Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 100gr | Rim Rock FP Top Shelf bullet and 51 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N105, Vihtavuori N32C Tin Star and ReloadSwiss RS 14.
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% | 30,647 psi | 83% | 1742 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 29,588 psi | 80% | 1850 fps | 88.9% |
| Accurate Solo 1000² | <<locked>> | 64% | 30,342 psi | 82% | 1614 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 30,560 psi | 83% | 1686 fps | 100% |
| ADI AP 100 | <<locked>> | 84% | 31,531 psi | 85% | 1847 fps | 97.8% |
| ADI APS 350² | <<locked>> | 64% | 31,720 psi | 86% | 1512 fps | 100% |
| ADI APS 450² | <<locked>> | 68% | 33,344 psi | 90% | 1578 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 32,953 psi | 89% | 1621 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 32,576 psi | 88% | 1670 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 31,459 psi | 85% | 1680 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 30,705 psi | 83% | 1864 fps | 88.4% |
| Alliant Green Dot² | <<locked>> | 68% | 33,214 psi | 90% | 1683 fps | 100% |
| Alliant Herco | <<locked>> | 84% | 33,272 psi | 90% | 1811 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 30,705 psi | 83% | 1877 fps | 96.7% |
| Alliant RED DOT² | <<locked>> | 68% | 32,082 psi | 87% | 1631 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 30,676 psi | 83% | 1775 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 33,431 psi | 90% | 1673 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 32,213 psi | 87% | 1654 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 33,185 psi | 90% | 1677 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 30,472 psi | 82% | 1526 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,232 psi | 52% | 1342 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 32,169 psi | 87% | 1729 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 29,588 psi | 80% | 1850 fps | 88.9% |
| Lovex S020² | <<locked>> | 64% | 32,518 psi | 88% | 1759 fps | 100% |
| Maxam CSB 1² | <<locked>> | 72% | 31,401 psi | 85% | 1696 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 31,662 psi | 86% | 1693 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 31,560 psi | 85% | 1670 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 30,429 psi | 82% | 1627 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 33,243 psi | 90% | 1614 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,941 psi | 49% | 1352 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 72% | 33,388 psi | 90% | 1811 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 32,474 psi | 88% | 1909 fps | 93% |
| Rottweil P 806² | <<locked>> | 76% | 33,069 psi | 89% | 1919 fps | 99.9% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 29,588 psi | 80% | 1850 fps | 88.9% |
| SNPE Vectan A0² | <<locked>> | 72% | 31,763 psi | 86% | 1745 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 31,241 psi | 84% | 1673 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 30,458 psi | 82% | 1686 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 31,082 psi | 84% | 1795 fps | 99.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 30,168 psi | 82% | 1686 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 30,995 psi | 84% | 1883 fps | 98.1% |
| Somchem MP200² | <<locked>> | 64% | 31,618 psi | 85% | 1781 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 31,821 psi | 86% | 1759 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 29,689 psi | 80% | 1788 fps | 99.9% |
| Vihtavuori 3N38* | <<locked>> | 84% | 32,213 psi | 87% | 1886 fps | 93.7% |
| Vihtavuori N105 | <<locked>> | 88% | 32,387 psi | 88% | 1949 fps | 97.1% |
| Vihtavuori N320² | <<locked>> | 64% | 32,924 psi | 89% | 1670 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 32,619 psi | 88% | 1568 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 32,285 psi | 87% | 1729 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 31,821 psi | 86% | 1762 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 32,663 psi | 88% | 1841 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 72% | 33,112 psi | 90% | 1742 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% | 27,050 psi | 73% | 1670 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 25,338 psi | 69% | 1742 fps | 85.8% |
| Accurate Solo 1000² | <<locked>> | 60% | 27,369 psi | 74% | 1558 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 24,033 psi | 65% | 1558 fps | 100% |
| ADI AP 100*² | <<locked>> | 60% | 16,331 psi | 44% | 1427 fps | 87.5% |
| ADI APS 350² | <<locked>> | 60% | 28,485 psi | 77% | 1457 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 27,789 psi | 75% | 1480 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,267 psi | 74% | 1519 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 29,486 psi | 80% | 1614 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 25,063 psi | 68% | 1562 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 27,470 psi | 74% | 1785 fps | 86.2% |
| Alliant Green Dot² | <<locked>> | 60% | 27,195 psi | 74% | 1575 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 17,883 psi | 48% | 1450 fps | 99.6% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 24,047 psi | 65% | 1706 fps | 93.2% |
| Alliant RED DOT² | <<locked>> | 60% | 26,382 psi | 71% | 1526 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 24,511 psi | 66% | 1640 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 26,411 psi | 71% | 1549 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,245 psi | 47% | 1348 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 29,138 psi | 79% | 1608 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,989 psi | 62% | 1381 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,862 psi | 24% | 1007 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 28,790 psi | 78% | 1667 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 25,338 psi | 69% | 1742 fps | 85.8% |
| Lovex S020² | <<locked>> | 60% | 28,964 psi | 78% | 1696 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 22,582 psi | 61% | 1516 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 25,063 psi | 68% | 1572 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 25,788 psi | 70% | 1562 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 27,441 psi | 74% | 1568 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 30,008 psi | 81% | 1558 fps | 100% |
| ReloadSwiss RS 14² | 5.7 gr | 60% | 8,340 psi | 23% | 1004 fps | 99.8% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 23,061 psi | 62% | 1604 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 21,727 psi | 59% | 1631 fps | 85.4% |
| Rottweil P 806*² | <<locked>> | 60% | 18,739 psi | 51% | 1565 fps | 94.5% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 25,338 psi | 69% | 1742 fps | 85.8% |
| SNPE Vectan A0² | <<locked>> | 60% | 22,931 psi | 62% | 1558 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 27,760 psi | 75% | 1608 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 26,948 psi | 73% | 1621 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 19,696 psi | 53% | 1512 fps | 96.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 26,556 psi | 72% | 1614 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 27,209 psi | 74% | 1795 fps | 96.7% |
| Somchem MP200² | <<locked>> | 60% | 28,065 psi | 76% | 1713 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 25,150 psi | 68% | 1621 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 23,061 psi | 62% | 1631 fps | 98.5% |
| Vihtavuori 3N38*² | <<locked>> | 72% | 22,698 psi | 61% | 1650 fps | 87.4% |
| Vihtavuori N105*² | 15.6 gr | 72% | 19,116 psi | 52% | 1604 fps | 88.1% |
| Vihtavuori N320² | <<locked>> | 60% | 29,182 psi | 79% | 1608 fps | 100% |
| Vihtavuori N32C Tin Star² | 7.6 gr | 60% | 15,055 psi | 41% | 1211 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 28,732 psi | 78% | 1667 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 24,976 psi | 68% | 1621 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 19,914 psi | 54% | 1542 fps | 97.3% |
| Winchester AutoComp ² | <<locked>> | 60% | 23,786 psi | 64% | 1562 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 51 powders for .357 Auto Mag. loaded with the .356 | 100gr | Rim Rock FP Top Shelf. Vihtavuori N105 delivers the highest muzzle velocity at 1,949 fps; across all powders the maximum-charge window runs from 1,342 fps to 1,949 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 49–90 %, 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 N105, Vihtavuori N32C Tin Star, ReloadSwiss RS 14 rank at the top here: for .357 Auto Mag. with the .356 | 100gr | Rim Rock FP Top Shelf they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Alliant BLUE DOT, Lovex D037.1 burn incompletely and react more sensitively to barrel length and temperature. 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.