Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 123gr | Norma FMJ TC bullet and 44 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% | 33,185 psi | 90% | 1585 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 32,460 psi | 88% | 1729 fps | 93.6% |
| Accurate No. 9*² | <<locked>> | 72% | 32,793 psi | 89% | 1726 fps | 88.4% |
| Accurate Solo 1000² | <<locked>> | 64% | 32,068 psi | 87% | 1450 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 32,184 psi | 87% | 1516 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 32,576 psi | 88% | 1719 fps | 89.6% |
| ADI AP 100 | <<locked>> | 80% | 30,589 psi | 83% | 1637 fps | 99% |
| ADI APS 350² | <<locked>> | 64% | 32,401 psi | 88% | 1342 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,865 psi | 86% | 1371 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,662 psi | 86% | 1407 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 33,272 psi | 90% | 1516 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 33,330 psi | 90% | 1739 fps | 93% |
| Alliant Green Dot² | <<locked>> | 64% | 31,386 psi | 85% | 1457 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,981 psi | 86% | 1585 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 33,170 psi | 90% | 1732 fps | 99.2% |
| Alliant RED DOT² | <<locked>> | 64% | 30,705 psi | 83% | 1414 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,750 psi | 89% | 1604 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 31,488 psi | 85% | 1447 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 31,227 psi | 84% | 1450 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,691 psi | 86% | 1365 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,407 psi | 55% | 1207 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 32,460 psi | 88% | 1729 fps | 93.6% |
| Maxam CSB 1² | <<locked>> | 72% | 33,272 psi | 90% | 1526 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 30,255 psi | 82% | 1473 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 33,402 psi | 90% | 1503 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 32,329 psi | 87% | 1463 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,203 psi | 52% | 1220 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 32,053 psi | 87% | 1585 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 30,734 psi | 83% | 1680 fps | 94.8% |
| Rottweil P 806² | <<locked>> | 72% | 31,749 psi | 86% | 1699 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 32,460 psi | 88% | 1729 fps | 93.6% |
| SNPE Vectan A0² | <<locked>> | 68% | 30,487 psi | 82% | 1526 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 33,098 psi | 89% | 1509 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 32,343 psi | 87% | 1522 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 29,849 psi | 81% | 1578 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,821 psi | 86% | 1516 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 30,269 psi | 82% | 1532 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,981 psi | 86% | 1634 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 31,633 psi | 86% | 1686 fps | 96% |
| Vihtavuori N105 | <<locked>> | 84% | 31,430 psi | 85% | 1732 fps | 98.7% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 32,256 psi | 87% | 1381 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 29,907 psi | 81% | 1529 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 31,198 psi | 84% | 1617 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,966 psi | 86% | 1526 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% | 29,037 psi | 79% | 1516 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 27,862 psi | 75% | 1634 fps | 91% |
| Accurate No. 9*² | <<locked>> | 68% | 28,384 psi | 77% | 1634 fps | 85.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,718 psi | 78% | 1394 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,846 psi | 70% | 1407 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 28,529 psi | 77% | 1637 fps | 87.2% |
| ADI AP 100*² | <<locked>> | 60% | 17,506 psi | 47% | 1316 fps | 92.1% |
| ADI APS 350² | <<locked>> | 60% | 29,414 psi | 80% | 1299 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,587 psi | 77% | 1316 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,253 psi | 76% | 1355 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,498 psi | 72% | 1404 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,685 psi | 64% | 1519 fps | 86.8% |
| Alliant Green Dot² | <<locked>> | 60% | 28,645 psi | 77% | 1411 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 19,087 psi | 52% | 1322 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,904 psi | 70% | 1575 fps | 96.8% |
| Alliant RED DOT² | <<locked>> | 60% | 27,296 psi | 74% | 1358 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 26,266 psi | 71% | 1486 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,195 psi | 76% | 1394 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,536 psi | 50% | 1220 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,902 psi | 65% | 1234 fps | 100% |
| Hodgdon TrailBoss² | 5.2 gr | 60% | 9,514 psi | 26% | 912 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 27,862 psi | 75% | 1634 fps | 91% |
| Maxam CSB 1² | <<locked>> | 60% | 24,221 psi | 65% | 1371 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 27,151 psi | 73% | 1421 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 27,441 psi | 74% | 1404 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,993 psi | 78% | 1411 fps | 100% |
| ReloadSwiss RS 14² | 5.3 gr | 60% | 8,992 psi | 24% | 915 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 25,063 psi | 68% | 1460 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 23,627 psi | 64% | 1519 fps | 90.5% |
| Rottweil P 806² | <<locked>> | 60% | 20,972 psi | 57% | 1470 fps | 98.3% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 27,862 psi | 75% | 1634 fps | 91% |
| SNPE Vectan A0² | <<locked>> | 60% | 24,468 psi | 66% | 1414 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 29,617 psi | 80% | 1453 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,877 psi | 78% | 1467 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 21,205 psi | 57% | 1391 fps | 98.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 28,224 psi | 76% | 1457 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,861 psi | 73% | 1470 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,787 psi | 67% | 1496 fps | 99.9% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 16,926 psi | 46% | 1322 fps | 85.2% |
| Vihtavuori N105*² | <<locked>> | 60% | 14,011 psi | 38% | 1273 fps | 85.3% |
| Vihtavuori N32C Tin Star² | 7 gr | 60% | 15,940 psi | 43% | 1086 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,934 psi | 73% | 1476 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,524 psi | 58% | 1417 fps | 99.5% |
| Winchester AutoComp ² | <<locked>> | 60% | 25,251 psi | 68% | 1411 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 44 powders for .357 Auto Mag. loaded with the .355 | 123gr | Norma FMJ TC. Alliant BLUE DOT delivers the highest muzzle velocity at 1,739 fps; across all powders the maximum-charge window runs from 1,207 fps to 1,739 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 52–90 %, 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 .355 | 123gr | Norma FMJ TC 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.