Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 90gr | Sierra Sports Master bullet and 51 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% | 30,168 psi | 82% | 1837 fps | 100% |
| Accurate No. 7*² | <<locked>> | 68% | 33,156 psi | 90% | 2028 fps | 89.4% |
| Accurate Solo 1000² | <<locked>> | 68% | 32,953 psi | 89% | 1768 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 72% | 32,619 psi | 88% | 1831 fps | 100% |
| ADI AP 100 | <<locked>> | 84% | 30,893 psi | 84% | 1929 fps | 96.6% |
| ADI APS 350² | <<locked>> | 64% | 30,821 psi | 83% | 1594 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 33,112 psi | 90% | 1673 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 32,126 psi | 87% | 1713 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 31,995 psi | 87% | 1768 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 30,719 psi | 83% | 1772 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 33,199 psi | 90% | 2014 fps | 88.3% |
| Alliant Green Dot² | <<locked>> | 68% | 32,576 psi | 88% | 1781 fps | 100% |
| Alliant Herco | <<locked>> | 84% | 32,082 psi | 87% | 1896 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 29,849 psi | 81% | 1955 fps | 95.2% |
| Alliant RED DOT² | <<locked>> | 68% | 31,299 psi | 85% | 1722 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 72% | 33,170 psi | 90% | 1932 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 32,053 psi | 87% | 1755 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 31,792 psi | 86% | 1752 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 32,372 psi | 88% | 1765 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 32,721 psi | 88% | 1667 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,623 psi | 50% | 1414 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 31,241 psi | 84% | 1821 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 33,156 psi | 90% | 2028 fps | 89.4% |
| Lovex S020² | <<locked>> | 64% | 31,778 psi | 86% | 1857 fps | 100% |
| Maxam CSB 1² | <<locked>> | 72% | 30,458 psi | 82% | 1785 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 30,618 psi | 83% | 1785 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 30,850 psi | 83% | 1762 fps | 100% |
| Maxam CSB 4² | <<locked>> | 68% | 32,895 psi | 89% | 1775 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 32,938 psi | 89% | 1713 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,332 psi | 47% | 1424 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 72% | 32,314 psi | 87% | 1903 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 31,386 psi | 85% | 1978 fps | 90.9% |
| Rottweil P 806² | <<locked>> | 76% | 31,981 psi | 86% | 1995 fps | 99.5% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 33,156 psi | 90% | 2028 fps | 89.4% |
| SNPE Vectan A0² | <<locked>> | 72% | 30,560 psi | 83% | 1827 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 30,269 psi | 82% | 1762 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 68% | 32,953 psi | 89% | 1837 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 30,240 psi | 82% | 1877 fps | 99.4% |
| SNPE Vectan BA9 1/2² | <<locked>> | 68% | 32,489 psi | 88% | 1837 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 29,834 psi | 81% | 1959 fps | 96.7% |
| Somchem MP200² | <<locked>> | 64% | 30,763 psi | 83% | 1873 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 30,748 psi | 83% | 1847 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 72% | 32,605 psi | 88% | 1949 fps | 99.9% |
| Vihtavuori 3N38* | <<locked>> | 84% | 31,372 psi | 85% | 1965 fps | 91.9% |
| Vihtavuori N105 | <<locked>> | 88% | 30,676 psi | 83% | 2008 fps | 95.2% |
| Vihtavuori N320² | <<locked>> | 64% | 32,184 psi | 87% | 1765 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 32,111 psi | 87% | 1663 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 31,662 psi | 86% | 1827 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 30,560 psi | 83% | 1844 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 31,705 psi | 86% | 1926 fps | 99.9% |
| Winchester AutoComp ² | <<locked>> | 72% | 32,561 psi | 88% | 1841 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% | 26,310 psi | 71% | 1755 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 28,311 psi | 77% | 1913 fps | 86.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 26,672 psi | 72% | 1647 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 23,540 psi | 64% | 1647 fps | 100% |
| ADI AP 100*² | <<locked>> | 64% | 17,782 psi | 48% | 1558 fps | 87.4% |
| ADI APS 350² | <<locked>> | 60% | 28,253 psi | 76% | 1545 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,861 psi | 73% | 1555 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 26,731 psi | 72% | 1608 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 28,631 psi | 77% | 1703 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 24,323 psi | 66% | 1644 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 29,878 psi | 81% | 1939 fps | 86.3% |
| Alliant Green Dot² | <<locked>> | 60% | 26,455 psi | 72% | 1660 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 17,419 psi | 47% | 1519 fps | 98.9% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 23,235 psi | 63% | 1772 fps | 91% |
| Alliant RED DOT² | <<locked>> | 60% | 25,440 psi | 69% | 1604 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 23,859 psi | 65% | 1722 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 25,991 psi | 70% | 1640 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,911 psi | 46% | 1424 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 28,587 psi | 77% | 1696 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,756 psi | 62% | 1467 fps | 100% |
| Hodgdon TrailBoss² | 5.8 gr | 60% | 8,485 psi | 23% | 1053 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 27,659 psi | 75% | 1749 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 28,311 psi | 77% | 1913 fps | 86.4% |
| Lovex S020² | <<locked>> | 60% | 27,963 psi | 76% | 1781 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 22,133 psi | 60% | 1604 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 24,424 psi | 66% | 1657 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 24,976 psi | 68% | 1644 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 26,658 psi | 72% | 1654 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 29,327 psi | 79% | 1647 fps | 100% |
| ReloadSwiss RS 14² | 6 gr | 60% | 8,166 psi | 22% | 1060 fps | 99.2% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 22,220 psi | 60% | 1683 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 64% | 24,004 psi | 65% | 1785 fps | 85.7% |
| Rottweil P 806*² | <<locked>> | 60% | 17,782 psi | 48% | 1611 fps | 92% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 28,311 psi | 77% | 1913 fps | 86.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 21,959 psi | 59% | 1627 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 27,006 psi | 73% | 1693 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 26,165 psi | 71% | 1703 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 18,927 psi | 51% | 1575 fps | 94.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 25,918 psi | 70% | 1703 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 25,962 psi | 70% | 1860 fps | 94.8% |
| Somchem MP200² | <<locked>> | 60% | 27,470 psi | 74% | 1798 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 24,511 psi | 66% | 1709 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 22,307 psi | 60% | 1703 fps | 97.3% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 24,584 psi | 66% | 1795 fps | 87.3% |
| Vihtavuori N105*² | <<locked>> | 76% | 20,769 psi | 56% | 1742 fps | 87.9% |
| Vihtavuori N320² | <<locked>> | 60% | 28,645 psi | 77% | 1703 fps | 100% |
| Vihtavuori N32C Tin Star² | 7.9 gr | 60% | 14,475 psi | 39% | 1276 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 27,833 psi | 75% | 1752 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 24,149 psi | 65% | 1703 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 19,102 psi | 52% | 1601 fps | 95.7% |
| Winchester AutoComp ² | <<locked>> | 60% | 23,003 psi | 62% | 1640 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 51 powders for .357 Auto Mag. loaded with the .355 | 90gr | Sierra Sports Master. Accurate No. 7 delivers the highest muzzle velocity at 2,028 fps; across all powders the maximum-charge window runs from 1,414 fps to 2,028 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 47–90 %, 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 | 90gr | Sierra Sports Master 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 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.