Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 123gr | LOS FP bullet and 72 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.
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: 6.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 9*² | <<locked>> | 68% | 32,184 psi | 87% | 1716 fps | 88.6% |
| Accurate Solo 1000² | <<locked>> | 64% | 33,156 psi | 90% | 1457 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 64% | 30,400 psi | 82% | 1476 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 64% | 31,169 psi | 84% | 1499 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 30,240 psi | 82% | 1660 fps | 88.3% |
| Accurate TCM*² | <<locked>> | 68% | 31,966 psi | 86% | 1709 fps | 89.9% |
| ADI AP 100 | <<locked>> | 80% | 32,256 psi | 87% | 1657 fps | 99.4% |
| ADI AP 100² | <<locked>> | 76% | 30,487 psi | 82% | 1637 fps | 99.2% |
| ADI APS 350² | <<locked>> | 64% | 33,214 psi | 90% | 1348 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 32,140 psi | 87% | 1365 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 32,924 psi | 89% | 1391 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 32,445 psi | 88% | 1407 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 33,431 psi | 90% | 1437 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 31,415 psi | 85% | 1473 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 32,692 psi | 88% | 1506 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 31,633 psi | 86% | 1693 fps | 92.2% |
| Alliant BLUE DOT* | <<locked>> | 80% | 33,185 psi | 90% | 1736 fps | 93.4% |
| Alliant Green Dot² | <<locked>> | 64% | 32,851 psi | 89% | 1467 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 31,169 psi | 84% | 1558 fps | 100% |
| Alliant Herco² | <<locked>> | 76% | 32,213 psi | 87% | 1588 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 64% | 31,183 psi | 84% | 1680 fps | 98.7% |
| Alliant POWER PISTOL² | <<locked>> | 64% | 32,256 psi | 87% | 1713 fps | 99.2% |
| Alliant RED DOT² | <<locked>> | 64% | 31,604 psi | 85% | 1414 fps | 100% |
| Alliant RED DOT² | <<locked>> | 64% | 32,692 psi | 88% | 1444 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 64% | 31,024 psi | 84% | 1562 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 64% | 32,155 psi | 87% | 1591 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 32,909 psi | 89% | 1457 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 32,895 psi | 89% | 1463 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 76% | 31,169 psi | 84% | 1447 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 32,561 psi | 88% | 1368 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 33,286 psi | 90% | 1394 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 22,046 psi | 60% | 1220 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 22,814 psi | 62% | 1247 fps | 100% |
| Lovex D037.2*² | <<locked>> | 68% | 32,895 psi | 89% | 1729 fps | 89% |
| Maxam CSB 1² | <<locked>> | 68% | 31,589 psi | 85% | 1486 fps | 100% |
| Maxam CSB 1² | <<locked>> | 68% | 32,663 psi | 88% | 1516 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 32,358 psi | 87% | 1490 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 33,127 psi | 90% | 1509 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 31,473 psi | 85% | 1460 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 32,285 psi | 87% | 1483 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 33,054 psi | 89% | 1460 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 21,176 psi | 57% | 1240 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 21,872 psi | 59% | 1266 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 30,139 psi | 81% | 1539 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 64% | 31,270 psi | 85% | 1568 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 68% | 32,706 psi | 88% | 1709 fps | 95.7% |
| ReloadSwiss RS 24*² | <<locked>> | 64% | 30,052 psi | 81% | 1667 fps | 94.9% |
| Rottweil P 806² | <<locked>> | 68% | 30,879 psi | 83% | 1670 fps | 100% |
| Rottweil P 806² | <<locked>> | 68% | 32,561 psi | 88% | 1703 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 32,895 psi | 89% | 1729 fps | 89% |
| SNPE Vectan A0² | <<locked>> | 68% | 31,386 psi | 85% | 1529 fps | 100% |
| SNPE Vectan A0² | <<locked>> | 68% | 32,750 psi | 89% | 1562 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 33,127 psi | 90% | 1522 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 31,488 psi | 85% | 1598 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 32,764 psi | 89% | 1631 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 33,388 psi | 90% | 1529 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 31,836 psi | 86% | 1545 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 32,837 psi | 89% | 1572 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 64% | 30,124 psi | 81% | 1588 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 64% | 31,183 psi | 84% | 1617 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 33,373 psi | 90% | 1709 fps | 96.7% |
| Vihtavuori 3N38² | <<locked>> | 76% | 31,299 psi | 85% | 1680 fps | 96.2% |
| Vihtavuori N105 | <<locked>> | 80% | 30,168 psi | 82% | 1696 fps | 98.3% |
| Vihtavuori N105 | <<locked>> | 80% | 32,300 psi | 87% | 1745 fps | 99.1% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 31,517 psi | 85% | 1355 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 88% | 31,981 psi | 86% | 1371 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 31,575 psi | 85% | 1542 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 33,112 psi | 90% | 1578 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 32,996 psi | 89% | 1634 fps | 100% |
| Vihtavuori N350² | <<locked>> | 68% | 30,792 psi | 83% | 1608 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 33,214 psi | 90% | 1532 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 64% | 31,169 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. 9*² | <<locked>> | 64% | 27,891 psi | 75% | 1624 fps | 85.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 29,820 psi | 81% | 1404 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 27,325 psi | 74% | 1421 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 28,195 psi | 76% | 1447 fps | 100% |
