Load Specifications
Load data in caliber .357 Mag. with .356 | 125gr | X-TREME RN bullet and 63 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N350, ADI AP 100 and SNPE Vectan BA7 1/2.
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% | 39,262 psi | 90% | 1473 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 36,753 psi | 84% | 1591 fps | 91% |
| Accurate Solo 1000² | <<locked>> | 76% | 36,898 psi | 85% | 1342 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 36,172 psi | 83% | 1394 fps | 100% |
| ADI AP 100 | <<locked>> | 96% | 36,347 psi | 84% | 1532 fps | 98.2% |
| ADI AP 70N² | <<locked>> | 68% | 38,319 psi | 88% | 1434 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,812 psi | 89% | 1250 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,086 psi | 85% | 1266 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 36,318 psi | 83% | 1299 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 36,666 psi | 84% | 1352 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 38,551 psi | 89% | 1407 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 38,435 psi | 88% | 1604 fps | 90.5% |
| Alliant BULLSEYE² | <<locked>> | 72% | 37,666 psi | 87% | 1490 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,114 psi | 83% | 1348 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 38,116 psi | 88% | 1493 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 36,883 psi | 85% | 1588 fps | 97.9% |
| Alliant RED DOT | <<locked>> | 80% | 38,014 psi | 87% | 1342 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 38,450 psi | 88% | 1503 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 36,448 psi | 84% | 1480 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 36,129 psi | 83% | 1335 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 37,289 psi | 86% | 1362 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,391 psi | 86% | 1371 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 39,189 psi | 90% | 1289 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 39,291 psi | 90% | 1552 fps | 100% |
| Hodgdon Longshot² | <<locked>> | 64% | 37,927 psi | 87% | 1526 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,057 psi | 42% | 1017 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 39,218 psi | 90% | 1444 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 36,753 psi | 84% | 1591 fps | 91% |
| Lovex S011² | <<locked>> | 64% | 34,896 psi | 80% | 1348 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 36,187 psi | 83% | 1427 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,507 psi | 86% | 1404 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 37,855 psi | 87% | 1407 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 37,550 psi | 86% | 1381 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 36,622 psi | 84% | 1348 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,014 psi | 85% | 1299 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 38,711 psi | 89% | 1506 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 36,941 psi | 85% | 1378 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,969 psi | 39% | 1027 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 38,725 psi | 89% | 1499 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 38,189 psi | 88% | 1601 fps | 93.9% |
| Rottweil P 801² | <<locked>> | 64% | 36,274 psi | 83% | 1335 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 38,609 psi | 89% | 1624 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 36,753 psi | 84% | 1591 fps | 91% |
| SNPE Vectan A0 | <<locked>> | 84% | 37,101 psi | 85% | 1440 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 37,753 psi | 87% | 1394 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 36,796 psi | 85% | 1404 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,043 psi | 87% | 1280 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 36,695 psi | 84% | 1496 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 36,898 psi | 85% | 1411 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 37,855 psi | 87% | 1608 fps | 99.1% |
| Somchem MP200² | <<locked>> | 76% | 39,189 psi | 90% | 1506 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,522 psi | 89% | 1470 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 35,665 psi | 82% | 1535 fps | 95.7% |
| Vihtavuori 3N37 | <<locked>> | 80% | 36,318 psi | 83% | 1512 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 96% | 37,202 psi | 86% | 1572 fps | 94.3% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 35,288 psi | 81% | 1608 fps | 97.2% |
| Vihtavuori N320² | <<locked>> | 72% | 36,999 psi | 85% | 1355 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,329 psi | 74% | 1217 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 35,375 psi | 81% | 1398 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 38,116 psi | 88% | 1467 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 37,898 psi | 87% | 1529 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 36,796 psi | 85% | 1391 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 35,810 psi | 82% | 1407 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% | 23,960 psi | 55% | 1247 fps | 99.8% |
| Accurate No. 7*² | <<locked>> | 68% | 28,065 psi | 65% | 1440 fps | 86.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 24,758 psi | 57% | 1168 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,930 psi | 50% | 1178 fps | 100% |
