Load Specifications
Load data in caliber .357 Mag. with .356 | 123gr | LOS 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 Rottweil P 806, Vihtavuori N350 and ADI AP 100.
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% | 38,232 psi | 88% | 1476 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 37,043 psi | 85% | 1611 fps | 90.9% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,057 psi | 85% | 1358 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 36,245 psi | 83% | 1411 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 39,044 psi | 90% | 1588 fps | 98.7% |
| ADI AP 70N² | <<locked>> | 68% | 38,392 psi | 88% | 1450 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,101 psi | 88% | 1257 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,289 psi | 86% | 1283 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 39,291 psi | 90% | 1348 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 35,882 psi | 82% | 1358 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 38,551 psi | 89% | 1424 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 38,667 psi | 89% | 1624 fps | 90.5% |
| Alliant BULLSEYE² | <<locked>> | 72% | 37,724 psi | 87% | 1506 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,245 psi | 83% | 1365 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 37,956 psi | 87% | 1509 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 36,709 psi | 84% | 1601 fps | 97.7% |
| Alliant RED DOT | <<locked>> | 80% | 38,174 psi | 88% | 1358 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 38,450 psi | 88% | 1522 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 36,376 psi | 84% | 1493 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 36,201 psi | 83% | 1352 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 37,159 psi | 85% | 1375 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,202 psi | 86% | 1381 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 39,305 psi | 90% | 1306 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 39,001 psi | 90% | 1565 fps | 99.9% |
| Hodgdon Longshot² | <<locked>> | 64% | 38,435 psi | 88% | 1549 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,202 psi | 42% | 1033 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 39,204 psi | 90% | 1460 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 37,043 psi | 85% | 1611 fps | 90.9% |
| Lovex S011² | <<locked>> | 68% | 38,595 psi | 89% | 1411 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 36,201 psi | 83% | 1444 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 36,637 psi | 84% | 1411 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 37,898 psi | 87% | 1424 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 37,565 psi | 86% | 1398 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 36,709 psi | 84% | 1365 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,260 psi | 86% | 1316 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 38,566 psi | 89% | 1522 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 36,143 psi | 83% | 1381 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,071 psi | 39% | 1043 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 38,580 psi | 89% | 1512 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 38,551 psi | 89% | 1621 fps | 93.9% |
| Rottweil P 801² | <<locked>> | 64% | 36,332 psi | 84% | 1352 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 38,914 psi | 89% | 1647 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 37,043 psi | 85% | 1611 fps | 90.9% |
| SNPE Vectan A0 | <<locked>> | 84% | 37,028 psi | 85% | 1457 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 37,710 psi | 87% | 1411 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 36,753 psi | 84% | 1421 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,203 psi | 88% | 1296 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 36,521 psi | 84% | 1509 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 36,085 psi | 83% | 1417 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 37,666 psi | 87% | 1621 fps | 99% |
| Somchem MP200² | <<locked>> | 76% | 39,059 psi | 90% | 1519 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,363 psi | 88% | 1486 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 36,100 psi | 83% | 1558 fps | 95.7% |
| Vihtavuori 3N37 | <<locked>> | 80% | 36,027 psi | 83% | 1526 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 96% | 36,695 psi | 84% | 1581 fps | 93.9% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 35,636 psi | 82% | 1627 fps | 97.2% |
| Vihtavuori N320² | <<locked>> | 72% | 36,143 psi | 83% | 1358 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,401 psi | 74% | 1234 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 35,375 psi | 81% | 1414 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 38,043 psi | 87% | 1480 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 38,479 psi | 88% | 1549 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 36,811 psi | 85% | 1407 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 35,810 psi | 82% | 1421 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% | 24,076 psi | 55% | 1263 fps | 99.8% |
