Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 115gr | Sellier & Bellot FMJ bullet and 50 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N105, Vihtavuori N32C Tin Star and ReloadSwiss RS 14.
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% | 31,488 psi | 85% | 1611 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 29,994 psi | 81% | 1729 fps | 90.9% |
| Accurate Solo 1000² | <<locked>> | 64% | 30,618 psi | 83% | 1476 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 30,574 psi | 83% | 1542 fps | 100% |
| ADI AP 100 | <<locked>> | 84% | 31,952 psi | 86% | 1713 fps | 98.8% |
| ADI APS 350² | <<locked>> | 64% | 31,720 psi | 86% | 1378 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 30,647 psi | 83% | 1398 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 33,127 psi | 90% | 1483 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 33,141 psi | 90% | 1532 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 31,879 psi | 86% | 1545 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 31,053 psi | 84% | 1739 fps | 90.3% |
| Alliant Green Dot² | <<locked>> | 68% | 33,286 psi | 90% | 1539 fps | 100% |
| Alliant Herco | <<locked>> | 84% | 33,460 psi | 90% | 1667 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 31,082 psi | 84% | 1742 fps | 97.9% |
| Alliant RED DOT² | <<locked>> | 68% | 32,126 psi | 87% | 1490 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 31,111 psi | 84% | 1634 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 33,417 psi | 90% | 1526 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 32,909 psi | 89% | 1526 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 33,214 psi | 90% | 1535 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 33,301 psi | 90% | 1434 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,638 psi | 53% | 1234 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 32,285 psi | 87% | 1585 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 29,994 psi | 81% | 1729 fps | 90.9% |
| Lovex S020² | <<locked>> | 64% | 33,141 psi | 90% | 1621 fps | 100% |
| Maxam CSB 1² | <<locked>> | 72% | 31,705 psi | 86% | 1552 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 31,836 psi | 86% | 1552 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 31,836 psi | 86% | 1529 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 30,792 psi | 83% | 1490 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,043 psi | 49% | 1240 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 29,762 psi | 80% | 1601 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 32,822 psi | 89% | 1775 fps | 94.6% |
| Rottweil P 806² | <<locked>> | 76% | 33,431 psi | 90% | 1785 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 29,994 psi | 81% | 1729 fps | 90.9% |
| SNPE Vectan A0² | <<locked>> | 72% | 32,082 psi | 87% | 1604 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 31,256 psi | 85% | 1532 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 30,443 psi | 82% | 1542 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 31,676 psi | 86% | 1663 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 30,284 psi | 82% | 1545 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 31,212 psi | 84% | 1749 fps | 99.1% |
| Somchem MP200² | <<locked>> | 64% | 32,053 psi | 87% | 1640 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 31,850 psi | 86% | 1611 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 29,936 psi | 81% | 1650 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 84% | 32,808 psi | 89% | 1762 fps | 95.4% |
| Vihtavuori N105 | <<locked>> | 88% | 32,401 psi | 88% | 1808 fps | 98.3% |
| Vihtavuori N320² | <<locked>> | 64% | 33,141 psi | 90% | 1529 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 33,025 psi | 89% | 1437 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 32,692 psi | 88% | 1588 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 32,068 psi | 87% | 1617 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 33,170 psi | 90% | 1703 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 30,139 psi | 81% | 1549 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% | 27,441 psi | 74% | 1539 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 25,657 psi | 69% | 1627 fps | 88% |
| Accurate Solo 1000² | <<locked>> | 60% | 27,833 psi | 75% | 1430 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 24,308 psi | 66% | 1430 fps | 100% |
| ADI AP 100*² | <<locked>> | 60% | 16,447 psi | 44% | 1322 fps | 89.6% |
| ADI APS 350² | <<locked>> | 60% | 28,689 psi | 78% | 1329 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 27,876 psi | 75% | 1348 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,369 psi | 74% | 1385 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 29,675 psi | 80% | 1476 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 25,179 psi | 68% | 1434 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 76% | 24,845 psi | 67% | 1594 fps | 86.2% |
| Alliant Green Dot² | <<locked>> | 60% | 27,151 psi | 73% | 1437 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,260 psi | 49% | 1345 fps | 100% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 24,062 psi | 65% | 1578 fps | 94.8% |
| Alliant RED DOT² | <<locked>> | 60% | 26,324 psi | 71% | 1388 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 24,758 psi | 67% | 1509 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 26,716 psi | 72% | 1417 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,753 psi | 48% | 1247 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 29,646 psi | 80% | 1483 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,192 psi | 63% | 1263 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,905 psi | 24% | 922 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 29,022 psi | 78% | 1529 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 25,657 psi | 69% | 1627 fps | 88% |
| Lovex S020² | <<locked>> | 60% | 29,182 psi | 79% | 1555 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 22,800 psi | 62% | 1394 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 25,483 psi | 69% | 1444 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 25,947 psi | 70% | 1427 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 27,456 psi | 74% | 1434 fps | 100% |
| ReloadSwiss RS 14² | 5.1 gr | 60% | 8,427 psi | 23% | 922 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 23,453 psi | 63% | 1480 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,031 psi | 60% | 1519 fps | 87.7% |
| Rottweil P 806² | <<locked>> | 60% | 18,913 psi | 51% | 1463 fps | 96.3% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 25,657 psi | 69% | 1627 fps | 88% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,105 psi | 62% | 1434 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 27,833 psi | 75% | 1473 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 27,035 psi | 73% | 1483 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 19,725 psi | 53% | 1398 fps | 97.4% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,253 psi | 74% | 1493 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 27,485 psi | 74% | 1670 fps | 98% |
| Somchem MP200² | <<locked>> | 60% | 28,529 psi | 77% | 1578 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 25,396 psi | 69% | 1493 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 23,395 psi | 63% | 1512 fps | 99.4% |
| Vihtavuori 3N38*² | <<locked>> | 68% | 20,218 psi | 55% | 1463 fps | 87.2% |
| Vihtavuori N105*² | 13.2 gr | 68% | 16,839 psi | 46% | 1417 fps | 87.7% |
| Vihtavuori N320² | <<locked>> | 60% | 29,515 psi | 80% | 1473 fps | 100% |
| Vihtavuori N32C Tin Star² | 6.8 gr | 60% | 15,142 psi | 41% | 1106 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 29,283 psi | 79% | 1532 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 25,425 psi | 69% | 1496 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 20,218 psi | 55% | 1430 fps | 98.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 23,975 psi | 65% | 1437 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 50 powders for .357 Auto Mag. loaded with the .355 | 115gr | Sellier & Bellot FMJ. Vihtavuori N105 delivers the highest muzzle velocity at 1,808 fps; across all powders the maximum-charge window runs from 1,234 fps to 1,808 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 50 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 49–90 %, 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 N105, Vihtavuori N32C Tin Star, ReloadSwiss RS 14 rank at the top here: for .357 Auto Mag. with the .355 | 115gr | Sellier & Bellot FMJ 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.