Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 90gr | Lehigh Defense Xtreme Penetrator bullet and 53 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Herco, Baschieri & Pellagri 102 Pistol and Vihtavuori N32C Tin Star.
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>> | 68% | 31,270 psi | 85% | 1854 fps | 100% |
| Accurate Solo 1000² | <<locked>> | 68% | 30,734 psi | 83% | 1722 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 72% | 30,327 psi | 82% | 1788 fps | 100% |
| ADI AP 100 | <<locked>> | 88% | 30,763 psi | 83% | 1923 fps | 96.1% |
| ADI APS 350² | <<locked>> | 68% | 32,300 psi | 87% | 1614 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 31,183 psi | 84% | 1634 fps | 100% |
| ADI AS 30² | <<locked>> | 72% | 33,141 psi | 90% | 1729 fps | 100% |
| ADI AS 50N² | <<locked>> | 68% | 32,953 psi | 89% | 1781 fps | 100% |
| Alliant BE-86² | <<locked>> | 72% | 31,488 psi | 85% | 1785 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 92% | 32,909 psi | 89% | 2005 fps | 87.5% |
| Alliant BULLSEYE² | <<locked>> | 64% | 31,140 psi | 84% | 1886 fps | 100% |
| Alliant Green Dot² | <<locked>> | 72% | 33,025 psi | 89% | 1788 fps | 100% |
| Alliant Herco | <<locked>> | 88% | 31,807 psi | 86% | 1890 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 72% | 30,603 psi | 83% | 1972 fps | 95.2% |
| Alliant RED DOT² | <<locked>> | 72% | 31,546 psi | 85% | 1726 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 72% | 30,182 psi | 82% | 1873 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 29,689 psi | 80% | 1709 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 88% | 31,807 psi | 86% | 1749 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 29,689 psi | 80% | 1719 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 72% | 33,417 psi | 90% | 1854 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 31,270 psi | 85% | 1631 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 16,665 psi | 45% | 1371 fps | 100% |
| Hodgdon Universal² | <<locked>> | 68% | 31,865 psi | 86% | 1834 fps | 100% |
| Lovex S020² | <<locked>> | 68% | 32,445 psi | 88% | 1867 fps | 100% |
| Maxam CSB 1² | <<locked>> | 76% | 31,096 psi | 84% | 1795 fps | 100% |
| Maxam CSB 2² | <<locked>> | 72% | 30,603 psi | 83% | 1788 fps | 100% |
| Maxam CSB 3² | <<locked>> | 72% | 32,010 psi | 87% | 1781 fps | 100% |
| Maxam CSB 4² | <<locked>> | 68% | 30,501 psi | 82% | 1729 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 30,879 psi | 83% | 1670 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 64% | 31,879 psi | 86% | 1791 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 14,750 psi | 40% | 1358 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 76% | 32,648 psi | 88% | 1909 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 76% | 31,705 psi | 86% | 1985 fps | 90.6% |
| Rottweil P 806 | <<locked>> | 80% | 31,038 psi | 84% | 1982 fps | 99.2% |
| SNPE Vectan A0² | <<locked>> | 76% | 31,517 psi | 85% | 1844 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 68% | 31,705 psi | 86% | 1781 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 68% | 30,821 psi | 83% | 1791 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 64% | 31,676 psi | 86% | 1640 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 80% | 30,821 psi | 83% | 1883 fps | 99.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 72% | 33,257 psi | 90% | 1847 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 68% | 30,052 psi | 81% | 1969 fps | 96.6% |
| Somchem MP200² | <<locked>> | 68% | 31,894 psi | 86% | 1893 fps | 100% |
| Somchem MS200² | <<locked>> | 72% | 31,850 psi | 86% | 1867 fps | 100% |
| Somchem S221*² | <<locked>> | 64% | 31,952 psi | 86% | 1965 fps | 93.8% |
| Vihtavuori 3N37² | <<locked>> | 76% | 33,199 psi | 90% | 1962 fps | 99.9% |
| Vihtavuori 3N38* | <<locked>> | 88% | 31,256 psi | 85% | 1959 fps | 91.2% |
| Vihtavuori N105* | <<locked>> | 92% | 30,240 psi | 82% | 2001 fps | 94.6% |
| Vihtavuori N320² | <<locked>> | 68% | 32,764 psi | 89% | 1778 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 31,662 psi | 86% | 1654 fps | 100% |
| Vihtavuori N330² | <<locked>> | 68% | 32,227 psi | 87% | 1837 fps | 100% |
| Vihtavuori N340² | <<locked>> | 72% | 31,778 psi | 86% | 1867 fps | 100% |
| Vihtavuori N350 | <<locked>> | 80% | 31,865 psi | 86% | 1929 fps | 99.9% |
| Winchester AutoComp ² | <<locked>> | 76% | 32,938 psi | 89% | 1847 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% | 24,033 psi | 65% | 1693 fps | 99.7% |
| Accurate Solo 1000² | <<locked>> | 60% | 24,685 psi | 67% | 1601 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 20,972 psi | 57% | 1585 fps | 100% |
| ADI AP 100*² | <<locked>> | 68% | 17,564 psi | 47% | 1552 fps | 86.6% |
