Load Specifications
Load data in caliber .357 Mag. with .356 | 125gr | Rim Rock CN bullet and 69 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Rottweil P 806, SNPE Vectan BA7 1/2 and Vihtavuori N350.
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"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 76% | 36,912 psi | 85% | 1444 fps | 100% |
| Accurate No. 5² | <<locked>> | 64% | 38,174 psi | 88% | 1558 fps | 99.3% |
| Accurate No. 7* | <<locked>> | 80% | 38,377 psi | 88% | 1614 fps | 91.3% |
| Accurate Solo 1000 | <<locked>> | 80% | 38,406 psi | 88% | 1358 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 84% | 37,376 psi | 86% | 1411 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 36,709 psi | 84% | 1539 fps | 98.1% |
| ADI AP 70N² | <<locked>> | 68% | 35,302 psi | 81% | 1401 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 36,637 psi | 84% | 1224 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 38,914 psi | 89% | 1286 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 37,333 psi | 86% | 1312 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 37,536 psi | 86% | 1365 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 35,331 psi | 81% | 1371 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 35,027 psi | 81% | 1552 fps | 88.6% |
| Alliant BULLSEYE² | <<locked>> | 72% | 35,346 psi | 81% | 1460 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 36,970 psi | 85% | 1365 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 37,956 psi | 87% | 1496 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 84% | 37,884 psi | 87% | 1604 fps | 97.9% |
| Alliant RED DOT | <<locked>> | 84% | 39,001 psi | 90% | 1358 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 36,274 psi | 83% | 1476 fps | 100% |
| Alliant UNIQUE | <<locked>> | 84% | 36,999 psi | 85% | 1490 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 37,304 psi | 86% | 1352 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 38,392 psi | 88% | 1375 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 38,377 psi | 88% | 1381 fps | 100% |
| Hodgdon CFE Pistol | <<locked>> | 80% | 38,290 psi | 88% | 1434 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 37,231 psi | 86% | 1263 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 36,477 psi | 84% | 1516 fps | 99.8% |
| Hodgdon Longshot² | <<locked>> | 64% | 35,810 psi | 82% | 1496 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 15,867 psi | 36% | 991 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 36,172 psi | 83% | 1414 fps | 100% |
| Lovex D036² | <<locked>> | 64% | 38,130 psi | 88% | 1558 fps | 99.3% |
| Lovex D037.1* | <<locked>> | 80% | 38,377 psi | 88% | 1614 fps | 91.3% |
| Lovex S011² | <<locked>> | 68% | 37,260 psi | 86% | 1378 fps | 100% |
| Lovex S020² | <<locked>> | 76% | 37,086 psi | 85% | 1444 fps | 100% |
| Maxam CSB 1 | <<locked>> | 88% | 37,753 psi | 87% | 1411 fps | 100% |
| Maxam CSB 2 | <<locked>> | 84% | 38,261 psi | 88% | 1421 fps | 100% |
| Maxam CSB 3 | <<locked>> | 84% | 38,725 psi | 89% | 1394 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 37,840 psi | 87% | 1365 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 38,392 psi | 88% | 1316 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 35,737 psi | 82% | 1470 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 37,043 psi | 85% | 1509 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 72% | 37,072 psi | 85% | 1388 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 14,489 psi | 33% | 994 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 36,216 psi | 83% | 1473 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 35,418 psi | 81% | 1558 fps | 92.5% |
| Rottweil P 801² | <<locked>> | 68% | 37,434 psi | 86% | 1355 fps | 100% |
| Rottweil P 806 | <<locked>> | 92% | 38,537 psi | 89% | 1631 fps | 100% |
| Shooters World Auto Pistol² | <<locked>> | 64% | 38,130 psi | 88% | 1558 fps | 99.3% |
| Shooters World Major Pistol* | <<locked>> | 80% | 38,377 psi | 88% | 1614 fps | 91.3% |
| SNPE Vectan A0 | <<locked>> | 88% | 38,334 psi | 88% | 1457 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 35,795 psi | 82% | 1371 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 39,059 psi | 90% | 1430 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 37,014 psi | 85% | 1263 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 92% | 37,057 psi | 85% | 1499 fps | 100% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 37,913 psi | 87% | 1427 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 80% | 39,088 psi | 90% | 1631 fps | 99.2% |
| Somchem MP200² | <<locked>> | 76% | 35,911 psi | 83% | 1467 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 35,230 psi | 81% | 1430 fps | 100% |
| Somchem S221² | <<locked>> | 72% | 37,536 psi | 86% | 1565 fps | 96% |
| Vihtavuori 3N37 | <<locked>> | 84% | 37,173 psi | 85% | 1526 fps | 100% |
| Vihtavuori 3N38*ᴾ | <<locked>> | 100% | 37,318 psi | 86% | 1575 fps | 94% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 31,314 psi | 72% | 1545 fps | 95.5% |
| Vihtavuori N310² | <<locked>> | 64% | 39,059 psi | 90% | 1286 fps | 100% |
| Vihtavuori N320² | <<locked>> | 76% | 38,014 psi | 87% | 1368 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 29,501 psi | 68% | 1191 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 37,130 psi | 85% | 1424 fps | 100% |
| Vihtavuori N340 | <<locked>> | 84% | 39,291 psi | 90% | 1480 fps | 100% |
| Vihtavuori N350 | <<locked>> | 92% | 39,175 psi | 90% | 1545 fps | 100% |
| Winchester 231² | <<locked>> | 68% | 38,856 psi | 89% | 1417 fps | 100% |
| Winchester AutoComp | <<locked>> | 84% | 36,521 psi | 84% | 1417 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 22,249 psi | 51% | 1217 fps | 99.4% |
| Accurate No. 5² | <<locked>> | 60% | 33,460 psi | 77% | 1490 fps | 98.4% |
| Accurate No. 7*² | <<locked>> | 72% | 28,558 psi | 66% | 1453 fps | 86.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 23,105 psi | 53% | 1145 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 19,986 psi | 46% | 1148 fps | 100% |
