Load Specifications
Load data in caliber .357 Mag. with .355 | 100gr | Speer JHP bullet and 67 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Rottweil P 806, Vihtavuori N350 and SNPE Vectan BA7 1/2.
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% | 36,056 psi | 83% | 1673 fps | 100% |
| Accurate No. 5² | <<locked>> | 64% | 38,754 psi | 89% | 1811 fps | 98.5% |
| Accurate No. 7* | <<locked>> | 80% | 39,073 psi | 90% | 1864 fps | 89.5% |
| Accurate Solo 1000 | <<locked>> | 80% | 38,551 psi | 89% | 1598 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 84% | 37,463 psi | 86% | 1654 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 37,144 psi | 85% | 1781 fps | 97% |
| ADI AP 70N² | <<locked>> | 68% | 35,897 psi | 83% | 1650 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 36,695 psi | 84% | 1444 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 38,957 psi | 90% | 1512 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 37,579 psi | 86% | 1549 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 37,623 psi | 86% | 1604 fps | 100% |
| Alliant BE-86 | <<locked>> | 84% | 39,233 psi | 90% | 1654 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 76% | 39,204 psi | 90% | 1762 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 37,057 psi | 85% | 1601 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 37,898 psi | 87% | 1739 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 84% | 38,232 psi | 88% | 1854 fps | 96.6% |
| Alliant RED DOT | <<locked>> | 84% | 39,044 psi | 90% | 1594 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 36,347 psi | 84% | 1722 fps | 100% |
| Alliant UNIQUE | <<locked>> | 84% | 37,637 psi | 87% | 1745 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 38,189 psi | 88% | 1594 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 38,508 psi | 89% | 1608 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 38,841 psi | 89% | 1621 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 37,246 psi | 86% | 1486 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 36,709 psi | 84% | 1755 fps | 99.2% |
| Hodgdon Longshot² | <<locked>> | 64% | 35,273 psi | 81% | 1729 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 15,824 psi | 36% | 1158 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 35,897 psi | 83% | 1650 fps | 100% |
| Lovex D036² | <<locked>> | 64% | 38,696 psi | 89% | 1814 fps | 98.5% |
| Lovex D037.1* | <<locked>> | 80% | 39,073 psi | 90% | 1864 fps | 89.5% |
| Lovex S011² | <<locked>> | 68% | 36,796 psi | 85% | 1611 fps | 100% |
| Lovex S020² | <<locked>> | 76% | 37,376 psi | 86% | 1690 fps | 100% |
| Maxam CSB 1 | <<locked>> | 88% | 38,116 psi | 88% | 1654 fps | 100% |
| Maxam CSB 2 | <<locked>> | 84% | 38,072 psi | 88% | 1657 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 35,534 psi | 82% | 1594 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 37,768 psi | 87% | 1601 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 38,595 psi | 89% | 1549 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 35,824 psi | 82% | 1713 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 37,028 psi | 85% | 1749 fps | 99.8% |
| ReloadSwiss RS 12² | <<locked>> | 72% | 36,970 psi | 85% | 1624 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 14,373 psi | 33% | 1155 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 36,201 psi | 83% | 1716 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 35,810 psi | 82% | 1798 fps | 90.6% |
| Rottweil P 801² | <<locked>> | 68% | 37,492 psi | 86% | 1591 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 34,447 psi | 79% | 1801 fps | 99.2% |
| Shooters World Auto Pistol² | <<locked>> | 64% | 38,696 psi | 89% | 1814 fps | 98.5% |
| Shooters World Major Pistol* | <<locked>> | 80% | 39,073 psi | 90% | 1864 fps | 89.5% |
| SNPE Vectan A0 | <<locked>> | 88% | 38,334 psi | 88% | 1699 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 36,042 psi | 83% | 1608 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 38,464 psi | 88% | 1667 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 36,637 psi | 84% | 1483 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 92% | 37,898 psi | 87% | 1752 fps | 99.7% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 37,536 psi | 86% | 1663 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 34,621 psi | 80% | 1801 fps | 97% |
| Somchem MP200² | <<locked>> | 76% | 36,085 psi | 83% | 1706 fps | 100% |
| Somchem MS200 | <<locked>> | 84% | 39,146 psi | 90% | 1726 fps | 100% |
| Somchem S221*² | <<locked>> | 72% | 37,304 psi | 86% | 1798 fps | 94.3% |
| Vihtavuori 3N37 | <<locked>> | 84% | 37,057 psi | 85% | 1765 fps | 99.9% |
| Vihtavuori 3N38*ᴾ | <<locked>> | 100% | 37,579 psi | 86% | 1814 fps | 92.2% |
| Vihtavuori N105*ᴾ | <<locked>> | 100% | 31,807 psi | 73% | 1778 fps | 93.7% |
| Vihtavuori N310² | <<locked>> | 64% | 39,160 psi | 90% | 1516 fps | 100% |
| Vihtavuori N320² | <<locked>> | 76% | 37,739 psi | 87% | 1604 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 29,356 psi | 67% | 1394 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 36,941 psi | 85% | 1663 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 35,505 psi | 82% | 1673 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 35,389 psi | 81% | 1732 fps | 99.8% |
| Winchester 231² | <<locked>> | 64% | 34,998 psi | 80% | 1604 fps | 100% |
| Winchester AutoComp | <<locked>> | 84% | 36,593 psi | 84% | 1657 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% | 22,075 psi | 51% | 1411 fps | 98.4% |
| Accurate No. 5² | <<locked>> | 60% | 33,562 psi | 77% | 1722 fps | 97.2% |