| ADI APS 350² | <<locked>> | 60% | 26,760 psi | 72% | 1509 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 25,570 psi | 69% | 1526 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 24,221 psi | 65% | 1555 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 26,208 psi | 71% | 1654 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,002 psi | 59% | 1591 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 29,704 psi | 80% | 1932 fps | 85.5% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,644 psi | 75% | 1808 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,004 psi | 65% | 1608 fps | 100% |
| Alliant Herco² | 10.1 gr | 60% | 14,939 psi | 40% | 1437 fps | 97% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 20,523 psi | 55% | 1686 fps | 88.2% |
| Alliant RED DOT² | <<locked>> | 60% | 23,206 psi | 63% | 1555 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 21,074 psi | 57% | 1650 fps | 99.7% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 23,380 psi | 63% | 1585 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | 9.5 gr | 60% | 14,779 psi | 40% | 1368 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 25,788 psi | 70% | 1647 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 23,496 psi | 64% | 1654 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,219 psi | 57% | 1430 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 6,788 psi | 18% | 988 fps | 99.5% |
| Hodgdon Universal² | <<locked>> | 60% | 25,121 psi | 68% | 1696 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 24,889 psi | 67% | 1713 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 19,986 psi | 54% | 1549 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 21,205 psi | 57% | 1591 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 22,814 psi | 62% | 1594 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 24,468 psi | 66% | 1608 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,586 psi | 75% | 1611 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 28,268 psi | 76% | 1722 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 6,135 psi | 17% | 965 fps | 95.5% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 19,696 psi | 53% | 1617 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 24,337 psi | 66% | 1795 fps | 85.4% |
| Rottweil P 806*² | <<locked>> | 60% | 14,170 psi | 38% | 1486 fps | 86.7% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,189 psi | 55% | 1581 fps | 99.6% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,048 psi | 68% | 1650 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,236 psi | 66% | 1657 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,558 psi | 77% | 1585 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 16,708 psi | 45% | 1499 fps | 91.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 23,438 psi | 63% | 1647 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 22,321 psi | 60% | 1762 fps | 91.9% |
| Somchem MP200² | <<locked>> | 60% | 24,743 psi | 67% | 1739 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,075 psi | 60% | 1647 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 27,224 psi | 74% | 1854 fps | 91.2% |
| Vihtavuori 3N37² | <<locked>> | 60% | 19,479 psi | 53% | 1617 fps | 95.2% |
| Vihtavuori 3N38* | <<locked>> | 80% | 24,555 psi | 66% | 1791 fps | 86.7% |
| Vihtavuori N105* | <<locked>> | 80% | 19,986 psi | 54% | 1719 fps | 86.5% |
| Vihtavuori N320² | <<locked>> | 60% | 25,730 psi | 70% | 1644 fps | 100% |
| Vihtavuori N32C Tin Star² | 7.4 gr | 60% | 12,459 psi | 34% | 1227 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,092 psi | 68% | 1699 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 21,741 psi | 59% | 1644 fps | 99.9% |
| Vihtavuori N350*² | <<locked>> | 60% | 16,911 psi | 46% | 1532 fps | 93.4% |
| Winchester AutoComp ² | <<locked>> | 60% | 20,697 psi | 56% | 1585 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 7 powders for .357 Auto Mag. loaded with the .355 | 90gr | Lehigh Defense Xtreme Penetrator. Vihtavuori N105 delivers the highest muzzle velocity at 2,001 fps; across all powders the maximum-charge window runs from 1,358 fps to 2,001 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 7 of the 7 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 40–86 %, leaving at least 14 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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. Alliant Herco, Baschieri & Pellagri 102 Pistol, Vihtavuori N32C Tin Star rank at the top here: for .357 Auto Mag. with the .355 | 90gr | Lehigh Defense Xtreme Penetrator they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Vihtavuori N105 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.