Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 124gr | Sellier & Bellot FMJ 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% | 32,489 psi | 88% | 1562 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,952 psi | 86% | 1706 fps | 93.3% |
| Accurate No. 9*² | <<locked>> | 72% | 31,995 psi | 87% | 1699 fps | 87.9% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,850 psi | 86% | 1434 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 32,068 psi | 87% | 1503 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 32,198 psi | 87% | 1703 fps | 89.4% |
| ADI AP 100 | <<locked>> | 80% | 30,298 psi | 82% | 1621 fps | 99% |
| ADI APS 350² | <<locked>> | 64% | 32,692 psi | 88% | 1335 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,662 psi | 86% | 1355 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,401 psi | 85% | 1394 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 33,301 psi | 90% | 1503 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,822 psi | 89% | 1716 fps | 92.7% |
| Alliant Green Dot² | <<locked>> | 64% | 31,154 psi | 84% | 1444 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 32,053 psi | 87% | 1578 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,808 psi | 89% | 1713 fps | 99.1% |
| Alliant RED DOT² | <<locked>> | 68% | 33,417 psi | 90% | 1447 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,692 psi | 88% | 1594 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 31,299 psi | 85% | 1434 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 31,227 psi | 84% | 1440 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,473 psi | 85% | 1352 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,204 psi | 55% | 1194 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,952 psi | 86% | 1706 fps | 93.3% |
| Lovex D037.2*² | <<locked>> | 72% | 32,851 psi | 89% | 1716 fps | 88.4% |
| Maxam CSB 1² | <<locked>> | 72% | 33,185 psi | 90% | 1512 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 33,446 psi | 90% | 1512 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 33,257 psi | 90% | 1490 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 32,126 psi | 87% | 1450 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,014 psi | 51% | 1211 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,430 psi | 85% | 1562 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 30,560 psi | 83% | 1670 fps | 94.7% |
| Rottweil P 806² | <<locked>> | 72% | 31,256 psi | 85% | 1683 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 32,851 psi | 89% | 1716 fps | 88.4% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,952 psi | 86% | 1706 fps | 93.3% |
| SNPE Vectan A0² | <<locked>> | 68% | 29,950 psi | 81% | 1506 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,561 psi | 88% | 1490 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,821 psi | 86% | 1503 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 33,243 psi | 90% | 1627 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,720 psi | 86% | 1503 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 33,214 psi | 90% | 1719 fps | 99.8% |
| Somchem MS200² | <<locked>> | 68% | 33,388 psi | 90% | 1572 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,604 psi | 85% | 1617 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 31,038 psi | 84% | 1667 fps | 95.8% |
| Vihtavuori N105 | <<locked>> | 84% | 31,256 psi | 85% | 1719 fps | 98.6% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,720 psi | 86% | 1362 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 29,878 psi | 81% | 1516 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,777 psi | 83% | 1598 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,502 psi | 85% | 1509 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% | 28,892 psi | 78% | 1503 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 27,340 psi | 74% | 1611 fps | 90.7% |
| Accurate No. 9*² | <<locked>> | 68% | 27,978 psi | 76% | 1617 fps | 85.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,442 psi | 77% | 1381 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,628 psi | 69% | 1394 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 28,094 psi | 76% | 1617 fps | 86.9% |
| ADI AP 100*² | <<locked>> | 60% | 17,405 psi | 47% | 1306 fps | 92% |
| ADI APS 350² | <<locked>> | 60% | 29,646 psi | 80% | 1289 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,282 psi | 76% | 1302 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,500 psi | 77% | 1348 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,440 psi | 71% | 1394 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,496 psi | 64% | 1506 fps | 86.6% |
| Alliant Green Dot² | <<locked>> | 60% | 28,398 psi | 77% | 1398 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,956 psi | 51% | 1309 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,498 psi | 69% | 1555 fps | 96.6% |
| Alliant RED DOT² | <<locked>> | 60% | 27,499 psi | 74% | 1352 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 26,107 psi | 71% | 1473 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,978 psi | 76% | 1381 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,376 psi | 50% | 1207 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,091 psi | 65% | 1227 fps | 100% |
| Hodgdon TrailBoss² | 5.1 gr | 60% | 9,471 psi | 26% | 902 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 27,340 psi | 74% | 1611 fps | 90.7% |
| Lovex D037.2*² | <<locked>> | 68% | 28,718 psi | 78% | 1634 fps | 85.9% |
| Maxam CSB 1² | <<locked>> | 60% | 24,004 psi | 65% | 1358 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,934 psi | 73% | 1407 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 27,195 psi | 74% | 1391 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,703 psi | 78% | 1394 fps | 100% |
| ReloadSwiss RS 14² | 5.2 gr | 60% | 8,949 psi | 24% | 909 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,903 psi | 67% | 1447 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 23,380 psi | 63% | 1503 fps | 90.3% |
| Rottweil P 806² | <<locked>> | 60% | 20,436 psi | 55% | 1447 fps | 98.1% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 28,718 psi | 78% | 1634 fps | 85.9% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 27,340 psi | 74% | 1611 fps | 90.7% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,844 psi | 64% | 1391 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 29,066 psi | 79% | 1434 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,326 psi | 77% | 1447 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,813 psi | 56% | 1375 fps | 98.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 28,079 psi | 76% | 1444 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 29,298 psi | 79% | 1644 fps | 99.2% |
| Somchem MS200² | <<locked>> | 60% | 26,716 psi | 72% | 1457 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,772 psi | 67% | 1486 fps | 99.9% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,956 psi | 51% | 1378 fps | 87.5% |
| Vihtavuori N105*² | <<locked>> | 60% | 13,967 psi | 38% | 1266 fps | 85.3% |
| Vihtavuori N32C Tin Star² | 6.9 gr | 60% | 16,012 psi | 43% | 1079 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,310 psi | 71% | 1453 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,480 psi | 58% | 1407 fps | 99.5% |
| Winchester AutoComp ² | <<locked>> | 60% | 25,164 psi | 68% | 1401 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 FMJ. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,719 fps; across all powders the maximum-charge window runs from 1,194 fps to 1,719 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 FMJ they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Accurate No. 9, Accurate TCM 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.