Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 122gr | Rim Rock TC Top Shelf bullet and 44 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% | 32,953 psi | 89% | 1591 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 32,416 psi | 88% | 1736 fps | 93.5% |
| Accurate No. 9*² | <<locked>> | 72% | 33,098 psi | 89% | 1742 fps | 88.5% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,952 psi | 86% | 1460 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 32,605 psi | 88% | 1532 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 32,924 psi | 89% | 1736 fps | 89.8% |
| ADI AP 100 | <<locked>> | 80% | 31,169 psi | 84% | 1657 fps | 99.2% |
| ADI APS 350² | <<locked>> | 64% | 32,996 psi | 89% | 1362 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,807 psi | 86% | 1378 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,604 psi | 85% | 1417 fps | 100% |
| Alliant BE-86² | <<locked>> | 64% | 30,066 psi | 81% | 1473 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 29,965 psi | 81% | 1677 fps | 91.2% |
| Alliant Green Dot² | <<locked>> | 64% | 31,865 psi | 86% | 1473 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 32,198 psi | 87% | 1598 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 33,330 psi | 90% | 1742 fps | 99.2% |
| Alliant RED DOT² | <<locked>> | 64% | 30,661 psi | 83% | 1424 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 33,112 psi | 90% | 1621 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 31,314 psi | 85% | 1453 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 31,444 psi | 85% | 1463 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,589 psi | 85% | 1371 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,784 psi | 56% | 1224 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 32,416 psi | 88% | 1736 fps | 93.5% |
| Maxam CSB 1² | <<locked>> | 68% | 30,429 psi | 82% | 1493 fps | 100% |
| Maxam CSB 2² | <<locked>> | 64% | 30,168 psi | 82% | 1480 fps | 100% |
| Maxam CSB 3² | <<locked>> | 64% | 30,516 psi | 83% | 1467 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 32,227 psi | 87% | 1470 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,189 psi | 52% | 1227 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 32,343 psi | 87% | 1598 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 30,806 psi | 83% | 1693 fps | 94.8% |
| Rottweil P 806² | <<locked>> | 72% | 32,155 psi | 87% | 1716 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 32,416 psi | 88% | 1736 fps | 93.5% |
| SNPE Vectan A0² | <<locked>> | 68% | 30,284 psi | 82% | 1529 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,866 psi | 89% | 1516 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 32,111 psi | 87% | 1526 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 72% | 29,994 psi | 81% | 1591 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 32,155 psi | 87% | 1532 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 30,603 psi | 83% | 1545 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 32,155 psi | 87% | 1647 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 31,691 psi | 86% | 1699 fps | 96% |
| Vihtavuori N105 | <<locked>> | 84% | 31,937 psi | 86% | 1749 fps | 98.8% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 32,068 psi | 87% | 1385 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 30,269 psi | 82% | 1545 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 31,401 psi | 85% | 1631 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,705 psi | 86% | 1532 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% | 28,877 psi | 78% | 1522 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 27,891 psi | 75% | 1644 fps | 91% |
| Accurate No. 9*² | <<locked>> | 68% | 28,297 psi | 77% | 1644 fps | 85.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,674 psi | 78% | 1404 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,744 psi | 70% | 1417 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 28,471 psi | 77% | 1644 fps | 87.1% |
| ADI AP 100*² | <<locked>> | 60% | 17,738 psi | 48% | 1332 fps | 92.3% |
| ADI APS 350² | <<locked>> | 60% | 30,037 psi | 81% | 1316 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,543 psi | 77% | 1325 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,805 psi | 78% | 1371 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,818 psi | 73% | 1421 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,772 psi | 64% | 1532 fps | 86.9% |
| Alliant Green Dot² | <<locked>> | 60% | 28,616 psi | 77% | 1421 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 19,377 psi | 52% | 1339 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 26,150 psi | 71% | 1588 fps | 96.9% |
| Alliant RED DOT² | <<locked>> | 60% | 27,876 psi | 75% | 1378 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 26,643 psi | 72% | 1506 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,108 psi | 76% | 1401 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,869 psi | 51% | 1237 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,410 psi | 66% | 1250 fps | 100% |
| Hodgdon TrailBoss² | 5.3 gr | 60% | 9,616 psi | 26% | 922 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 27,891 psi | 75% | 1644 fps | 91% |
| Maxam CSB 1² | <<locked>> | 60% | 24,163 psi | 65% | 1378 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 27,079 psi | 73% | 1427 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 27,383 psi | 74% | 1414 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,921 psi | 78% | 1417 fps | 100% |
| ReloadSwiss RS 14² | 5.4 gr | 60% | 9,079 psi | 25% | 925 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 25,411 psi | 69% | 1476 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 23,801 psi | 64% | 1532 fps | 90.6% |
| Rottweil P 806² | <<locked>> | 60% | 21,016 psi | 57% | 1476 fps | 98.3% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 27,891 psi | 75% | 1644 fps | 91% |
| SNPE Vectan A0² | <<locked>> | 60% | 24,366 psi | 66% | 1421 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 29,443 psi | 80% | 1460 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,718 psi | 78% | 1473 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 21,074 psi | 57% | 1398 fps | 98.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 28,587 psi | 77% | 1473 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 27,209 psi | 74% | 1486 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 25,034 psi | 68% | 1509 fps | 99.9% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 17,085 psi | 46% | 1335 fps | 85.3% |
| Vihtavuori N105*² | <<locked>> | 60% | 14,170 psi | 38% | 1286 fps | 85.5% |
| Vihtavuori N32C Tin Star² | 7.1 gr | 60% | 15,998 psi | 43% | 1093 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,774 psi | 72% | 1483 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 21,828 psi | 59% | 1434 fps | 99.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 25,527 psi | 69% | 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 44 powders for .357 Auto Mag. loaded with the .356 | 122gr | Rim Rock TC Top Shelf. Vihtavuori N105 delivers the highest muzzle velocity at 1,749 fps; across all powders the maximum-charge window runs from 1,224 fps to 1,749 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 44 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 52–90 %, 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 .356 | 122gr | Rim Rock TC Top Shelf 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.