| ADI AP 100*² | <<locked>> | 68% | 16,201 psi | 37% | 1122 fps | 85.9% |
| ADI AP 70N² | <<locked>> | 60% | 27,978 psi | 64% | 1299 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 25,498 psi | 59% | 1079 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 24,149 psi | 56% | 1093 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 23,453 psi | 54% | 1122 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 24,758 psi | 57% | 1188 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 20,088 psi | 46% | 1145 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 31,676 psi | 73% | 1496 fps | 86.9% |
| Alliant BULLSEYE² | <<locked>> | 60% | 25,585 psi | 59% | 1306 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 23,003 psi | 53% | 1161 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 14,315 psi | 33% | 1050 fps | 97.3% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 18,666 psi | 43% | 1220 fps | 87.4% |
| Alliant RED DOT² | <<locked>> | 60% | 22,292 psi | 51% | 1122 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 28,805 psi | 66% | 1365 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 19,783 psi | 45% | 1198 fps | 99.7% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 22,437 psi | 52% | 1145 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 14,228 psi | 33% | 1001 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 23,685 psi | 54% | 1191 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 22,104 psi | 51% | 1198 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 20,204 psi | 46% | 1024 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 28,065 psi | 65% | 1381 fps | 98.1% |
| Hodgdon Longshot² | <<locked>> | 60% | 30,632 psi | 70% | 1421 fps | 99.6% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,382 psi | 17% | 738 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 23,685 psi | 54% | 1227 fps | 100% |
| Lovex D036² | <<locked>> | 60% | 33,446 psi | 77% | 1490 fps | 98.4% |
| Lovex D037.1*² | <<locked>> | 72% | 28,558 psi | 66% | 1453 fps | 86.2% |
| Lovex S011² | <<locked>> | 60% | 29,095 psi | 67% | 1273 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 23,134 psi | 53% | 1237 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 18,579 psi | 43% | 1115 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 20,160 psi | 46% | 1158 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 21,669 psi | 50% | 1152 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 23,424 psi | 54% | 1165 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 25,556 psi | 59% | 1148 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 27,630 psi | 64% | 1352 fps | 100% |
| Ramshot True Blue² | <<locked>> | 60% | 31,778 psi | 73% | 1434 fps | 99.7% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 26,107 psi | 60% | 1240 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,034 psi | 16% | 738 fps | 98.4% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 17,767 psi | 41% | 1165 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 24,569 psi | 56% | 1358 fps | 86.1% |
| Rottweil P 801² | <<locked>> | 60% | 29,733 psi | 68% | 1260 fps | 100% |
| Rottweil P 806*² | 9.5 gr | 60% | 12,923 psi | 30% | 1109 fps | 87.2% |
| Shooters World Auto Pistol² | <<locked>> | 60% | 33,446 psi | 77% | 1490 fps | 98.4% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 28,558 psi | 66% | 1453 fps | 86.2% |
| SNPE Vectan A0² | <<locked>> | 60% | 18,753 psi | 43% | 1135 fps | 99.4% |
| SNPE Vectan A1² | <<locked>> | 60% | 23,467 psi | 54% | 1194 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 22,640 psi | 52% | 1198 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 27,311 psi | 63% | 1138 fps | 100% |
| SNPE Vectan BA7 1/2*² | 6.9 gr | 60% | 15,563 psi | 36% | 1086 fps | 91.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 21,886 psi | 50% | 1188 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 20,117 psi | 46% | 1280 fps | 91.1% |
| Somchem MP200² | <<locked>> | 60% | 22,989 psi | 53% | 1257 fps | 99.9% |
| Somchem MS200² | <<locked>> | 60% | 20,871 psi | 48% | 1194 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 24,772 psi | 57% | 1342 fps | 89.9% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 17,883 psi | 41% | 1175 fps | 94.7% |
| Vihtavuori 3N38* | <<locked>> | 84% | 24,004 psi | 55% | 1342 fps | 86.8% |
| Vihtavuori N105* | <<locked>> | 84% | 19,812 psi | 46% | 1302 fps | 87.4% |
| Vihtavuori N310² | <<locked>> | 60% | 35,839 psi | 82% | 1250 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 24,497 psi | 56% | 1191 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 12,183 psi | 28% | 886 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 23,003 psi | 53% | 1224 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 20,146 psi | 46% | 1184 fps | 99.9% |
| Vihtavuori N350*² | 6.8 gr | 60% | 15,548 psi | 36% | 1109 fps | 93% |
| Winchester 231² | <<locked>> | 60% | 31,096 psi | 71% | 1319 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 19,450 psi | 45% | 1152 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 25 powders for .357 Mag. loaded with the .356 | 125gr | Rim Rock CN. Rottweil P 806 delivers the highest muzzle velocity at 1,631 fps; across all powders the maximum-charge window runs from 991 fps to 1,631 fps. ADI AP 100 gives the best case fill at 100 %, and 25 of the 25 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 33–90 %, leaving at least 10 % headroom. ADI AP 100, Alliant Herco, Baschieri & Pellagri 102 Pistol 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. Rottweil P 806, SNPE Vectan BA7 1/2, Vihtavuori N350 rank at the top here: for .357 Mag. with the .356 | 125gr | Rim Rock CN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ReloadSwiss RS 24, Vihtavuori 3N38 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.