Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 124gr | Sierra Sig V-Crown bullet and 42 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. 7*² | <<locked>> | 64% | 33,315 psi | 90% | 1745 fps | 94.3% |
| Accurate Solo 1000² | <<locked>> | 64% | 32,692 psi | 88% | 1460 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 32,721 psi | 88% | 1522 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 29,269 psi | 79% | 1654 fps | 88.1% |
| ADI AP 100 | <<locked>> | 80% | 31,662 psi | 86% | 1657 fps | 99.4% |
| ADI APS 350² | <<locked>> | 64% | 33,083 psi | 89% | 1355 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,850 psi | 86% | 1371 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,763 psi | 86% | 1411 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 30,618 psi | 83% | 1473 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 30,806 psi | 83% | 1683 fps | 92% |
| Alliant Green Dot² | <<locked>> | 64% | 32,010 psi | 87% | 1467 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 33,185 psi | 90% | 1604 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 64% | 30,168 psi | 82% | 1667 fps | 98.6% |
| Alliant RED DOT² | <<locked>> | 64% | 30,864 psi | 83% | 1417 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 64% | 30,182 psi | 82% | 1562 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 32,039 psi | 87% | 1453 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 31,966 psi | 86% | 1460 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 32,184 psi | 87% | 1375 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,943 psi | 57% | 1217 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 33,315 psi | 90% | 1745 fps | 94.3% |
| Maxam CSB 1² | <<locked>> | 68% | 30,589 psi | 83% | 1483 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 30,908 psi | 84% | 1480 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 30,676 psi | 83% | 1457 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 32,953 psi | 89% | 1470 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,711 psi | 53% | 1230 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 32,503 psi | 88% | 1588 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 68% | 31,734 psi | 86% | 1703 fps | 95.6% |
| Rottweil P 806² | <<locked>> | 72% | 33,083 psi | 89% | 1716 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 33,315 psi | 90% | 1745 fps | 94.3% |
| SNPE Vectan A0² | <<locked>> | 68% | 30,908 psi | 84% | 1532 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 33,402 psi | 90% | 1512 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 32,706 psi | 88% | 1526 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 30,951 psi | 84% | 1598 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 32,300 psi | 87% | 1522 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 30,763 psi | 83% | 1539 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 33,170 psi | 90% | 1654 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 32,619 psi | 88% | 1706 fps | 96.6% |
| Vihtavuori N105 | <<locked>> | 84% | 33,127 psi | 90% | 1762 fps | 99.2% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 32,634 psi | 88% | 1385 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 30,908 psi | 84% | 1542 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 31,966 psi | 86% | 1627 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 32,692 psi | 88% | 1535 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. 7*² | <<locked>> | 60% | 28,776 psi | 78% | 1650 fps | 92% |
| Accurate Solo 1000² | <<locked>> | 60% | 29,370 psi | 79% | 1407 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 26,440 psi | 71% | 1421 fps | 100% |
| Accurate TCM*² | <<locked>> | 64% | 25,657 psi | 69% | 1572 fps | 85.6% |
| ADI AP 100*² | <<locked>> | 60% | 17,883 psi | 48% | 1329 fps | 92.8% |
| ADI APS 350² | <<locked>> | 60% | 30,153 psi | 82% | 1309 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,196 psi | 79% | 1329 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,993 psi | 78% | 1365 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 27,398 psi | 74% | 1417 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 68% | 21,654 psi | 59% | 1467 fps | 85.5% |
| Alliant Green Dot² | <<locked>> | 60% | 28,790 psi | 78% | 1414 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 19,551 psi | 53% | 1332 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 26,731 psi | 72% | 1591 fps | 97.4% |
| Alliant RED DOT² | <<locked>> | 60% | 28,079 psi | 76% | 1371 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 26,861 psi | 73% | 1499 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,819 psi | 78% | 1404 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 19,029 psi | 51% | 1230 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,584 psi | 66% | 1247 fps | 100% |
| Hodgdon TrailBoss² | 5.3 gr | 60% | 9,558 psi | 26% | 912 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 28,776 psi | 78% | 1650 fps | 92% |
| Maxam CSB 1² | <<locked>> | 60% | 24,787 psi | 67% | 1381 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 27,325 psi | 74% | 1421 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 27,572 psi | 75% | 1407 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 29,646 psi | 80% | 1421 fps | 100% |
| ReloadSwiss RS 14² | 5.4 gr | 60% | 9,036 psi | 24% | 915 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 25,614 psi | 69% | 1470 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 24,265 psi | 66% | 1535 fps | 91.4% |
| Rottweil P 806² | <<locked>> | 60% | 21,538 psi | 58% | 1480 fps | 98.7% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 28,776 psi | 78% | 1650 fps | 92% |
| SNPE Vectan A0² | <<locked>> | 60% | 24,947 psi | 67% | 1421 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 30,008 psi | 81% | 1460 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 29,283 psi | 79% | 1470 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 21,553 psi | 58% | 1401 fps | 99.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 29,254 psi | 79% | 1473 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 27,833 psi | 75% | 1486 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 25,585 psi | 69% | 1509 fps | 100% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 17,506 psi | 47% | 1339 fps | 86.3% |
| Vihtavuori N105*² | <<locked>> | 60% | 14,620 psi | 40% | 1293 fps | 86.6% |
| Vihtavuori N32C Tin Star² | 7.2 gr | 60% | 16,201 psi | 44% | 1089 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 27,427 psi | 74% | 1483 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 22,365 psi | 60% | 1437 fps | 99.8% |
| Winchester AutoComp ² | <<locked>> | 60% | 26,078 psi | 71% | 1427 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 42 powders for .357 Auto Mag. loaded with the .355 | 124gr | Sierra Sig V-Crown. Vihtavuori N105 delivers the highest muzzle velocity at 1,762 fps; across all powders the maximum-charge window runs from 1,217 fps to 1,762 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 42 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 53–90 %, 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 | Sierra Sig V-Crown 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.