Load Specifications
Load data in caliber .357 Mag. with .355 | 90gr | Sierra Sports Master bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Rottweil P 806, Alliant UNIQUE and ReloadSwiss RS 20.
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"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 76% | 35,375 psi | 81% | 1768 fps | 100% |
| Accurate No. 5² | <<locked>> | 64% | 37,536 psi | 86% | 1896 fps | 97.4% |
| Accurate Solo 1000 | <<locked>> | 80% | 37,666 psi | 87% | 1693 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 84% | 36,753 psi | 84% | 1749 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 35,810 psi | 82% | 1860 fps | 95.5% |
| ADI AP 70N² | <<locked>> | 72% | 38,856 psi | 89% | 1801 fps | 100% |
| ADI APS 350 | <<locked>> | 80% | 39,102 psi | 90% | 1575 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 37,739 psi | 87% | 1598 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 36,941 psi | 85% | 1644 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 36,695 psi | 84% | 1699 fps | 100% |
| Alliant BE-86 | <<locked>> | 84% | 38,029 psi | 87% | 1745 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 76% | 38,493 psi | 88% | 1867 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 36,172 psi | 83% | 1696 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 36,999 psi | 85% | 1834 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 84% | 36,970 psi | 85% | 1936 fps | 95.1% |
| Alliant RED DOT | <<locked>> | 84% | 38,377 psi | 88% | 1693 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 35,723 psi | 82% | 1824 fps | 100% |
| Alliant UNIQUE | <<locked>> | 84% | 35,853 psi | 82% | 1827 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 36,927 psi | 85% | 1686 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 37,246 psi | 86% | 1696 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 37,884 psi | 87% | 1706 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 36,492 psi | 84% | 1555 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 35,549 psi | 82% | 1837 fps | 98.3% |
| Hodgdon Longshot² | <<locked>> | 68% | 39,291 psi | 90% | 1896 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 15,287 psi | 35% | 1224 fps | 100% |
| Hodgdon Universal | <<locked>> | 80% | 38,856 psi | 89% | 1801 fps | 100% |
| Lovex D036² | <<locked>> | 64% | 37,492 psi | 86% | 1896 fps | 97.4% |
| Lovex S011² | <<locked>> | 68% | 35,795 psi | 82% | 1703 fps | 100% |
| Lovex S020² | <<locked>> | 76% | 36,361 psi | 84% | 1785 fps | 100% |
| Maxam CSB 1 | <<locked>> | 88% | 36,579 psi | 84% | 1739 fps | 100% |
| Maxam CSB 2 | <<locked>> | 84% | 36,405 psi | 84% | 1742 fps | 100% |
| Maxam CSB 3 | <<locked>> | 84% | 38,072 psi | 88% | 1739 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 36,811 psi | 85% | 1693 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 37,942 psi | 87% | 1647 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 35,201 psi | 81% | 1808 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 35,984 psi | 83% | 1837 fps | 99.3% |
| ReloadSwiss RS 12² | <<locked>> | 72% | 35,563 psi | 82% | 1709 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 13,851 psi | 32% | 1214 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 88% | 38,377 psi | 88% | 1857 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 88% | 38,856 psi | 89% | 1952 fps | 90.5% |
| Rottweil P 801² | <<locked>> | 68% | 36,289 psi | 83% | 1680 fps | 100% |
| Rottweil P 806 | <<locked>> | 92% | 37,536 psi | 86% | 1959 fps | 99.2% |
| Shooters World Auto Pistol² | <<locked>> | 64% | 37,492 psi | 86% | 1896 fps | 97.4% |
| SNPE Vectan A0 | <<locked>> | 88% | 37,202 psi | 86% | 1791 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 80% | 38,595 psi | 89% | 1749 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 37,507 psi | 86% | 1759 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 76% | 39,247 psi | 90% | 1617 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 92% | 36,158 psi | 83% | 1827 fps | 99% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 36,782 psi | 85% | 1762 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 80% | 37,608 psi | 86% | 1962 fps | 97% |
| Somchem MP200 | <<locked>> | 80% | 38,972 psi | 90% | 1864 fps | 100% |
| Somchem MS200 | <<locked>> | 84% | 38,101 psi | 88% | 1821 fps | 100% |
| Somchem S221*² | <<locked>> | 72% | 36,187 psi | 83% | 1877 fps | 92.5% |
| Vihtavuori 3N37 | <<locked>> | 84% | 35,433 psi | 81% | 1844 fps | 99.4% |
| Vihtavuori 3N38*ᴾ | <<locked>> | 100% | 39,102 psi | 90% | 1936 fps | 91.4% |
| Vihtavuori N105*ᴾ | <<locked>> | 100% | 30,342 psi | 70% | 1841 fps | 91.2% |
| Vihtavuori N310² | <<locked>> | 64% | 36,260 psi | 83% | 1581 fps | 100% |
| Vihtavuori N320² | <<locked>> | 76% | 35,592 psi | 82% | 1683 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 33,779 psi | 78% | 1555 fps | 100% |
| Vihtavuori N330 | <<locked>> | 80% | 37,347 psi | 86% | 1781 fps | 100% |
| Vihtavuori N340 | <<locked>> | 84% | 38,101 psi | 88% | 1824 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 36,419 psi | 84% | 1857 fps | 99.6% |
| Winchester 231² | <<locked>> | 68% | 37,956 psi | 87% | 1755 fps | 100% |
| Winchester AutoComp | <<locked>> | 88% | 39,160 psi | 90% | 1798 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 21,074 psi | 48% | 1473 fps | 97.1% |
| Accurate No. 5² | <<locked>> | 60% | 32,140 psi | 74% | 1791 fps | 95.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 22,597 psi | 52% | 1427 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 19,203 psi | 44% | 1411 fps | 100% |