| Accurate No. 7*² | <<locked>> | 68% | 27,818 psi | 64% | 1450 fps | 85.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 24,990 psi | 57% | 1188 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,495 psi | 49% | 1181 fps | 100% |
| ADI AP 100*² | 7.3 gr | 64% | 16,360 psi | 38% | 1129 fps | 86.3% |
| ADI AP 70N² | <<locked>> | 60% | 31,154 psi | 72% | 1352 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,369 psi | 63% | 1115 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 25,846 psi | 59% | 1129 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,063 psi | 58% | 1155 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,035 psi | 62% | 1230 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,727 psi | 52% | 1198 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 28,863 psi | 66% | 1453 fps | 85.2% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,398 psi | 63% | 1348 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,627 psi | 57% | 1194 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,520 psi | 38% | 1109 fps | 98.8% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,031 psi | 48% | 1286 fps | 89.8% |
| Alliant RED DOT² | <<locked>> | 60% | 24,076 psi | 55% | 1155 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 30,472 psi | 70% | 1404 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,147 psi | 51% | 1250 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 23,902 psi | 55% | 1175 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,012 psi | 37% | 1037 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 25,962 psi | 60% | 1234 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,046 psi | 51% | 1063 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,081 psi | 69% | 1427 fps | 98.8% |
| Hodgdon Longshot² | <<locked>> | 60% | 33,417 psi | 77% | 1476 fps | 99.9% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,050 psi | 21% | 774 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,194 psi | 60% | 1273 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 27,818 psi | 64% | 1450 fps | 85.9% |
| Lovex S011² | <<locked>> | 60% | 30,763 psi | 71% | 1309 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,411 psi | 58% | 1283 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,711 psi | 48% | 1161 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 22,379 psi | 51% | 1198 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,148 psi | 53% | 1184 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 24,787 psi | 57% | 1194 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,731 psi | 64% | 1188 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 29,878 psi | 69% | 1398 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,747 psi | 68% | 1296 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 8,818 psi | 20% | 784 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,465 psi | 47% | 1227 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 24,018 psi | 55% | 1355 fps | 85.8% |
| Rottweil P 801² | <<locked>> | 60% | 33,141 psi | 76% | 1309 fps | 100% |
| Rottweil P 806*² | 9.9 gr | 60% | 15,954 psi | 37% | 1194 fps | 91.3% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 27,818 psi | 64% | 1450 fps | 85.9% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,595 psi | 47% | 1181 fps | 99.8% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,135 psi | 58% | 1230 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,250 psi | 56% | 1234 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,906 psi | 66% | 1175 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 17,738 psi | 41% | 1145 fps | 93.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 23,975 psi | 55% | 1234 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 23,018 psi | 53% | 1348 fps | 93.4% |
| Somchem MP200² | <<locked>> | 60% | 24,990 psi | 57% | 1302 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,931 psi | 53% | 1240 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 27,717 psi | 64% | 1407 fps | 91.9% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,320 psi | 47% | 1237 fps | 96.5% |
| Vihtavuori 3N38* | <<locked>> | 80% | 24,149 psi | 56% | 1352 fps | 87% |
| Vihtavuori N105*² | <<locked>> | 76% | 18,231 psi | 42% | 1263 fps | 85.7% |
| Vihtavuori N320² | <<locked>> | 60% | 26,136 psi | 60% | 1224 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,315 psi | 33% | 925 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,353 psi | 58% | 1270 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,278 psi | 51% | 1234 fps | 100% |
| Vihtavuori N350² | 7.1 gr | 60% | 17,535 psi | 40% | 1165 fps | 95% |
| Winchester 231² | <<locked>> | 60% | 32,793 psi | 75% | 1355 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,582 psi | 50% | 1194 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 RN. Rottweil P 806 delivers the highest muzzle velocity at 1,647 fps; across all powders the maximum-charge window runs from 1,033 fps to 1,647 fps. ADI AP 100 gives the best case fill at 100 %, and 29 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. ADI AP 100, Alliant BLUE DOT, Hodgdon TrailBoss 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, Vihtavuori N350, ADI AP 100 rank at the top here: for .357 Mag. with the .356 | 123gr | LOS 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 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.