Load Specifications
Load data in caliber .357 Mag. with .356 | 123gr | LOS FP 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% | 39,146 psi | 90% | 1493 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 37,289 psi | 86% | 1621 fps | 91.2% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,130 psi | 85% | 1365 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,057 psi | 85% | 1424 fps | 100% |
| ADI AP 100 | <<locked>> | 96% | 36,550 psi | 84% | 1555 fps | 98.2% |
| ADI AP 70N² | <<locked>> | 68% | 39,189 psi | 90% | 1463 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,247 psi | 88% | 1263 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,347 psi | 86% | 1289 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 36,622 psi | 84% | 1322 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 36,854 psi | 85% | 1375 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 38,392 psi | 88% | 1424 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 38,972 psi | 90% | 1634 fps | 90.8% |
| Alliant BULLSEYE² | <<locked>> | 72% | 38,624 psi | 89% | 1526 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,347 psi | 84% | 1371 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 38,551 psi | 89% | 1519 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 37,173 psi | 85% | 1614 fps | 97.9% |
| Alliant RED DOT | <<locked>> | 80% | 38,305 psi | 88% | 1365 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 39,262 psi | 90% | 1535 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,188 psi | 85% | 1509 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,101 psi | 85% | 1365 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 37,884 psi | 87% | 1385 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,652 psi | 87% | 1391 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 39,334 psi | 90% | 1309 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 35,215 psi | 81% | 1512 fps | 99.7% |
| Hodgdon Longshot² | <<locked>> | 64% | 38,928 psi | 89% | 1562 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,362 psi | 42% | 1037 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 39,189 psi | 90% | 1463 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 37,289 psi | 86% | 1621 fps | 91.2% |
| Lovex S011² | <<locked>> | 64% | 35,027 psi | 81% | 1368 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 36,230 psi | 83% | 1447 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,463 psi | 86% | 1424 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 37,985 psi | 87% | 1427 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 38,464 psi | 88% | 1411 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 36,782 psi | 85% | 1368 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,362 psi | 86% | 1322 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 39,146 psi | 90% | 1535 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,101 psi | 85% | 1398 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,231 psi | 40% | 1050 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 35,201 psi | 81% | 1476 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 38,899 psi | 89% | 1634 fps | 94.2% |
| Rottweil P 801² | <<locked>> | 64% | 37,275 psi | 86% | 1365 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 39,146 psi | 90% | 1654 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 37,289 psi | 86% | 1621 fps | 91.2% |
| SNPE Vectan A0 | <<locked>> | 84% | 37,681 psi | 87% | 1467 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 38,421 psi | 88% | 1424 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 37,405 psi | 86% | 1430 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,189 psi | 88% | 1299 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,028 psi | 85% | 1522 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 36,869 psi | 85% | 1430 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 38,247 psi | 88% | 1634 fps | 99.2% |
| Somchem MP200² | <<locked>> | 76% | 38,957 psi | 90% | 1522 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,334 psi | 88% | 1490 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 36,477 psi | 84% | 1568 fps | 95.9% |
| Vihtavuori 3N37 | <<locked>> | 80% | 36,637 psi | 84% | 1539 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 96% | 37,086 psi | 85% | 1594 fps | 94.3% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 36,056 psi | 83% | 1637 fps | 97.4% |
| Vihtavuori N320² | <<locked>> | 72% | 37,144 psi | 85% | 1375 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,445 psi | 75% | 1237 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 36,216 psi | 83% | 1430 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 38,783 psi | 89% | 1496 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 38,247 psi | 88% | 1552 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 37,652 psi | 87% | 1421 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 36,332 psi | 84% | 1430 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% | 24,236 psi | 56% | 1270 fps | 99.8% |
| Accurate No. 7*² | <<locked>> | 68% | 28,703 psi | 66% | 1473 fps | 86.7% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,193 psi | 58% | 1194 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,712 psi | 50% | 1188 fps | 100% |
| ADI AP 100*² | 7.5 gr | 64% | 16,824 psi | 39% | 1145 fps | 87% |
| ADI AP 70N² | <<locked>> | 60% | 31,299 psi | 72% | 1358 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,847 psi | 62% | 1112 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,063 psi | 60% | 1135 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,280 psi | 58% | 1161 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,282 psi | 63% | 1240 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,843 psi | 53% | 1201 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 29,182 psi | 67% | 1467 fps | 85.7% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,601 psi | 63% | 1355 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,845 psi | 57% | 1201 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,636 psi | 38% | 1115 fps | 98.9% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,103 psi | 49% | 1293 fps | 90% |
| Alliant RED DOT² | <<locked>> | 60% | 24,381 psi | 56% | 1165 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,285 psi | 72% | 1421 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,278 psi | 51% | 1257 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,062 psi | 55% | 1181 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,128 psi | 37% | 1043 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,469 psi | 61% | 1247 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,640 psi | 50% | 1060 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,560 psi | 70% | 1440 fps | 99% |
| Hodgdon Longshot² | <<locked>> | 60% | 33,910 psi | 78% | 1490 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,224 psi | 21% | 784 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,382 psi | 61% | 1280 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 28,703 psi | 66% | 1473 fps | 86.7% |
| Lovex S011² | <<locked>> | 60% | 31,676 psi | 73% | 1325 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,541 psi | 59% | 1289 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,856 psi | 48% | 1165 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,177 psi | 53% | 1214 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,337 psi | 54% | 1191 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,077 psi | 58% | 1201 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,992 psi | 64% | 1198 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,516 psi | 70% | 1411 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,921 psi | 69% | 1302 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 8,978 psi | 21% | 794 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,639 psi | 47% | 1234 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 24,497 psi | 56% | 1368 fps | 86.4% |
| Rottweil P 801² | <<locked>> | 60% | 33,243 psi | 76% | 1316 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 16,317 psi | 38% | 1207 fps | 91.8% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 28,703 psi | 66% | 1473 fps | 86.7% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,711 psi | 48% | 1188 fps | 99.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,179 psi | 58% | 1237 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,366 psi | 56% | 1240 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,109 psi | 67% | 1181 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7.4 gr | 60% | 17,811 psi | 41% | 1152 fps | 93.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,091 psi | 55% | 1237 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 23,569 psi | 54% | 1368 fps | 94% |
| Somchem MP200² | <<locked>> | 60% | 25,048 psi | 58% | 1306 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,018 psi | 53% | 1243 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 28,094 psi | 65% | 1421 fps | 92.3% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,407 psi | 47% | 1243 fps | 96.7% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 22,176 psi | 51% | 1312 fps | 85.6% |
| Vihtavuori N105*² | <<locked>> | 76% | 18,246 psi | 42% | 1266 fps | 85.9% |
| Vihtavuori N320² | <<locked>> | 60% | 26,397 psi | 61% | 1227 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,562 psi | 33% | 932 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,483 psi | 59% | 1273 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,423 psi | 52% | 1237 fps | 100% |
| Vihtavuori N350² | 7.3 gr | 60% | 18,086 psi | 42% | 1184 fps | 95.5% |
| Winchester 231² | <<locked>> | 60% | 33,649 psi | 77% | 1371 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,669 psi | 50% | 1201 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 | 123gr | LOS FP. Rottweil P 806 delivers the highest muzzle velocity at 1,654 fps; across all powders the maximum-charge window runs from 1,037 fps to 1,654 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 40–90 %, 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 | 123gr | LOS FP 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 APS 350, Alliant Herco, Baschieri & Pellagri 102 Pistol 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.