| ADI AP 100*² | 7.2 gr | 64% | 16,346 psi | 38% | 1115 fps | 86.5% |
| ADI AP 70N² | <<locked>> | 60% | 31,053 psi | 71% | 1335 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,006 psi | 62% | 1099 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 25,570 psi | 59% | 1112 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,527 psi | 59% | 1148 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 26,861 psi | 62% | 1214 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,655 psi | 52% | 1181 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 28,529 psi | 66% | 1434 fps | 85.2% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,296 psi | 63% | 1332 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,121 psi | 58% | 1188 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,839 psi | 39% | 1106 fps | 99% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,016 psi | 48% | 1273 fps | 90% |
| Alliant RED DOT² | <<locked>> | 60% | 24,526 psi | 56% | 1152 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,154 psi | 72% | 1401 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,060 psi | 51% | 1234 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,366 psi | 56% | 1171 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,331 psi | 38% | 1033 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 25,976 psi | 60% | 1220 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,741 psi | 50% | 1047 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,240 psi | 70% | 1414 fps | 98.9% |
| Hodgdon Longshot² | <<locked>> | 60% | 33,504 psi | 77% | 1463 fps | 99.9% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,181 psi | 21% | 771 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,049 psi | 60% | 1257 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 28,065 psi | 65% | 1440 fps | 86.3% |
| Lovex S011² | <<locked>> | 60% | 31,444 psi | 72% | 1302 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,338 psi | 58% | 1270 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,581 psi | 47% | 1145 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 22,887 psi | 53% | 1191 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,656 psi | 54% | 1181 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,338 psi | 58% | 1188 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,456 psi | 63% | 1171 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 29,907 psi | 69% | 1385 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,660 psi | 68% | 1280 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 8,934 psi | 21% | 781 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,378 psi | 47% | 1211 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 24,192 psi | 56% | 1345 fps | 86.2% |
| Rottweil P 801² | <<locked>> | 60% | 33,011 psi | 76% | 1293 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 16,070 psi | 37% | 1188 fps | 91.7% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 28,065 psi | 65% | 1440 fps | 86.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,494 psi | 47% | 1168 fps | 99.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,005 psi | 57% | 1214 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,192 psi | 56% | 1220 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,674 psi | 66% | 1158 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7.2 gr | 60% | 17,724 psi | 41% | 1135 fps | 93.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,453 psi | 56% | 1227 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 23,105 psi | 53% | 1339 fps | 93.7% |
| Somchem MP200² | <<locked>> | 60% | 24,932 psi | 57% | 1286 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,800 psi | 52% | 1224 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 27,847 psi | 64% | 1398 fps | 92.1% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,334 psi | 47% | 1224 fps | 96.7% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 21,901 psi | 50% | 1286 fps | 85.4% |
| Vihtavuori N105*² | <<locked>> | 76% | 17,941 psi | 41% | 1243 fps | 85.6% |
| Vihtavuori N320² | <<locked>> | 60% | 26,745 psi | 61% | 1217 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,591 psi | 34% | 922 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,237 psi | 58% | 1253 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,176 psi | 51% | 1217 fps | 100% |
| Vihtavuori N350² | 7.1 gr | 60% | 17,927 psi | 41% | 1165 fps | 95.4% |
| Winchester 231² | <<locked>> | 60% | 32,764 psi | 75% | 1339 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,480 psi | 49% | 1181 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 63 powders for .357 Mag. loaded with the .356 | 125gr | X-TREME RN. Rottweil P 806 delivers the highest muzzle velocity at 1,624 fps; across all powders the maximum-charge window runs from 1,017 fps to 1,624 fps. Alliant BLUE DOT gives the best case fill at 100 %, and 28 of the 63 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 39–90 %, leaving at least 10 % headroom. Alliant BLUE DOT, 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 N350, ADI AP 100, SNPE Vectan BA7 1/2 rank at the top here: for .357 Mag. with the .356 | 125gr | X-TREME RN 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. ADI AP 100, ADI APS 350, ADI APS 450 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.