Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 115gr | Speer JHP bullet and 46 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% | 32,140 psi | 87% | 1631 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,430 psi | 85% | 1765 fps | 92.1% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,473 psi | 85% | 1503 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,821 psi | 86% | 1572 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 31,850 psi | 86% | 1759 fps | 88.1% |
| ADI AP 100 | <<locked>> | 84% | 33,286 psi | 90% | 1749 fps | 99.2% |
| ADI APS 350² | <<locked>> | 64% | 32,155 psi | 87% | 1394 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,473 psi | 85% | 1421 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,183 psi | 84% | 1463 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,706 psi | 88% | 1565 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,358 psi | 87% | 1778 fps | 91.5% |
| Alliant Green Dot² | <<locked>> | 64% | 31,328 psi | 85% | 1519 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,734 psi | 86% | 1647 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,242 psi | 87% | 1775 fps | 98.5% |
| Alliant RED DOT² | <<locked>> | 68% | 33,112 psi | 90% | 1516 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,256 psi | 87% | 1663 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,719 psi | 83% | 1496 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,661 psi | 83% | 1503 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 31,256 psi | 85% | 1572 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,256 psi | 85% | 1414 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,986 psi | 54% | 1250 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,430 psi | 85% | 1765 fps | 92.1% |
| Maxam CSB 1² | <<locked>> | 72% | 32,822 psi | 89% | 1581 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 32,576 psi | 88% | 1572 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 33,141 psi | 90% | 1562 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,662 psi | 86% | 1512 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,768 psi | 51% | 1263 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,372 psi | 85% | 1637 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 30,037 psi | 81% | 1729 fps | 93.6% |
| Rottweil P 806² | <<locked>> | 72% | 30,980 psi | 84% | 1745 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,430 psi | 85% | 1765 fps | 92.1% |
| SNPE Vectan A0² | <<locked>> | 72% | 32,967 psi | 89% | 1631 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,155 psi | 87% | 1555 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,372 psi | 85% | 1568 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 32,590 psi | 88% | 1690 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 30,937 psi | 84% | 1565 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 32,909 psi | 89% | 1788 fps | 99.5% |
| Somchem MP200² | <<locked>> | 64% | 32,953 psi | 89% | 1667 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 32,895 psi | 89% | 1640 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,053 psi | 84% | 1680 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 80% | 30,371 psi | 82% | 1722 fps | 94.6% |
| Vihtavuori N105 | <<locked>> | 84% | 30,313 psi | 82% | 1772 fps | 97.7% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,430 psi | 85% | 1424 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 33,083 psi | 89% | 1644 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,342 psi | 82% | 1663 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,328 psi | 85% | 1578 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% | 28,195 psi | 76% | 1562 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 27,064 psi | 73% | 1670 fps | 89.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,224 psi | 76% | 1447 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,179 psi | 68% | 1457 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,572 psi | 75% | 1670 fps | 85.4% |
| ADI AP 100*² | <<locked>> | 60% | 17,187 psi | 46% | 1352 fps | 90.7% |
| ADI APS 350² | <<locked>> | 60% | 29,254 psi | 79% | 1348 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,282 psi | 76% | 1368 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,905 psi | 75% | 1404 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,194 psi | 71% | 1457 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,163 psi | 63% | 1558 fps | 85.2% |
| Alliant Green Dot² | <<locked>> | 60% | 28,123 psi | 76% | 1463 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,884 psi | 51% | 1368 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,295 psi | 68% | 1617 fps | 95.8% |
| Alliant RED DOT² | <<locked>> | 60% | 26,977 psi | 73% | 1411 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,527 psi | 69% | 1532 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,572 psi | 75% | 1444 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,101 psi | 49% | 1263 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 27,949 psi | 76% | 1516 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,728 psi | 64% | 1283 fps | 100% |
| Hodgdon TrailBoss² | 5.3 gr | 60% | 9,253 psi | 25% | 942 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 27,064 psi | 73% | 1670 fps | 89.4% |
| Maxam CSB 1² | <<locked>> | 60% | 23,641 psi | 64% | 1417 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,397 psi | 71% | 1467 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,861 psi | 73% | 1453 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,442 psi | 77% | 1457 fps | 100% |
| ReloadSwiss RS 14² | 5.4 gr | 60% | 8,731 psi | 24% | 942 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,221 psi | 65% | 1503 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,887 psi | 62% | 1555 fps | 88.9% |
| Rottweil P 806² | <<locked>> | 60% | 20,015 psi | 54% | 1493 fps | 97.1% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 27,064 psi | 73% | 1670 fps | 89.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,772 psi | 64% | 1457 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,805 psi | 78% | 1499 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,079 psi | 76% | 1512 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,479 psi | 55% | 1424 fps | 97.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,978 psi | 76% | 1512 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,732 psi | 78% | 1706 fps | 98.6% |
| Somchem MP200² | <<locked>> | 60% | 29,530 psi | 80% | 1604 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,556 psi | 72% | 1526 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,221 psi | 65% | 1539 fps | 99.7% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,666 psi | 50% | 1424 fps | 85.9% |
| Vihtavuori N105*² | <<locked>> | 64% | 15,534 psi | 42% | 1375 fps | 86.2% |
| Vihtavuori N32C Tin Star² | 7.2 gr | 60% | 15,708 psi | 42% | 1125 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,107 psi | 71% | 1519 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,103 psi | 57% | 1460 fps | 99% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,889 psi | 67% | 1460 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 5 powders for .357 Auto Mag. loaded with the .355 | 115gr | Speer JHP. Vihtavuori N105 delivers the highest muzzle velocity at 1,772 fps; across all powders the maximum-charge window runs from 1,250 fps to 1,772 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 5 of the 5 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 51–90 %, 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 | 115gr | Speer JHP they combine a high case fill with complete burn and sit in the upper velocity band. 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.