Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 124gr | Sellier & Bellot TFMJ bullet and 47 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% | 32,271 psi | 87% | 1555 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,227 psi | 84% | 1690 fps | 92.8% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,517 psi | 85% | 1427 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,807 psi | 86% | 1496 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 31,589 psi | 85% | 1686 fps | 88.9% |
| ADI AP 100 | <<locked>> | 84% | 33,170 psi | 90% | 1667 fps | 99.5% |
| ADI APS 350² | <<locked>> | 64% | 32,285 psi | 87% | 1325 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,343 psi | 85% | 1345 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,009 psi | 84% | 1385 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,692 psi | 88% | 1490 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,561 psi | 88% | 1706 fps | 92.4% |
| Alliant Green Dot² | <<locked>> | 64% | 30,835 psi | 83% | 1434 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,531 psi | 85% | 1565 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,271 psi | 87% | 1696 fps | 98.9% |
| Alliant RED DOT² | <<locked>> | 68% | 33,011 psi | 89% | 1434 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 31,952 psi | 86% | 1578 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 31,038 psi | 84% | 1424 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,661 psi | 83% | 1427 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,198 psi | 84% | 1342 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,320 psi | 55% | 1194 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,227 psi | 84% | 1690 fps | 92.8% |
| Lovex D037.2*² | <<locked>> | 72% | 32,329 psi | 87% | 1703 fps | 87.9% |
| Maxam CSB 1² | <<locked>> | 72% | 32,982 psi | 89% | 1506 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 32,605 psi | 88% | 1496 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 32,953 psi | 89% | 1480 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,792 psi | 86% | 1437 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,724 psi | 51% | 1201 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,227 psi | 84% | 1555 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 29,733 psi | 80% | 1647 fps | 94.2% |
| Rottweil P 806² | <<locked>> | 72% | 30,530 psi | 83% | 1667 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 32,329 psi | 87% | 1703 fps | 87.9% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,227 psi | 84% | 1690 fps | 92.8% |
| SNPE Vectan A0² | <<locked>> | 72% | 32,880 psi | 89% | 1549 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,445 psi | 88% | 1483 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,662 psi | 86% | 1496 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 32,793 psi | 89% | 1614 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 30,937 psi | 84% | 1490 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 32,663 psi | 88% | 1706 fps | 99.7% |
| Somchem MP200² | <<locked>> | 64% | 32,953 psi | 89% | 1585 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 33,214 psi | 90% | 1565 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,067 psi | 84% | 1604 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 30,676 psi | 83% | 1654 fps | 95.4% |
| Vihtavuori N105 | <<locked>> | 84% | 30,284 psi | 82% | 1696 fps | 98.3% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,531 psi | 85% | 1355 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 32,938 psi | 89% | 1562 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,734 psi | 83% | 1594 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 30,937 psi | 84% | 1496 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% | 28,065 psi | 76% | 1483 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 27,021 psi | 73% | 1601 fps | 90.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,645 psi | 77% | 1381 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,295 psi | 68% | 1385 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,470 psi | 74% | 1598 fps | 86.3% |
| ADI AP 100*² | <<locked>> | 60% | 16,911 psi | 46% | 1286 fps | 91.4% |
| ADI APS 350² | <<locked>> | 60% | 29,211 psi | 79% | 1280 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,500 psi | 77% | 1299 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,079 psi | 76% | 1339 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,223 psi | 71% | 1388 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,134 psi | 63% | 1496 fps | 86.2% |
| Alliant Green Dot² | <<locked>> | 60% | 28,007 psi | 76% | 1388 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,695 psi | 51% | 1299 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,324 psi | 68% | 1549 fps | 96.4% |
| Alliant RED DOT² | <<locked>> | 60% | 27,021 psi | 73% | 1339 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,788 psi | 70% | 1467 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,659 psi | 75% | 1371 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,101 psi | 49% | 1201 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,699 psi | 64% | 1217 fps | 100% |
| Hodgdon TrailBoss² | 5 gr | 60% | 9,384 psi | 25% | 899 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 27,021 psi | 73% | 1601 fps | 90.4% |
| Lovex D037.2*² | <<locked>> | 68% | 28,152 psi | 76% | 1617 fps | 85.2% |
| Maxam CSB 1² | <<locked>> | 60% | 23,670 psi | 64% | 1348 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,049 psi | 70% | 1388 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,832 psi | 73% | 1381 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,340 psi | 77% | 1385 fps | 100% |
| ReloadSwiss RS 14² | 5.1 gr | 60% | 8,891 psi | 24% | 902 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,627 psi | 67% | 1440 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,960 psi | 62% | 1490 fps | 89.9% |
| Rottweil P 806² | <<locked>> | 60% | 20,059 psi | 54% | 1437 fps | 97.9% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 28,152 psi | 76% | 1617 fps | 85.2% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 27,021 psi | 73% | 1601 fps | 90.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,598 psi | 64% | 1381 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,877 psi | 78% | 1427 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,123 psi | 76% | 1437 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,639 psi | 56% | 1365 fps | 98.5% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,818 psi | 75% | 1434 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,689 psi | 78% | 1631 fps | 99% |
| Somchem MP200² | <<locked>> | 60% | 29,312 psi | 79% | 1526 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,440 psi | 71% | 1450 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,221 psi | 65% | 1470 fps | 99.8% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,550 psi | 50% | 1362 fps | 86.9% |
| Vihtavuori N105*² | <<locked>> | 64% | 15,664 psi | 42% | 1325 fps | 87.7% |
| Vihtavuori N32C Tin Star² | 6.7 gr | 60% | 15,635 psi | 42% | 1066 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,049 psi | 70% | 1447 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 20,871 psi | 56% | 1388 fps | 99.3% |
| Winchester AutoComp ² | <<locked>> | 60% | 25,005 psi | 68% | 1394 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 47 powders for .357 Auto Mag. loaded with the .355 | 124gr | Sellier & Bellot TFMJ. Alliant BLUE DOT delivers the highest muzzle velocity at 1,706 fps; across all powders the maximum-charge window runs from 1,194 fps to 1,706 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 51–90 %, 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 | 124gr | Sellier & Bellot TFMJ they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Accurate TCM, Alliant BLUE DOT 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.