Load Specifications
Load data in caliber .357 Mag. with .356 | 123gr | LOS HP bullet and 63 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ADI AP 100, SNPE Vectan BA7 1/2 and Alliant Herco.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 72% | 35,041 psi | 81% | 1447 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 37,913 psi | 87% | 1637 fps | 91.7% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,768 psi | 87% | 1378 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,681 psi | 87% | 1437 fps | 100% |
| ADI AP 100 | <<locked>> | 96% | 36,709 psi | 84% | 1565 fps | 98.4% |
| ADI AP 70N² | <<locked>> | 64% | 35,737 psi | 82% | 1424 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 39,030 psi | 90% | 1280 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,144 psi | 85% | 1293 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 37,434 psi | 86% | 1339 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 36,695 psi | 84% | 1378 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 38,711 psi | 89% | 1434 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 36,201 psi | 83% | 1598 fps | 89.8% |
| Alliant BULLSEYE² | <<locked>> | 72% | 38,305 psi | 88% | 1526 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,999 psi | 85% | 1385 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 38,841 psi | 89% | 1529 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 38,290 psi | 88% | 1637 fps | 98.3% |
| Alliant RED DOT | <<locked>> | 80% | 39,131 psi | 90% | 1378 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 35,694 psi | 82% | 1493 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,695 psi | 87% | 1519 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 36,869 psi | 85% | 1368 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 38,189 psi | 88% | 1394 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,840 psi | 87% | 1398 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 36,042 psi | 83% | 1257 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 35,447 psi | 81% | 1522 fps | 99.8% |
| Hodgdon Longshot² | <<locked>> | 64% | 39,146 psi | 90% | 1572 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,449 psi | 42% | 1043 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 36,521 psi | 84% | 1434 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 37,913 psi | 87% | 1637 fps | 91.7% |
| Lovex S011² | <<locked>> | 64% | 35,679 psi | 82% | 1385 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 36,709 psi | 84% | 1460 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 38,000 psi | 87% | 1434 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 38,537 psi | 89% | 1440 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 39,030 psi | 90% | 1424 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,478 psi | 86% | 1381 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 38,159 psi | 88% | 1335 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 35,056 psi | 81% | 1486 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,797 psi | 87% | 1411 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,318 psi | 40% | 1053 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 36,506 psi | 84% | 1496 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 80% | 35,534 psi | 82% | 1588 fps | 93% |
| Rottweil P 801² | <<locked>> | 64% | 37,101 psi | 85% | 1368 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 35,708 psi | 82% | 1611 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 37,913 psi | 87% | 1637 fps | 91.7% |
| SNPE Vectan A0 | <<locked>> | 84% | 38,101 psi | 88% | 1476 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 38,798 psi | 89% | 1434 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 37,797 psi | 87% | 1444 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,899 psi | 89% | 1312 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,217 psi | 86% | 1529 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 37,420 psi | 86% | 1444 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 39,262 psi | 90% | 1654 fps | 99.4% |
| Somchem MP200² | <<locked>> | 72% | 35,534 psi | 82% | 1483 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,783 psi | 89% | 1499 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 36,550 psi | 84% | 1575 fps | 96.1% |
| Vihtavuori 3N37 | <<locked>> | 80% | 37,014 psi | 85% | 1549 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 92% | 36,318 psi | 83% | 1585 fps | 94.1% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 36,970 psi | 85% | 1657 fps | 97.8% |
| Vihtavuori N320² | <<locked>> | 72% | 36,651 psi | 84% | 1375 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 38,058 psi | 87% | 1306 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 39,175 psi | 90% | 1470 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 39,131 psi | 90% | 1506 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 37,666 psi | 87% | 1555 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 38,116 psi | 88% | 1430 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 36,666 psi | 84% | 1440 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% | 24,845 psi | 57% | 1286 fps | 99.9% |
| Accurate No. 7*² | <<locked>> | 68% | 29,414 psi | 68% | 1490 fps | 87.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,295 psi | 58% | 1201 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,350 psi | 51% | 1207 fps | 100% |
