fps | 94.7% |
| SNPE Vectan A0 | <<locked>> | 80% | 36,666 psi | 84% | 1188 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 72% | 36,941 psi | 85% | 1145 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 72% | 36,042 psi | 83% | 1155 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 39,160 psi | 90% | 1066 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 39,204 psi | 90% | 1276 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 38,261 psi | 88% | 1181 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 72% | 36,622 psi | 84% | 1335 fps | 100% |
| Somchem MP200² | <<locked>> | 72% | 37,231 psi | 86% | 1227 fps | 100% |
| Somchem MS200² | <<locked>> | 76% | 36,651 psi | 84% | 1198 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 38,783 psi | 89% | 1335 fps | 99.2% |
| Vihtavuori 3N37 | <<locked>> | 80% | 38,667 psi | 89% | 1286 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 92% | 36,825 psi | 85% | 1325 fps | 97.7% |
| Vihtavuori N105 | <<locked>> | 96% | 35,998 psi | 83% | 1362 fps | 99.6% |
| Vihtavuori N320² | <<locked>> | 72% | 38,101 psi | 88% | 1129 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 33,185 psi | 76% | 1014 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 37,782 psi | 87% | 1178 fps | 100% |
| Vihtavuori N340² | <<locked>> | 76% | 36,564 psi | 84% | 1198 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 37,623 psi | 86% | 1266 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 38,943 psi | 90% | 1168 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 38,159 psi | 88% | 1188 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% | 25,831 psi | 59% | 1066 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 22,466 psi | 52% | 1129 fps | 87.6% |
| Accurate No. 9*² | <<locked>> | 76% | 30,501 psi | 70% | 1260 fps | 87% |
| Accurate Solo 1000² | <<locked>> | 60% | 26,223 psi | 60% | 984 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,887 psi | 53% | 991 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 27,006 psi | 62% | 1201 fps | 86.3% |
| ADI AP 100*² | 6.1 gr | 60% | 15,098 psi | 35% | 922 fps | 90.2% |
| ADI AP 70N² | <<locked>> | 60% | 32,416 psi | 75% | 1122 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,615 psi | 63% | 912 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,614 psi | 61% | 928 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 26,368 psi | 61% | 961 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,557 psi | 63% | 1014 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 23,409 psi | 54% | 991 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 76% | 22,220 psi | 51% | 1109 fps | 86% |
| Alliant BULLSEYE² | <<locked>> | 60% | 29,414 psi | 68% | 1135 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,512 psi | 59% | 991 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,563 psi | 38% | 928 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 22,046 psi | 51% | 1102 fps | 95.2% |
| Alliant RED DOT² | <<locked>> | 60% | 25,121 psi | 58% | 958 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 32,590 psi | 75% | 1178 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 23,018 psi | 53% | 1050 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 25,353 psi | 58% | 981 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,418 psi | 38% | 863 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 27,499 psi | 63% | 1033 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,162 psi | 51% | 869 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 32,184 psi | 74% | 1214 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,528 psi | 20% | 640 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 27,238 psi | 63% | 1060 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 22,466 psi | 52% | 1129 fps | 87.6% |
| Lovex D037.2*² | <<locked>> | 76% | 31,212 psi | 72% | 1270 fps | 87.4% |
| Lovex S011² | <<locked>> | 60% | 33,025 psi | 76% | 1093 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,455 psi | 61% | 1070 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 21,176 psi | 49% | 961 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,641 psi | 54% | 997 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 24,410 psi | 56% | 988 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 26,107 psi | 60% | 991 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,863 psi | 66% | 981 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 88% | 30,632 psi | 70% | 1296 fps | 85.4% |
| Ramshot Silhouette² | <<locked>> | 60% | 32,372 psi | 74% | 1181 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 30,458 psi | 70% | 1070 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,818 psi | 18% | 636 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 21,306 psi | 49% | 1024 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 19,667 psi | 45% | 1056 fps | 87.7% |
| Rottweil P 801² | <<locked>> | 60% | 34,156 psi | 79% | 1083 fps | 100% |
| Rottweil P 806² | <<locked>> | 60% | 16,317 psi | 38% | 1020 fps | 96.4% |
| Shooters World Heavy Pistol*² | <<locked>> | 76% | 31,212 psi | 72% | 1270 fps | 87.4% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 22,466 psi | 52% | 1129 fps | 87.6% |
| SNPE Vectan A0² | <<locked>> | 60% | 21,611 psi | 50% | 994 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 26,107 psi | 60% | 1020 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 25,309 psi | 58% | 1027 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,312 psi | 67% | 961 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 18,391 psi | 42% | 978 fps | 97.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 25,092 psi | 58% | 1027 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 24,236 psi | 56% | 1155 fps | 97.9% |
| Somchem MP200² | <<locked>> | 60% | 26,353 psi | 61% | 1093 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 24,076 psi | 55% | 1040 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 29,008 psi | 67% | 1204 fps | 96.7% |
| Vihtavuori 3N37² | <<locked>> | 60% | 21,132 psi | 49% | 1050 fps | 99.5% |
| Vihtavuori 3N38*² | 7.5 gr | 64% | 16,143 psi | 37% | 971 fps | 85.1% |
| Vihtavuori N105*² | 7.4 gr | 64% | 13,184 psi | 30% | 938 fps | 85.2% |
| Vihtavuori N320² | <<locked>> | 60% | 27,891 psi | 64% | 1020 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,011 psi | 32% | 761 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 27,180 psi | 62% | 1063 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 23,641 psi | 54% | 1040 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 18,231 psi | 42% | 991 fps | 98.7% |
| Winchester 231² | <<locked>> | 60% | 34,998 psi | 80% | 1132 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 22,118 psi | 51% | 994 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 | 170gr | Speer SP MAG GD. Vihtavuori N105 delivers the highest muzzle velocity at 1,362 fps; across all powders the maximum-charge window runs from 853 fps to 1,362 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 26 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 39–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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, Vihtavuori 3N38, ADI AP 100 rank at the top here: for .357 Mag. with the .357 | 170gr | Speer SP MAG GD 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.