Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 125gr | H&N KS HS LG bullet and 49 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% | 32,648 psi | 88% | 1575 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,850 psi | 86% | 1716 fps | 93.7% |
| Accurate No. 9*² | <<locked>> | 72% | 32,126 psi | 87% | 1713 fps | 88.5% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,792 psi | 86% | 1444 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,589 psi | 85% | 1506 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 32,401 psi | 88% | 1716 fps | 90% |
| ADI AP 100 | <<locked>> | 80% | 30,153 psi | 82% | 1627 fps | 99.1% |
| ADI APS 350² | <<locked>> | 64% | 32,343 psi | 87% | 1342 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,183 psi | 84% | 1355 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 30,530 psi | 83% | 1391 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,909 psi | 89% | 1509 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,808 psi | 89% | 1726 fps | 93.1% |
| Alliant Green Dot² | <<locked>> | 64% | 31,923 psi | 86% | 1457 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,285 psi | 85% | 1575 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,735 psi | 89% | 1719 fps | 99.2% |
| Alliant RED DOT² | <<locked>> | 68% | 33,098 psi | 89% | 1453 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,314 psi | 87% | 1598 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,893 psi | 84% | 1437 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,734 psi | 83% | 1440 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,473 psi | 85% | 1358 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,537 psi | 53% | 1194 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 33,431 psi | 90% | 1549 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,850 psi | 86% | 1716 fps | 93.7% |
| Lovex D037.2*² | <<locked>> | 72% | 32,982 psi | 89% | 1729 fps | 89% |
| Maxam CSB 1² | <<locked>> | 72% | 33,127 psi | 90% | 1522 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 32,503 psi | 88% | 1509 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 33,446 psi | 90% | 1499 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,894 psi | 86% | 1453 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,028 psi | 49% | 1204 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,256 psi | 85% | 1568 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 68% | 30,516 psi | 83% | 1677 fps | 95% |
| Rottweil P 806² | <<locked>> | 72% | 30,414 psi | 82% | 1673 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 32,982 psi | 89% | 1729 fps | 89% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,850 psi | 86% | 1716 fps | 93.7% |
| SNPE Vectan A0² | <<locked>> | 72% | 33,446 psi | 90% | 1572 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,518 psi | 88% | 1496 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,821 psi | 86% | 1509 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 33,040 psi | 89% | 1634 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,125 psi | 84% | 1506 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 33,199 psi | 90% | 1729 fps | 99.9% |
| Somchem MP200² | <<locked>> | 64% | 33,199 psi | 90% | 1604 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 33,170 psi | 90% | 1578 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,415 psi | 85% | 1624 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 30,792 psi | 83% | 1670 fps | 96% |
| Vihtavuori N105 | <<locked>> | 84% | 30,980 psi | 84% | 1722 fps | 98.8% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,270 psi | 85% | 1368 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 33,431 psi | 90% | 1585 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,777 psi | 83% | 1608 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 30,995 psi | 84% | 1509 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% | 28,543 psi | 77% | 1506 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 26,861 psi | 73% | 1611 fps | 90.9% |
| Accurate No. 9*² | <<locked>> | 68% | 27,659 psi | 75% | 1621 fps | 85.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,456 psi | 77% | 1391 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,251 psi | 68% | 1398 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,920 psi | 75% | 1624 fps | 87.3% |
| ADI AP 100*² | <<locked>> | 60% | 16,708 psi | 45% | 1296 fps | 91.6% |
| ADI APS 350² | <<locked>> | 60% | 29,399 psi | 79% | 1296 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,471 psi | 77% | 1312 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,746 psi | 75% | 1348 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,150 psi | 71% | 1401 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 22,800 psi | 62% | 1499 fps | 86.5% |
| Alliant Green Dot² | <<locked>> | 60% | 29,211 psi | 79% | 1411 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,072 psi | 49% | 1299 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,454 psi | 69% | 1565 fps | 96.9% |
| Alliant RED DOT² | <<locked>> | 60% | 26,760 psi | 72% | 1348 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,353 psi | 69% | 1473 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,630 psi | 75% | 1385 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,695 psi | 48% | 1204 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,743 psi | 64% | 1230 fps | 100% |
| Hodgdon TrailBoss² | 5.3 gr | 60% | 8,398 psi | 23% | 886 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 29,617 psi | 80% | 1486 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 26,861 psi | 73% | 1611 fps | 90.9% |
| Lovex D037.2*² | <<locked>> | 68% | 28,427 psi | 77% | 1637 fps | 86.2% |
| Maxam CSB 1² | <<locked>> | 60% | 23,598 psi | 64% | 1362 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,121 psi | 71% | 1404 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,440 psi | 71% | 1388 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,558 psi | 77% | 1401 fps | 100% |
| ReloadSwiss RS 14² | 5.4 gr | 60% | 7,687 psi | 21% | 879 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,323 psi | 66% | 1444 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,945 psi | 62% | 1503 fps | 90.4% |
| Rottweil P 806² | <<locked>> | 60% | 19,334 psi | 52% | 1427 fps | 97.6% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 28,427 psi | 77% | 1637 fps | 86.2% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 26,861 psi | 73% | 1611 fps | 90.9% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,888 psi | 65% | 1401 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 29,080 psi | 79% | 1444 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,355 psi | 77% | 1453 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,378 psi | 55% | 1375 fps | 98.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 28,050 psi | 76% | 1453 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,819 psi | 78% | 1644 fps | 99.2% |
| Somchem MP200² | <<locked>> | 60% | 29,646 psi | 80% | 1545 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,600 psi | 72% | 1463 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,265 psi | 66% | 1486 fps | 99.9% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,405 psi | 50% | 1371 fps | 87.3% |
| Vihtavuori N105*² | <<locked>> | 64% | 15,200 psi | 41% | 1319 fps | 87.5% |
| Vihtavuori N32C Tin Star² | 7.2 gr | 60% | 15,026 psi | 41% | 1073 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,150 psi | 71% | 1463 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,074 psi | 57% | 1407 fps | 99.5% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,758 psi | 67% | 1404 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 49 powders for .357 Auto Mag. loaded with the .356 | 125gr | H&N KS HS LG. Lovex D037.2 delivers the highest muzzle velocity at 1,729 fps; across all powders the maximum-charge window runs from 1,194 fps to 1,729 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 49 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 49–90 %, 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 | 125gr | H&N KS HS LG 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. 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.