Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 115gr | Lehigh Defense Xtreme Penetrator 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% | 31,763 psi | 86% | 1598 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,430 psi | 85% | 1739 fps | 91.5% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,589 psi | 85% | 1476 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,488 psi | 85% | 1539 fps | 100% |
| ADI AP 100 | <<locked>> | 84% | 32,953 psi | 89% | 1716 fps | 98.9% |
| ADI APS 350² | <<locked>> | 64% | 32,329 psi | 87% | 1371 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,415 psi | 85% | 1391 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,386 psi | 85% | 1434 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,663 psi | 88% | 1539 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,271 psi | 87% | 1749 fps | 90.9% |
| Alliant Green Dot² | <<locked>> | 64% | 31,227 psi | 84% | 1486 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,705 psi | 86% | 1617 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,097 psi | 87% | 1742 fps | 98.1% |
| Alliant RED DOT² | <<locked>> | 68% | 33,431 psi | 90% | 1490 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,489 psi | 88% | 1637 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,792 psi | 83% | 1467 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,734 psi | 83% | 1476 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,328 psi | 85% | 1388 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,726 psi | 56% | 1234 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,430 psi | 85% | 1739 fps | 91.5% |
| Maxam CSB 1² | <<locked>> | 72% | 32,750 psi | 89% | 1552 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 33,373 psi | 90% | 1555 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 33,228 psi | 90% | 1535 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,430 psi | 85% | 1480 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,827 psi | 54% | 1253 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,009 psi | 84% | 1604 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 29,776 psi | 81% | 1693 fps | 92.9% |
| Rottweil P 806² | <<locked>> | 72% | 31,444 psi | 85% | 1732 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,430 psi | 85% | 1739 fps | 91.5% |
| SNPE Vectan A0² | <<locked>> | 72% | 32,518 psi | 88% | 1594 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,126 psi | 87% | 1529 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,299 psi | 85% | 1542 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 32,634 psi | 88% | 1663 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,328 psi | 85% | 1542 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 32,808 psi | 89% | 1759 fps | 99.3% |
| Somchem MP200² | <<locked>> | 64% | 33,388 psi | 90% | 1644 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 32,967 psi | 89% | 1611 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,024 psi | 84% | 1654 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 80% | 30,385 psi | 82% | 1693 fps | 94.1% |
| Vihtavuori N105 | <<locked>> | 84% | 30,269 psi | 82% | 1749 fps | 97.4% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,778 psi | 86% | 1401 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 33,301 psi | 90% | 1621 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,618 psi | 83% | 1640 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,546 psi | 85% | 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% | 28,224 psi | 76% | 1535 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 27,006 psi | 73% | 1640 fps | 88.8% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,195 psi | 76% | 1421 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,657 psi | 69% | 1437 fps | 100% |
| ADI AP 100*² | <<locked>> | 60% | 17,637 psi | 48% | 1339 fps | 90.8% |
| ADI APS 350² | <<locked>> | 60% | 29,269 psi | 79% | 1322 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,543 psi | 77% | 1345 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,485 psi | 77% | 1385 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,397 psi | 71% | 1434 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 76% | 26,034 psi | 70% | 1604 fps | 86.9% |
| Alliant Green Dot² | <<locked>> | 60% | 28,485 psi | 77% | 1440 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 19,595 psi | 53% | 1358 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,396 psi | 69% | 1594 fps | 95.4% |
| Alliant RED DOT² | <<locked>> | 60% | 27,528 psi | 74% | 1388 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 26,020 psi | 70% | 1512 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,065 psi | 76% | 1421 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,942 psi | 51% | 1253 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,873 psi | 65% | 1260 fps | 100% |
| Hodgdon TrailBoss² | 4.9 gr | 60% | 10,472 psi | 28% | 945 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 27,006 psi | 73% | 1640 fps | 88.8% |
| Maxam CSB 1² | <<locked>> | 60% | 24,178 psi | 65% | 1401 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,905 psi | 73% | 1447 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,658 psi | 72% | 1421 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,587 psi | 77% | 1434 fps | 100% |
| ReloadSwiss RS 14² | 5 gr | 60% | 10,095 psi | 27% | 955 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,598 psi | 67% | 1486 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 23,250 psi | 63% | 1535 fps | 88.6% |
| Rottweil P 806² | <<locked>> | 60% | 21,292 psi | 58% | 1506 fps | 97.7% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 27,006 psi | 73% | 1640 fps | 88.8% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,946 psi | 65% | 1434 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,660 psi | 77% | 1473 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 27,876 psi | 75% | 1483 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,929 psi | 57% | 1411 fps | 97.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 28,239 psi | 76% | 1490 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,993 psi | 78% | 1680 fps | 98.4% |
| Somchem MP200² | <<locked>> | 60% | 29,805 psi | 81% | 1581 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,876 psi | 73% | 1503 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,453 psi | 66% | 1519 fps | 99.6% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 19,464 psi | 53% | 1421 fps | 86.3% |
| Vihtavuori N105*² | <<locked>> | 64% | 16,433 psi | 44% | 1381 fps | 87.2% |
| Vihtavuori N32C Tin Star² | 6.6 gr | 60% | 16,665 psi | 45% | 1115 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,571 psi | 72% | 1499 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,509 psi | 58% | 1444 fps | 99% |
| Winchester AutoComp ² | <<locked>> | 60% | 25,295 psi | 68% | 1440 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 | 115gr | Lehigh Defense Xtreme Penetrator. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,759 fps; across all powders the maximum-charge window runs from 1,234 fps to 1,759 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 54–90 %, 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 | Lehigh Defense Xtreme Penetrator 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.