| Accurate No. 7*² | <<locked>> | 76% | 34,026 psi | 78% | 1772 fps | 86.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 23,177 psi | 53% | 1348 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 19,479 psi | 45% | 1329 fps | 100% |
| ADI AP 100*² | <<locked>> | 72% | 18,101 psi | 42% | 1352 fps | 85.3% |
| ADI AP 70N² | <<locked>> | 60% | 28,514 psi | 66% | 1529 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,020 psi | 60% | 1280 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 24,685 psi | 57% | 1293 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 23,337 psi | 54% | 1319 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 25,048 psi | 58% | 1401 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 20,233 psi | 47% | 1339 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 60% | 25,382 psi | 58% | 1519 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 22,945 psi | 53% | 1362 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 14,475 psi | 33% | 1220 fps | 95.7% |
| Alliant POWER PISTOL*² | <<locked>> | 64% | 21,190 psi | 49% | 1476 fps | 87.1% |
| Alliant RED DOT² | <<locked>> | 60% | 22,466 psi | 52% | 1322 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 28,892 psi | 66% | 1591 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 19,812 psi | 46% | 1391 fps | 98.9% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 21,843 psi | 50% | 1335 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 13,938 psi | 32% | 1158 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 23,946 psi | 55% | 1394 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 20,624 psi | 47% | 1214 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 28,021 psi | 64% | 1594 fps | 96.8% |
| Hodgdon Longshot² | <<locked>> | 60% | 31,038 psi | 71% | 1654 fps | 98.9% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,281 psi | 17% | 856 fps | 99.6% |
| Hodgdon Universal² | <<locked>> | 60% | 23,757 psi | 55% | 1434 fps | 100% |
| Lovex D036² | <<locked>> | 60% | 33,504 psi | 77% | 1722 fps | 97.2% |
| Lovex D037.1*² | <<locked>> | 76% | 34,026 psi | 78% | 1772 fps | 86.9% |
| Lovex S011² | <<locked>> | 60% | 29,428 psi | 68% | 1499 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 23,105 psi | 53% | 1444 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 18,666 psi | 43% | 1302 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 20,059 psi | 46% | 1348 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 21,393 psi | 49% | 1345 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 23,235 psi | 53% | 1362 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 25,773 psi | 59% | 1355 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 27,905 psi | 64% | 1572 fps | 99.9% |
| Ramshot True Blue² | <<locked>> | 60% | 32,053 psi | 74% | 1667 fps | 99.1% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 26,498 psi | 61% | 1463 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 6,904 psi | 16% | 850 fps | 96.6% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 18,057 psi | 42% | 1358 fps | 99.5% |
| ReloadSwiss RS 24*² | <<locked>> | 76% | 28,021 psi | 64% | 1640 fps | 86.1% |
| Rottweil P 801² | <<locked>> | 60% | 29,704 psi | 68% | 1476 fps | 100% |
| Rottweil P 806*² | 12.4 gr | 64% | 15,026 psi | 35% | 1335 fps | 86.8% |
| Shooters World Auto Pistol² | <<locked>> | 60% | 33,504 psi | 77% | 1722 fps | 97.2% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 34,026 psi | 78% | 1772 fps | 86.9% |
| SNPE Vectan A0² | <<locked>> | 60% | 18,391 psi | 42% | 1312 fps | 98.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 22,960 psi | 53% | 1385 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 22,133 psi | 51% | 1385 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 27,282 psi | 63% | 1339 fps | 100% |
| SNPE Vectan BA7 1/2*² | 8.5 gr | 60% | 15,650 psi | 36% | 1257 fps | 88.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 21,973 psi | 51% | 1391 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 20,218 psi | 46% | 1470 fps | 88.5% |
| Somchem MP200² | <<locked>> | 60% | 22,582 psi | 52% | 1447 fps | 99.2% |
| Somchem MS200² | <<locked>> | 60% | 20,842 psi | 48% | 1388 fps | 99.7% |
| Somchem S221*² | <<locked>> | 60% | 24,729 psi | 57% | 1542 fps | 87.4% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 17,970 psi | 41% | 1358 fps | 92.6% |
| Vihtavuori 3N38* | <<locked>> | 88% | 27,122 psi | 62% | 1611 fps | 86.5% |
| Vihtavuori N105* | <<locked>> | 88% | 22,263 psi | 51% | 1558 fps | 86.8% |
| Vihtavuori N310² | <<locked>> | 60% | 35,679 psi | 82% | 1470 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 23,873 psi | 55% | 1385 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 12,212 psi | 28% | 1043 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 22,713 psi | 52% | 1427 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 19,870 psi | 46% | 1371 fps | 99.2% |
| Vihtavuori N350*² | 8.3 gr | 60% | 15,374 psi | 35% | 1273 fps | 90.3% |
| Winchester 231² | <<locked>> | 60% | 30,879 psi | 71% | 1542 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 19,363 psi | 45% | 1335 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 67 powders for .357 Mag. loaded with the .355 | 100gr | Speer JHP. Accurate No. 7 delivers the highest muzzle velocity at 1,864 fps; across all powders the maximum-charge window runs from 1,155 fps to 1,864 fps. ADI AP 100 gives the best case fill at 100 %, and 38 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 33–90 %, 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, Vihtavuori N350, SNPE Vectan BA7 1/2 rank at the top here: for .357 Mag. with the .355 | 100gr | Speer JHP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Lovex D037.1, ReloadSwiss RS 24 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.