Load Specifications
Load data in caliber .357 Auto Mag. with .355 | 115gr | Speer Hollow Point Gold Dot 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% | 1634 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 31,140 psi | 84% | 1762 fps | 91.9% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,604 psi | 85% | 1503 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,459 psi | 85% | 1565 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 31,575 psi | 85% | 1755 fps | 88% |
| ADI AP 100 | <<locked>> | 84% | 32,982 psi | 89% | 1742 fps | 99.1% |
| ADI APS 350² | <<locked>> | 64% | 32,271 psi | 87% | 1398 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,053 psi | 84% | 1411 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 30,734 psi | 83% | 1453 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,837 psi | 89% | 1568 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,518 psi | 88% | 1778 fps | 91.5% |
| Alliant Green Dot² | <<locked>> | 64% | 30,879 psi | 83% | 1509 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,415 psi | 85% | 1640 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,372 psi | 88% | 1778 fps | 98.5% |
| Alliant RED DOT² | <<locked>> | 68% | 32,677 psi | 88% | 1506 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 31,850 psi | 86% | 1657 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,835 psi | 83% | 1496 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,792 psi | 83% | 1503 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 31,401 psi | 85% | 1575 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,386 psi | 85% | 1417 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,073 psi | 54% | 1250 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 33,098 psi | 89% | 1604 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 31,140 psi | 84% | 1762 fps | 91.9% |
| Maxam CSB 1² | <<locked>> | 72% | 32,430 psi | 88% | 1575 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 32,706 psi | 88% | 1575 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 32,735 psi | 89% | 1552 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,241 psi | 84% | 1506 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,826 psi | 51% | 1263 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 30,995 psi | 84% | 1631 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 29,805 psi | 81% | 1719 fps | 93.4% |
| Rottweil P 806² | <<locked>> | 72% | 30,690 psi | 83% | 1742 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,140 psi | 84% | 1762 fps | 91.9% |
| SNPE Vectan A0² | <<locked>> | 72% | 33,112 psi | 90% | 1631 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,271 psi | 87% | 1558 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,546 psi | 85% | 1572 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 32,735 psi | 89% | 1690 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,053 psi | 84% | 1568 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 32,590 psi | 88% | 1781 fps | 99.4% |
| Somchem MP200² | <<locked>> | 64% | 33,083 psi | 89% | 1670 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 33,025 psi | 89% | 1640 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,227 psi | 84% | 1683 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 80% | 30,530 psi | 83% | 1726 fps | 94.7% |
| Vihtavuori N105 | <<locked>> | 84% | 30,487 psi | 82% | 1778 fps | 97.8% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,560 psi | 85% | 1427 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 33,214 psi | 90% | 1647 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,472 psi | 82% | 1663 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,038 psi | 84% | 1575 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% | 28,311 psi | 77% | 1565 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 26,818 psi | 73% | 1663 fps | 89.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,355 psi | 77% | 1447 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,295 psi | 68% | 1457 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,369 psi | 74% | 1663 fps | 85.2% |
| ADI AP 100*² | <<locked>> | 60% | 16,969 psi | 46% | 1345 fps | 90.5% |
| ADI APS 350² | <<locked>> | 60% | 29,370 psi | 79% | 1348 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,398 psi | 77% | 1368 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,007 psi | 76% | 1407 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 25,889 psi | 70% | 1453 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 76% | 25,962 psi | 70% | 1634 fps | 87.5% |
| Alliant Green Dot² | <<locked>> | 60% | 27,717 psi | 75% | 1457 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,608 psi | 50% | 1362 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,005 psi | 68% | 1611 fps | 95.6% |
| Alliant RED DOT² | <<locked>> | 60% | 27,079 psi | 73% | 1411 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,628 psi | 69% | 1535 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,688 psi | 75% | 1444 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,173 psi | 49% | 1263 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 28,065 psi | 76% | 1516 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,815 psi | 64% | 1283 fps | 100% |
| Hodgdon TrailBoss² | 5.3 gr | 60% | 9,268 psi | 25% | 942 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 29,950 psi | 81% | 1552 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 26,818 psi | 73% | 1663 fps | 89.3% |
| Maxam CSB 1² | <<locked>> | 60% | 23,728 psi | 64% | 1417 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,005 psi | 70% | 1460 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,484 psi | 72% | 1447 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,558 psi | 77% | 1460 fps | 100% |
| ReloadSwiss RS 14² | 5.4 gr | 60% | 8,760 psi | 24% | 942 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,308 psi | 66% | 1503 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,989 psi | 62% | 1555 fps | 88.9% |
| Rottweil P 806² | <<locked>> | 60% | 20,117 psi | 54% | 1496 fps | 97.2% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 26,818 psi | 73% | 1663 fps | 89.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,467 psi | 63% | 1450 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,964 psi | 78% | 1503 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,181 psi | 76% | 1512 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,566 psi | 56% | 1427 fps | 98% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,615 psi | 75% | 1506 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 28,413 psi | 77% | 1696 fps | 98.4% |
| Somchem MP200² | <<locked>> | 60% | 29,167 psi | 79% | 1601 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,208 psi | 71% | 1516 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,323 psi | 66% | 1542 fps | 99.7% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,753 psi | 51% | 1427 fps | 86% |
| Vihtavuori N105*² | <<locked>> | 64% | 15,621 psi | 42% | 1378 fps | 86.3% |
| Vihtavuori N32C Tin Star² | 7.2 gr | 60% | 15,780 psi | 43% | 1129 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,208 psi | 71% | 1522 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 20,827 psi | 56% | 1453 fps | 98.9% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,613 psi | 67% | 1457 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 5 powders for .357 Auto Mag. loaded with the .355 | 115gr | Speer Hollow Point Gold Dot. Vihtavuori N105 delivers the highest muzzle velocity at 1,778 fps; across all powders the maximum-charge window runs from 1,250 fps to 1,778 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 5 of the 5 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 51–89 %, leaving at least 11 % 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 | 115gr | Speer Hollow Point Gold Dot they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 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.