Load Specifications
Load data in caliber .357 Auto Mag. with .357 | 135gr | Speer HPSB GD bullet and 42 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N32C Tin Star, ReloadSwiss RS 14 and Hodgdon TrailBoss.
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: 6.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 9*² | <<locked>> | 68% | 30,037 psi | 81% | 1601 fps | 88.5% |
| Accurate Solo 1000² | <<locked>> | 64% | 32,677 psi | 88% | 1381 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 33,214 psi | 90% | 1447 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 30,110 psi | 81% | 1594 fps | 89.9% |
| ADI AP 100 | <<locked>> | 80% | 32,155 psi | 87% | 1585 fps | 99.8% |
| ADI APS 350² | <<locked>> | 64% | 33,185 psi | 90% | 1283 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 32,184 psi | 87% | 1302 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 32,140 psi | 87% | 1339 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 31,299 psi | 85% | 1404 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 31,401 psi | 85% | 1621 fps | 93.4% |
| Alliant Green Dot² | <<locked>> | 64% | 32,648 psi | 88% | 1398 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 33,315 psi | 90% | 1526 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 64% | 30,879 psi | 83% | 1604 fps | 99.3% |
| Alliant RED DOT² | <<locked>> | 64% | 31,183 psi | 84% | 1345 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 64% | 30,719 psi | 83% | 1490 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 32,300 psi | 87% | 1381 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 32,300 psi | 87% | 1388 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 32,619 psi | 88% | 1306 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 21,321 psi | 58% | 1158 fps | 100% |
| Lovex D037.2*² | <<locked>> | 68% | 30,806 psi | 83% | 1614 fps | 88.9% |
| Maxam CSB 1² | <<locked>> | 68% | 31,546 psi | 85% | 1417 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 31,299 psi | 85% | 1407 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 31,386 psi | 85% | 1391 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 33,040 psi | 89% | 1391 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 80% | 32,532 psi | 88% | 1680 fps | 88.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 20,146 psi | 54% | 1175 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 33,417 psi | 90% | 1519 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 68% | 32,619 psi | 88% | 1640 fps | 96.8% |
| Rottweil P 806² | <<locked>> | 68% | 29,486 psi | 80% | 1575 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 30,806 psi | 83% | 1614 fps | 88.9% |
| SNPE Vectan A0² | <<locked>> | 68% | 31,560 psi | 85% | 1460 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 33,417 psi | 90% | 1457 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 31,241 psi | 84% | 1522 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 32,808 psi | 89% | 1450 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 31,285 psi | 85% | 1467 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 64% | 29,588 psi | 80% | 1512 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 33,228 psi | 90% | 1637 fps | 97.6% |
| Vihtavuori N105 | <<locked>> | 80% | 29,950 psi | 81% | 1624 fps | 99% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 33,141 psi | 90% | 1319 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 31,589 psi | 85% | 1473 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 32,750 psi | 89% | 1558 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 33,170 psi | 90% | 1463 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 9*² | <<locked>> | 64% | 25,817 psi | 70% | 1509 fps | 85.5% |
| Accurate Solo 1000² | <<locked>> | 60% | 29,791 psi | 81% | 1339 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 26,571 psi | 72% | 1345 fps | 100% |
| Accurate TCM*² | <<locked>> | 64% | 26,266 psi | 71% | 1512 fps | 87.3% |
| ADI AP 100*² | <<locked>> | 60% | 18,260 psi | 49% | 1276 fps | 94.2% |
| ADI APS 350² | <<locked>> | 60% | 30,124 psi | 81% | 1237 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,370 psi | 79% | 1260 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 29,225 psi | 79% | 1296 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 27,862 psi | 75% | 1352 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 68% | 22,365 psi | 60% | 1417 fps | 87.4% |
| Alliant Green Dot² | <<locked>> | 60% | 29,225 psi | 79% | 1345 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 20,117 psi | 54% | 1280 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 27,180 psi | 73% | 1526 fps | 98.3% |
| Alliant RED DOT² | <<locked>> | 60% | 28,268 psi | 76% | 1299 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 27,209 psi | 74% | 1427 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,877 psi | 78% | 1329 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 19,479 psi | 53% | 1175 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,584 psi | 66% | 1178 fps | 100% |
| Hodgdon TrailBoss² | 5.1 gr | 60% | 9,863 psi | 27% | 873 fps | 100% |
| Lovex D037.2*² | <<locked>> | 64% | 26,542 psi | 72% | 1526 fps | 86.1% |
| Maxam CSB 1² | <<locked>> | 60% | 25,396 psi | 69% | 1319 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 28,065 psi | 76% | 1358 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 28,094 psi | 76% | 1339 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 29,573 psi | 80% | 1342 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 76% | 28,413 psi | 77% | 1594 fps | 85.5% |
| ReloadSwiss RS 14² | 5.2 gr | 60% | 9,326 psi | 25% | 879 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 26,107 psi | 71% | 1401 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 25,005 psi | 68% | 1483 fps | 93% |
| Rottweil P 806² | <<locked>> | 60% | 22,191 psi | 60% | 1427 fps | 99.5% |
| Shooters World Heavy Pistol*² | <<locked>> | 64% | 26,542 psi | 72% | 1526 fps | 86.1% |
| SNPE Vectan A0² | <<locked>> | 60% | 25,237 psi | 68% | 1355 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 29,776 psi | 81% | 1401 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 22,104 psi | 60% | 1345 fps | 99.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 29,588 psi | 80% | 1401 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 28,224 psi | 76% | 1414 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 26,005 psi | 70% | 1444 fps | 100% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 17,869 psi | 48% | 1289 fps | 88.1% |
| Vihtavuori N105*² | <<locked>> | 60% | 14,968 psi | 40% | 1250 fps | 88.8% |
| Vihtavuori N32C Tin Star² | 6.9 gr | 60% | 16,592 psi | 45% | 1040 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 27,920 psi | 75% | 1414 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 22,960 psi | 62% | 1378 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 26,614 psi | 72% | 1362 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 42 powders for .357 Auto Mag. loaded with the .357 | 135gr | Speer HPSB GD. Ramshot Enforcer delivers the highest muzzle velocity at 1,680 fps; across all powders the maximum-charge window runs from 1,158 fps to 1,680 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 10 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14 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 N32C Tin Star, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .357 Auto Mag. with the .357 | 135gr | Speer HPSB GD they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 9, Accurate TCM, Alliant BLUE DOT burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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.