| ADI AP 100*² | 7.6 gr | 64% | 16,795 psi | 39% | 1148 fps | 87.1% |
| ADI AP 70N² | <<locked>> | 60% | 31,865 psi | 73% | 1371 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,731 psi | 64% | 1132 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,092 psi | 60% | 1142 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,382 psi | 58% | 1168 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,282 psi | 63% | 1243 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 23,351 psi | 54% | 1214 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 29,834 psi | 69% | 1483 fps | 86.3% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,210 psi | 65% | 1371 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,570 psi | 59% | 1217 fps | 100% |
| Alliant Herco² | 6.5 gr | 60% | 17,085 psi | 39% | 1132 fps | 99.2% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,480 psi | 49% | 1306 fps | 90.5% |
| Alliant RED DOT² | <<locked>> | 60% | 25,208 psi | 58% | 1181 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,879 psi | 73% | 1437 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,902 psi | 53% | 1273 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,787 psi | 57% | 1198 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,650 psi | 38% | 1056 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,789 psi | 62% | 1253 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 28,181 psi | 65% | 1148 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,893 psi | 71% | 1450 fps | 99.1% |
| Hodgdon Longshot² | <<locked>> | 60% | 34,229 psi | 79% | 1499 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,398 psi | 22% | 794 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,992 psi | 62% | 1296 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 29,414 psi | 68% | 1490 fps | 87.4% |
| Lovex S011² | <<locked>> | 60% | 31,604 psi | 73% | 1329 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,179 psi | 60% | 1306 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,943 psi | 48% | 1171 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,308 psi | 54% | 1220 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 24,062 psi | 55% | 1211 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,817 psi | 59% | 1217 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,065 psi | 65% | 1201 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,922 psi | 71% | 1424 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,950 psi | 69% | 1306 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 9,137 psi | 21% | 801 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,639 psi | 47% | 1237 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 24,743 psi | 57% | 1381 fps | 86.9% |
| Rottweil P 801² | <<locked>> | 60% | 33,910 psi | 78% | 1329 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 16,926 psi | 39% | 1227 fps | 92.7% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 29,414 psi | 68% | 1490 fps | 87.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,726 psi | 48% | 1191 fps | 99.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,715 psi | 59% | 1250 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,903 psi | 57% | 1253 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,037 psi | 67% | 1184 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7.6 gr | 60% | 18,188 psi | 42% | 1168 fps | 94.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,758 psi | 57% | 1253 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 24,047 psi | 55% | 1381 fps | 94.4% |
| Somchem MP200² | <<locked>> | 60% | 25,556 psi | 59% | 1319 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,569 psi | 54% | 1260 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 28,355 psi | 65% | 1434 fps | 92.6% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,784 psi | 48% | 1257 fps | 97.1% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 23,728 psi | 55% | 1352 fps | 87.2% |
| Vihtavuori N105*² | <<locked>> | 76% | 18,855 psi | 43% | 1289 fps | 86.9% |
| Vihtavuori N320² | <<locked>> | 60% | 26,847 psi | 62% | 1240 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 16,882 psi | 39% | 991 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,179 psi | 58% | 1273 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,742 psi | 52% | 1253 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 18,826 psi | 43% | 1207 fps | 96.2% |
| Winchester 231² | <<locked>> | 60% | 33,460 psi | 77% | 1371 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 22,118 psi | 51% | 1214 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 HP. Vihtavuori N105 delivers the highest muzzle velocity at 1,657 fps; across all powders the maximum-charge window runs from 1,043 fps to 1,657 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 27 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. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N105 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. ADI AP 100, SNPE Vectan BA7 1/2, Alliant Herco rank at the top here: for .357 Mag. with the .356 | 123gr | LOS HP 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. Baschieri & Pellagri 102 Pistol, 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.