| ADI AP 100* | <<locked>> | 80% | 21,814 psi | 50% | 1542 fps | 87.3% |
| ADI AP 70N² | <<locked>> | 60% | 27,122 psi | 62% | 1604 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 25,106 psi | 58% | 1352 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 23,685 psi | 54% | 1365 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 22,872 psi | 53% | 1401 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 24,250 psi | 56% | 1480 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 19,667 psi | 45% | 1411 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 60% | 24,294 psi | 56% | 1588 fps | 99.8% |
| Alliant Green Dot² | <<locked>> | 60% | 22,292 psi | 51% | 1440 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 13,880 psi | 32% | 1273 fps | 93.7% |
| Alliant POWER PISTOL*² | <<locked>> | 68% | 23,163 psi | 53% | 1617 fps | 87.1% |
| Alliant RED DOT² | <<locked>> | 60% | 21,437 psi | 49% | 1391 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 28,065 psi | 65% | 1677 fps | 100% |
| Alliant UNIQUE² | 7.8 gr | 60% | 18,956 psi | 44% | 1450 fps | 97.7% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 21,625 psi | 50% | 1417 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 13,416 psi | 31% | 1217 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 22,887 psi | 53% | 1463 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 25,454 psi | 59% | 1375 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 26,890 psi | 62% | 1660 fps | 95.1% |
| Hodgdon Longshot² | <<locked>> | 60% | 29,805 psi | 69% | 1726 fps | 97.8% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,078 psi | 16% | 902 fps | 98.8% |
| Hodgdon Universal² | <<locked>> | 60% | 22,727 psi | 52% | 1506 fps | 100% |
| Lovex D036² | <<locked>> | 60% | 32,097 psi | 74% | 1795 fps | 95.6% |
| Lovex S011² | <<locked>> | 60% | 28,210 psi | 65% | 1575 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 21,915 psi | 50% | 1506 fps | 99.8% |
| Maxam CSB 1² | <<locked>> | 60% | 17,970 psi | 41% | 1368 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 19,160 psi | 44% | 1417 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 20,682 psi | 48% | 1417 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 22,539 psi | 52% | 1440 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 25,150 psi | 58% | 1437 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 26,658 psi | 61% | 1644 fps | 99.3% |
| Ramshot True Blue² | <<locked>> | 60% | 30,792 psi | 71% | 1739 fps | 98.1% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 25,237 psi | 58% | 1535 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 6,701 psi | 15% | 892 fps | 94.9% |
| ReloadSwiss RS 20² | 8.1 gr | 60% | 17,071 psi | 39% | 1414 fps | 98.4% |
| ReloadSwiss RS 24* | <<locked>> | 80% | 30,298 psi | 70% | 1781 fps | 85.9% |
| Rottweil P 801² | <<locked>> | 60% | 28,964 psi | 67% | 1565 fps | 100% |
| Rottweil P 806*² | 13.7 gr | 68% | 16,244 psi | 37% | 1450 fps | 86.5% |
| Shooters World Auto Pistol² | <<locked>> | 60% | 32,097 psi | 74% | 1795 fps | 95.6% |
| SNPE Vectan A0² | <<locked>> | 60% | 18,043 psi | 41% | 1381 fps | 97.1% |
| SNPE Vectan A1² | <<locked>> | 60% | 22,495 psi | 52% | 1467 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 21,625 psi | 50% | 1460 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 26,731 psi | 61% | 1421 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 15,156 psi | 35% | 1309 fps | 86.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 21,045 psi | 48% | 1460 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 19,087 psi | 44% | 1519 fps | 85.5% |
| Somchem MP200² | <<locked>> | 60% | 21,857 psi | 50% | 1519 fps | 98.3% |
| Somchem MS200² | <<locked>> | 60% | 19,957 psi | 46% | 1450 fps | 98.9% |
| Somchem S221*² | <<locked>> | 64% | 27,441 psi | 63% | 1693 fps | 87.7% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 17,274 psi | 40% | 1414 fps | 90.3% |
| Vihtavuori 3N38* | <<locked>> | 88% | 27,731 psi | 64% | 1716 fps | 85.2% |
| Vihtavuori N105* | <<locked>> | 92% | 24,236 psi | 56% | 1693 fps | 86.6% |
| Vihtavuori N310² | <<locked>> | 60% | 33,025 psi | 76% | 1532 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 22,756 psi | 52% | 1460 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 13,692 psi | 31% | 1161 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 20,798 psi | 48% | 1476 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 18,840 psi | 43% | 1427 fps | 98% |
| Vihtavuori N350*² | <<locked>> | 60% | 15,447 psi | 36% | 1352 fps | 88.7% |
| Winchester 231² | <<locked>> | 60% | 29,965 psi | 69% | 1627 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 18,434 psi | 42% | 1398 fps | 99.8% |
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 64 powders for .357 Mag. loaded with the .355 | 90gr | Sierra Sports Master. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,962 fps; across all powders the maximum-charge window runs from 1,214 fps to 1,962 fps. ADI AP 100 gives the best case fill at 100 %, and 40 of the 64 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 32–90 %, leaving at least 10 % headroom. ADI AP 100, Alliant Herco, Baschieri & Pellagri 102 Pistol 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. Rottweil P 806, Alliant UNIQUE, ReloadSwiss RS 20 rank at the top here: for .357 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, ReloadSwiss RS 24, Somchem S221, Vihtavuori 3N38 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.