Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 124gr | LEE Mold 356-124-2R bullet and 50 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. 2² | <<locked>> | 64% | 31,546 psi | 85% | 1555 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 30,298 psi | 82% | 1683 fps | 92.5% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,082 psi | 84% | 1430 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,024 psi | 84% | 1493 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 30,676 psi | 83% | 1680 fps | 88.6% |
| ADI AP 100 | <<locked>> | 84% | 32,460 psi | 88% | 1667 fps | 99.4% |
| ADI APS 350² | <<locked>> | 64% | 32,169 psi | 87% | 1335 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,111 psi | 84% | 1352 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 33,359 psi | 90% | 1434 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 32,735 psi | 89% | 1473 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,126 psi | 87% | 1493 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 31,314 psi | 85% | 1693 fps | 91.9% |
| Alliant Green Dot² | <<locked>> | 64% | 29,965 psi | 81% | 1434 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 30,589 psi | 83% | 1562 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 31,575 psi | 85% | 1696 fps | 98.8% |
| Alliant RED DOT² | <<locked>> | 68% | 32,285 psi | 87% | 1437 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 31,285 psi | 85% | 1581 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,284 psi | 82% | 1427 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 32,605 psi | 88% | 1470 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 33,417 psi | 90% | 1486 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 30,893 psi | 84% | 1348 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,913 psi | 51% | 1181 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 32,285 psi | 87% | 1529 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 30,298 psi | 82% | 1683 fps | 92.5% |
| Lovex S020² | <<locked>> | 64% | 32,938 psi | 89% | 1562 fps | 100% |
| Maxam CSB 1² | <<locked>> | 72% | 32,126 psi | 87% | 1506 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 31,894 psi | 86% | 1499 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 32,285 psi | 87% | 1480 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 30,632 psi | 83% | 1434 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,405 psi | 47% | 1191 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 30,211 psi | 82% | 1552 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 72% | 33,388 psi | 90% | 1729 fps | 95.9% |
| Rottweil P 806² | <<locked>> | 76% | 33,344 psi | 90% | 1729 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 30,298 psi | 82% | 1683 fps | 92.5% |
| SNPE Vectan A0² | <<locked>> | 72% | 32,634 psi | 88% | 1555 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 31,705 psi | 86% | 1483 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 30,937 psi | 84% | 1496 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 31,604 psi | 85% | 1608 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 30,603 psi | 83% | 1496 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 31,444 psi | 85% | 1696 fps | 99.5% |
| Somchem MP200² | <<locked>> | 64% | 32,358 psi | 87% | 1588 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 32,198 psi | 87% | 1562 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 30,269 psi | 82% | 1601 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 84% | 33,301 psi | 90% | 1719 fps | 96.6% |
| Vihtavuori N105 | <<locked>> | 88% | 33,170 psi | 90% | 1762 fps | 99.1% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 33,040 psi | 89% | 1388 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 33,141 psi | 90% | 1539 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 32,489 psi | 88% | 1568 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 33,199 psi | 90% | 1644 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 30,269 psi | 82% | 1499 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. 2² | <<locked>> | 60% | 27,949 psi | 76% | 1493 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 25,715 psi | 70% | 1585 fps | 89.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 27,673 psi | 75% | 1375 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 24,540 psi | 66% | 1385 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 26,585 psi | 72% | 1588 fps | 85.7% |
| ADI AP 100*² | <<locked>> | 60% | 16,273 psi | 44% | 1280 fps | 90.8% |
| ADI APS 350² | <<locked>> | 60% | 29,109 psi | 79% | 1286 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 27,746 psi | 75% | 1299 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 26,861 psi | 73% | 1329 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 29,211 psi | 79% | 1421 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 25,222 psi | 68% | 1381 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 22,046 psi | 60% | 1476 fps | 85.3% |
| Alliant Green Dot² | <<locked>> | 60% | 27,195 psi | 74% | 1388 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 17,506 psi | 47% | 1286 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 24,250 psi | 66% | 1535 fps | 96% |
| Alliant RED DOT² | <<locked>> | 60% | 26,339 psi | 71% | 1342 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 24,700 psi | 67% | 1457 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 26,948 psi | 73% | 1371 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,114 psi | 46% | 1191 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 29,733 psi | 80% | 1434 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,438 psi | 63% | 1224 fps | 100% |
| Hodgdon TrailBoss² | 5.1 gr | 60% | 8,195 psi | 22% | 879 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 28,427 psi | 77% | 1467 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 25,715 psi | 70% | 1585 fps | 89.6% |
| Lovex S020² | <<locked>> | 60% | 28,848 psi | 78% | 1496 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 22,902 psi | 62% | 1348 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 24,816 psi | 67% | 1385 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 25,672 psi | 69% | 1371 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 27,775 psi | 75% | 1388 fps | 100% |
| ReloadSwiss RS 14² | 5.2 gr | 60% | 7,484 psi | 20% | 873 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 23,670 psi | 64% | 1434 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,046 psi | 60% | 1480 fps | 89.2% |
| Rottweil P 806² | <<locked>> | 60% | 18,202 psi | 49% | 1398 fps | 96.7% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 25,715 psi | 70% | 1585 fps | 89.6% |
| SNPE Vectan A0² | <<locked>> | 60% | 22,887 psi | 62% | 1381 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,166 psi | 76% | 1427 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 27,441 psi | 74% | 1437 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 19,653 psi | 53% | 1355 fps | 98.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 26,948 psi | 73% | 1434 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 27,528 psi | 74% | 1617 fps | 98.7% |
| Somchem MP200² | <<locked>> | 60% | 28,239 psi | 76% | 1519 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 25,541 psi | 69% | 1444 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 23,061 psi | 62% | 1457 fps | 99.7% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 17,521 psi | 47% | 1345 fps | 85.8% |
| Vihtavuori N105*² | <<locked>> | 64% | 14,257 psi | 39% | 1289 fps | 85.6% |
| Vihtavuori N32C Tin Star² | 6.9 gr | 60% | 14,605 psi | 39% | 1063 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 29,037 psi | 79% | 1476 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 25,106 psi | 68% | 1440 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 20,218 psi | 55% | 1388 fps | 99.1% |
| Winchester AutoComp ² | <<locked>> | 60% | 23,888 psi | 65% | 1388 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 50 powders for .357 Auto Mag. loaded with the .356 | 124gr | LEE Mold 356-124-2R. Vihtavuori N105 delivers the highest muzzle velocity at 1,762 fps; across all powders the maximum-charge window runs from 1,181 fps to 1,762 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 47–90 %, 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 .356 | 124gr | LEE Mold 356-124-2R they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, 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.