Load Specifications
Load data in caliber .357 Mag. with .355 | 124gr | Geco FMJ bullet and 67 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 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% | 36,419 psi | 84% | 1447 fps | 100% |
| Accurate No. 5² | <<locked>> | 64% | 38,508 psi | 89% | 1572 fps | 99.3% |
| Accurate No. 7* | <<locked>> | 80% | 38,508 psi | 89% | 1624 fps | 91.3% |
| Accurate Solo 1000 | <<locked>> | 80% | 38,014 psi | 87% | 1362 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 84% | 37,884 psi | 87% | 1424 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 36,956 psi | 85% | 1549 fps | 98.1% |
| ADI AP 70N² | <<locked>> | 68% | 35,795 psi | 82% | 1417 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 37,318 psi | 86% | 1237 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 38,551 psi | 89% | 1289 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 37,927 psi | 87% | 1329 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 37,115 psi | 85% | 1368 fps | 100% |
| Alliant BE-86 | <<locked>> | 84% | 39,189 psi | 90% | 1424 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 35,201 psi | 81% | 1562 fps | 88.6% |
| Alliant BULLSEYE² | <<locked>> | 72% | 35,824 psi | 82% | 1476 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 37,507 psi | 86% | 1378 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 38,247 psi | 88% | 1506 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 84% | 38,116 psi | 88% | 1617 fps | 98% |
| Alliant RED DOT | <<locked>> | 84% | 38,595 psi | 89% | 1362 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 36,724 psi | 84% | 1493 fps | 100% |
| Alliant UNIQUE | <<locked>> | 84% | 37,376 psi | 86% | 1503 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 37,840 psi | 87% | 1365 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 37,869 psi | 87% | 1378 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 38,624 psi | 89% | 1394 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 37,768 psi | 87% | 1276 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 36,782 psi | 85% | 1526 fps | 99.8% |
| Hodgdon Longshot² | <<locked>> | 64% | 35,317 psi | 81% | 1499 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 15,679 psi | 36% | 991 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 35,795 psi | 82% | 1417 fps | 100% |
| Lovex D036² | <<locked>> | 64% | 38,464 psi | 88% | 1572 fps | 99.3% |
| Lovex D037.1* | <<locked>> | 80% | 38,508 psi | 89% | 1624 fps | 91.3% |
| Lovex S011² | <<locked>> | 68% | 36,767 psi | 85% | 1378 fps | 100% |
| Lovex S020² | <<locked>> | 76% | 37,579 psi | 86% | 1457 fps | 100% |
| Maxam CSB 1 | <<locked>> | 88% | 38,174 psi | 88% | 1421 fps | 100% |
| Maxam CSB 2 | <<locked>> | 84% | 37,768 psi | 87% | 1421 fps | 100% |
| Maxam CSB 3 | <<locked>> | 84% | 39,233 psi | 90% | 1407 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 38,363 psi | 88% | 1378 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 38,986 psi | 90% | 1329 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 36,056 psi | 83% | 1483 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 36,535 psi | 84% | 1509 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 72% | 36,593 psi | 84% | 1391 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 14,344 psi | 33% | 994 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 35,737 psi | 82% | 1473 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 35,636 psi | 82% | 1572 fps | 92.5% |
| Rottweil P 801² | <<locked>> | 68% | 37,956 psi | 87% | 1368 fps | 100% |
| Rottweil P 806 | <<locked>> | 92% | 38,624 psi | 89% | 1640 fps | 100% |
| Shooters World Auto Pistol² | <<locked>> | 64% | 38,464 psi | 88% | 1572 fps | 99.3% |
| Shooters World Major Pistol* | <<locked>> | 80% | 38,508 psi | 89% | 1624 fps | 91.3% |
| SNPE Vectan A0 | <<locked>> | 88% | 38,740 psi | 89% | 1467 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 36,216 psi | 83% | 1385 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 38,566 psi | 89% | 1434 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 36,637 psi | 84% | 1266 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 92% | 37,318 psi | 86% | 1512 fps | 100% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 37,420 psi | 86% | 1427 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 80% | 38,537 psi | 89% | 1631 fps | 99.1% |