| Accurate TCM*² | <<locked>> | 64% | 26,629 psi | 72% | 1581 fps | 85.9% |
| Accurate TCM*² | <<locked>> | 64% | 28,021 psi | 76% | 1624 fps | 87.4% |
| ADI AP 100*² | <<locked>> | 60% | 19,087 psi | 52% | 1348 fps | 93.6% |
| ADI AP 100*² | <<locked>> | 60% | 19,856 psi | 54% | 1381 fps | 94.6% |
| ADI APS 350² | <<locked>> | 60% | 30,240 psi | 82% | 1302 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,399 psi | 79% | 1322 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,805 psi | 81% | 1342 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 29,646 psi | 80% | 1365 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 30,153 psi | 82% | 1385 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 28,152 psi | 76% | 1421 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 29,109 psi | 79% | 1447 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 68% | 22,814 psi | 62% | 1483 fps | 86.2% |
| Alliant BLUE DOT*² | <<locked>> | 64% | 21,466 psi | 58% | 1457 fps | 85.5% |
| Alliant Green Dot² | <<locked>> | 60% | 29,602 psi | 80% | 1414 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 20,885 psi | 56% | 1348 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 21,814 psi | 59% | 1381 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 27,673 psi | 75% | 1604 fps | 97.6% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 28,848 psi | 78% | 1640 fps | 98.3% |
| Alliant RED DOT² | <<locked>> | 60% | 28,761 psi | 78% | 1368 fps | 100% |
| Alliant RED DOT² | <<locked>> | 60% | 29,428 psi | 80% | 1391 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 28,094 psi | 76% | 1509 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 28,877 psi | 78% | 1532 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 29,631 psi | 80% | 1404 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 20,218 psi | 55% | 1240 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 20,900 psi | 57% | 1263 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,831 psi | 67% | 1240 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 25,396 psi | 69% | 1263 fps | 100% |
| Hodgdon TrailBoss² | 5.5 gr | 60% | 11,066 psi | 30% | 935 fps | 100% |
| Hodgdon TrailBoss² | 5.5 gr | 60% | 11,255 psi | 30% | 948 fps | 100% |
| Lovex D037.2*² | <<locked>> | 64% | 28,543 psi | 77% | 1637 fps | 86.3% |
| Maxam CSB 1² | <<locked>> | 60% | 25,730 psi | 70% | 1385 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 26,556 psi | 72% | 1411 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 28,747 psi | 78% | 1430 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 30,153 psi | 82% | 1463 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 28,311 psi | 77% | 1407 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 29,269 psi | 79% | 1434 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 30,284 psi | 82% | 1417 fps | 100% |
| ReloadSwiss RS 14² | 5.6 gr | 60% | 10,675 psi | 29% | 945 fps | 100% |
| ReloadSwiss RS 14² | 5.6 gr | 60% | 10,849 psi | 29% | 958 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 26,789 psi | 72% | 1476 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 27,978 psi | 76% | 1509 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 25,150 psi | 68% | 1545 fps | 91.7% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 26,701 psi | 72% | 1591 fps | 93.1% |
| Rottweil P 806² | <<locked>> | 60% | 23,569 psi | 64% | 1516 fps | 99.3% |
| Rottweil P 806² | <<locked>> | 60% | 25,251 psi | 68% | 1558 fps | 99.8% |
| Shooters World Heavy Pistol*² | <<locked>> | 64% | 28,543 psi | 77% | 1637 fps | 86.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 25,353 psi | 69% | 1421 fps | 100% |
| SNPE Vectan A0² | <<locked>> | 60% | 26,455 psi | 72% | 1453 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 29,689 psi | 80% | 1467 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 22,408 psi | 61% | 1407 fps | 99.2% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 23,511 psi | 64% | 1444 fps | 99.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 29,776 psi | 81% | 1470 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 28,369 psi | 77% | 1483 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 29,486 psi | 80% | 1516 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 26,643 psi | 72% | 1519 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 27,818 psi | 75% | 1555 fps | 100% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 18,855 psi | 51% | 1365 fps | 87.5% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 19,783 psi | 53% | 1401 fps | 88.9% |
| Vihtavuori N105*² | <<locked>> | 60% | 16,114 psi | 44% | 1332 fps | 88.7% |
| Vihtavuori N105*² | <<locked>> | 60% | 17,114 psi | 46% | 1371 fps | 90.3% |
| Vihtavuori N32C Tin Star² | 7.5 gr | 60% | 17,666 psi | 48% | 1102 fps | 100% |
| Vihtavuori N32C Tin Star² | 7.5 gr | 60% | 18,289 psi | 49% | 1125 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 28,137 psi | 76% | 1483 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 29,211 psi | 79% | 1512 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 23,279 psi | 63% | 1444 fps | 99.9% |
| Vihtavuori N350² | <<locked>> | 60% | 24,192 psi | 65% | 1473 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 26,963 psi | 73% | 1427 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 27,833 psi | 75% | 1453 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 72 powders for .357 Auto Mag. loaded with the .356 | 123gr | LOS FP. Vihtavuori N105 delivers the highest muzzle velocity at 1,745 fps; across all powders the maximum-charge window runs from 1,220 fps to 1,745 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 13 of the 72 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, 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 | 123gr | LOS FP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 9, Accurate TCM, Accurate TCM burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, Hodgdon TrailBoss, ReloadSwiss RS 14 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.