Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 124gr | ALSA PRO FMJ bullet and 48 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% | 32,082 psi | 87% | 1552 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,488 psi | 85% | 1696 fps | 93% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,401 psi | 85% | 1424 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,676 psi | 86% | 1493 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 31,850 psi | 86% | 1690 fps | 89% |
| ADI AP 100 | <<locked>> | 80% | 30,139 psi | 81% | 1614 fps | 98.9% |
| ADI APS 350² | <<locked>> | 64% | 32,155 psi | 87% | 1325 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,183 psi | 84% | 1345 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 30,864 psi | 83% | 1385 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 33,069 psi | 89% | 1496 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,387 psi | 88% | 1706 fps | 92.4% |
| Alliant Green Dot² | <<locked>> | 64% | 31,270 psi | 85% | 1440 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,372 psi | 85% | 1562 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,619 psi | 88% | 1706 fps | 99% |
| Alliant RED DOT² | <<locked>> | 68% | 32,880 psi | 89% | 1434 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,329 psi | 87% | 1585 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,893 psi | 84% | 1424 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,516 psi | 83% | 1427 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,618 psi | 85% | 1348 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,233 psi | 55% | 1191 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 33,373 psi | 90% | 1532 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,488 psi | 85% | 1696 fps | 93% |
| Lovex D037.2*² | <<locked>> | 72% | 32,547 psi | 88% | 1709 fps | 88.1% |
| Maxam CSB 1² | <<locked>> | 72% | 32,822 psi | 89% | 1503 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 33,040 psi | 89% | 1503 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 32,837 psi | 89% | 1476 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,647 psi | 86% | 1437 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,652 psi | 50% | 1198 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,096 psi | 84% | 1555 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 30,023 psi | 81% | 1654 fps | 94.3% |
| Rottweil P 806² | <<locked>> | 72% | 30,835 psi | 83% | 1670 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 32,547 psi | 88% | 1709 fps | 88.1% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,488 psi | 85% | 1696 fps | 93% |
| SNPE Vectan A0² | <<locked>> | 72% | 33,272 psi | 90% | 1555 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,285 psi | 87% | 1483 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,531 psi | 85% | 1496 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 32,634 psi | 88% | 1611 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,372 psi | 85% | 1496 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 33,011 psi | 89% | 1713 fps | 99.7% |
| Somchem MP200² | <<locked>> | 64% | 33,315 psi | 90% | 1594 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 33,040 psi | 89% | 1562 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,386 psi | 85% | 1611 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 30,501 psi | 82% | 1654 fps | 95.4% |
| Vihtavuori N105 | <<locked>> | 84% | 30,647 psi | 83% | 1706 fps | 98.4% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,386 psi | 85% | 1352 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 33,359 psi | 90% | 1572 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,574 psi | 83% | 1591 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,256 psi | 85% | 1503 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% | 28,500 psi | 77% | 1493 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 26,876 psi | 73% | 1598 fps | 90.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,514 psi | 77% | 1378 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,135 psi | 68% | 1385 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,717 psi | 75% | 1604 fps | 86.5% |
| ADI AP 100*² | <<locked>> | 60% | 17,158 psi | 46% | 1293 fps | 91.6% |
| ADI APS 350² | <<locked>> | 60% | 29,704 psi | 80% | 1286 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,369 psi | 77% | 1299 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,963 psi | 76% | 1335 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,107 psi | 71% | 1388 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,061 psi | 62% | 1493 fps | 86.1% |
| Alliant Green Dot² | <<locked>> | 60% | 27,891 psi | 75% | 1385 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,985 psi | 51% | 1309 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,208 psi | 68% | 1549 fps | 96.4% |
| Alliant RED DOT² | <<locked>> | 60% | 26,919 psi | 73% | 1335 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,730 psi | 70% | 1463 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,543 psi | 74% | 1371 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,376 psi | 50% | 1207 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,091 psi | 65% | 1224 fps | 100% |
| Hodgdon TrailBoss² | 5 gr | 60% | 9,355 psi | 25% | 899 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 30,023 psi | 81% | 1480 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 26,876 psi | 73% | 1598 fps | 90.3% |
| Lovex D037.2*² | <<locked>> | 68% | 27,963 psi | 76% | 1614 fps | 85.2% |
| Maxam CSB 1² | <<locked>> | 60% | 23,583 psi | 64% | 1348 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,455 psi | 72% | 1398 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,731 psi | 72% | 1378 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,210 psi | 76% | 1385 fps | 100% |
| ReloadSwiss RS 14² | 5.1 gr | 60% | 8,847 psi | 24% | 902 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,526 psi | 66% | 1437 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,843 psi | 62% | 1486 fps | 89.8% |
| Rottweil P 806² | <<locked>> | 60% | 20,247 psi | 55% | 1444 fps | 98% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 27,963 psi | 76% | 1614 fps | 85.2% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 26,876 psi | 73% | 1598 fps | 90.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,946 psi | 65% | 1391 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,747 psi | 78% | 1427 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 27,992 psi | 76% | 1437 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,566 psi | 56% | 1365 fps | 98.5% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,659 psi | 75% | 1434 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,587 psi | 77% | 1627 fps | 98.9% |
| Somchem MP200² | <<locked>> | 60% | 29,646 psi | 80% | 1532 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,324 psi | 71% | 1447 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,105 psi | 65% | 1470 fps | 99.8% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,753 psi | 51% | 1368 fps | 87.2% |
| Vihtavuori N105*² | <<locked>> | 64% | 15,606 psi | 42% | 1325 fps | 87.7% |
| Vihtavuori N32C Tin Star² | 6.7 gr | 60% | 15,577 psi | 42% | 1066 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 25,933 psi | 70% | 1444 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,190 psi | 57% | 1398 fps | 99.4% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,903 psi | 67% | 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 48 powders for .357 Auto Mag. loaded with the .355 | 124gr | ALSA PRO FMJ. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,713 fps; across all powders the maximum-charge window runs from 1,191 fps to 1,713 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 48 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 50–90 %, 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 | ALSA PRO FMJ 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.