Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 115gr | ALSA PRO FMJ bullet and 47 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% | 31,865 psi | 86% | 1621 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 30,472 psi | 82% | 1742 fps | 91.4% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,053 psi | 84% | 1486 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 30,995 psi | 84% | 1552 fps | 100% |
| ADI AP 100 | <<locked>> | 84% | 32,518 psi | 88% | 1729 fps | 98.9% |
| ADI APS 350² | <<locked>> | 64% | 32,227 psi | 87% | 1388 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,082 psi | 84% | 1407 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 30,676 psi | 83% | 1447 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 32,996 psi | 89% | 1535 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,126 psi | 87% | 1552 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 31,444 psi | 85% | 1752 fps | 90.7% |
| Alliant Green Dot² | <<locked>> | 64% | 30,327 psi | 82% | 1496 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 30,792 psi | 83% | 1624 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 31,734 psi | 86% | 1759 fps | 98.2% |
| Alliant RED DOT² | <<locked>> | 68% | 32,634 psi | 88% | 1499 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 31,459 psi | 85% | 1644 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,356 psi | 82% | 1483 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 33,098 psi | 89% | 1532 fps | 100% |
| Hodgdon Clays² | <<locked>> | 64% | 32,851 psi | 89% | 1414 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,624 psi | 53% | 1237 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 32,648 psi | 88% | 1591 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 30,472 psi | 82% | 1742 fps | 91.4% |
| Maxam CSB 1² | <<locked>> | 72% | 32,053 psi | 87% | 1565 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 32,227 psi | 87% | 1562 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 32,256 psi | 87% | 1539 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,256 psi | 85% | 1499 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,391 psi | 50% | 1250 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 30,632 psi | 83% | 1621 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 33,330 psi | 90% | 1788 fps | 94.9% |
| Rottweil P 806² | <<locked>> | 72% | 29,617 psi | 80% | 1719 fps | 99.9% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 30,472 psi | 82% | 1742 fps | 91.4% |
| SNPE Vectan A0² | <<locked>> | 72% | 32,343 psi | 87% | 1611 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 31,531 psi | 85% | 1539 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 30,748 psi | 83% | 1552 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 31,792 psi | 86% | 1670 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 30,661 psi | 83% | 1552 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 31,908 psi | 86% | 1762 fps | 99.2% |
| Somchem MP200² | <<locked>> | 64% | 32,314 psi | 87% | 1650 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 32,721 psi | 88% | 1631 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 30,603 psi | 83% | 1667 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 84% | 33,359 psi | 90% | 1775 fps | 95.7% |
| Vihtavuori N105 | <<locked>> | 88% | 32,953 psi | 89% | 1821 fps | 98.4% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 33,344 psi | 90% | 1447 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 33,083 psi | 89% | 1598 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 32,387 psi | 88% | 1627 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 33,373 psi | 90% | 1709 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 30,356 psi | 82% | 1555 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% | 27,876 psi | 75% | 1549 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 26,107 psi | 71% | 1644 fps | 88.5% |
| Accurate Solo 1000² | <<locked>> | 60% | 27,775 psi | 75% | 1430 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 24,772 psi | 67% | 1440 fps | 100% |
| ADI AP 100*² | <<locked>> | 60% | 16,665 psi | 45% | 1332 fps | 89.9% |
| ADI APS 350² | <<locked>> | 60% | 29,254 psi | 79% | 1342 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 27,818 psi | 75% | 1352 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,325 psi | 74% | 1388 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 30,153 psi | 82% | 1490 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 25,498 psi | 69% | 1440 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 76% | 25,309 psi | 68% | 1608 fps | 86.7% |
| Alliant Green Dot² | <<locked>> | 60% | 27,673 psi | 75% | 1447 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,260 psi | 49% | 1348 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 24,714 psi | 67% | 1598 fps | 95.3% |
| Alliant RED DOT² | <<locked>> | 60% | 26,905 psi | 73% | 1401 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,150 psi | 68% | 1522 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,151 psi | 73% | 1430 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,753 psi | 48% | 1250 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 29,805 psi | 81% | 1365 fps | 100% |
| Hodgdon TrailBoss² | 5.1 gr | 60% | 9,021 psi | 24% | 928 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 29,457 psi | 80% | 1539 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 26,107 psi | 71% | 1644 fps | 88.5% |
| Maxam CSB 1² | <<locked>> | 60% | 23,221 psi | 63% | 1404 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 25,947 psi | 70% | 1453 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,411 psi | 71% | 1440 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 27,949 psi | 76% | 1444 fps | 100% |
| ReloadSwiss RS 14² | 5.2 gr | 60% | 8,514 psi | 23% | 928 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 23,873 psi | 65% | 1490 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,191 psi | 60% | 1529 fps | 88% |
| Rottweil P 806² | <<locked>> | 60% | 19,406 psi | 52% | 1476 fps | 96.7% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 26,107 psi | 71% | 1644 fps | 88.5% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,047 psi | 62% | 1434 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,137 psi | 76% | 1483 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 27,369 psi | 74% | 1493 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,305 psi | 55% | 1414 fps | 97.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,166 psi | 73% | 1493 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 27,746 psi | 75% | 1677 fps | 98.1% |
| Somchem MP200² | <<locked>> | 60% | 28,863 psi | 78% | 1588 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 25,788 psi | 70% | 1503 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 23,670 psi | 64% | 1522 fps | 99.5% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,260 psi | 49% | 1407 fps | 85.2% |
| Vihtavuori N105*² | <<locked>> | 64% | 15,098 psi | 41% | 1358 fps | 85.4% |
| Vihtavuori N32C Tin Star² | 6.9 gr | 60% | 15,214 psi | 41% | 1109 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 29,167 psi | 79% | 1532 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 25,324 psi | 68% | 1499 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 20,479 psi | 55% | 1440 fps | 98.7% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,279 psi | 66% | 1444 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 47 powders for .357 Auto Mag. loaded with the .355 | 115gr | ALSA PRO FMJ. Vihtavuori N105 delivers the highest muzzle velocity at 1,821 fps; across all powders the maximum-charge window runs from 1,237 fps to 1,821 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 50–90 %, 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 | ALSA PRO FMJ they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Alliant BLUE DOT, Lovex D037.1 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.