| Somchem MP200² | <<locked>> | 76% | 36,289 psi | 83% | 1476 fps | 100% |
| Somchem MS200 | <<locked>> | 84% | 39,088 psi | 90% | 1486 fps | 100% |
| Somchem S221² | <<locked>> | 72% | 36,970 psi | 85% | 1565 fps | 95.8% |
| Vihtavuori 3N37 | <<locked>> | 84% | 36,622 psi | 84% | 1526 fps | 100% |
| Vihtavuori 3N38*ᴾ | <<locked>> | 100% | 37,521 psi | 86% | 1585 fps | 94% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 31,473 psi | 72% | 1555 fps | 95.5% |
| Vihtavuori N320² | <<locked>> | 76% | 37,565 psi | 86% | 1371 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 29,167 psi | 67% | 1194 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 36,651 psi | 84% | 1427 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 35,998 psi | 83% | 1450 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 35,099 psi | 81% | 1499 fps | 100% |
| Winchester 231² | <<locked>> | 68% | 39,320 psi | 90% | 1430 fps | 100% |
| Winchester AutoComp | <<locked>> | 84% | 36,854 psi | 85% | 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% | 21,959 psi | 50% | 1217 fps | 99.3% |
| Accurate No. 5² | <<locked>> | 60% | 33,011 psi | 76% | 1490 fps | 98.2% |
| Accurate No. 7*² | <<locked>> | 72% | 28,747 psi | 66% | 1467 fps | 86.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 23,569 psi | 54% | 1161 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 19,783 psi | 45% | 1152 fps | 100% |
| ADI AP 100*² | <<locked>> | 68% | 16,012 psi | 37% | 1125 fps | 85.6% |
| ADI AP 70N² | <<locked>> | 60% | 28,413 psi | 65% | 1312 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,121 psi | 60% | 1093 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 24,685 psi | 57% | 1106 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 23,221 psi | 53% | 1125 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 24,511 psi | 56% | 1194 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 20,421 psi | 47% | 1158 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 31,865 psi | 73% | 1506 fps | 86.9% |
| Alliant BULLSEYE² | <<locked>> | 60% | 25,295 psi | 58% | 1309 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 22,771 psi | 52% | 1165 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 14,562 psi | 33% | 1063 fps | 97.5% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 18,942 psi | 44% | 1237 fps | 87.6% |
| Alliant RED DOT² | <<locked>> | 60% | 22,089 psi | 51% | 1125 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 28,471 psi | 65% | 1368 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 19,566 psi | 45% | 1198 fps | 99.6% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 22,162 psi | 51% | 1148 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 14,083 psi | 32% | 1004 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 23,975 psi | 55% | 1204 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 20,697 psi | 48% | 1040 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 27,673 psi | 64% | 1381 fps | 98% |
| Hodgdon Longshot² | <<locked>> | 60% | 30,908 psi | 71% | 1434 fps | 99.6% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,324 psi | 17% | 738 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 23,395 psi | 54% | 1230 fps | 100% |
| Lovex D036² | <<locked>> | 60% | 32,996 psi | 76% | 1490 fps | 98.2% |
| Lovex D037.1*² | <<locked>> | 72% | 28,747 psi | 66% | 1467 fps | 86.3% |
| Lovex S011² | <<locked>> | 60% | 29,588 psi | 68% | 1286 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 22,843 psi | 53% | 1240 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 18,347 psi | 42% | 1115 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 19,957 psi | 46% | 1161 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 21,466 psi | 49% | 1155 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 23,163 psi | 53% | 1168 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 26,092 psi | 60% | 1165 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 27,934 psi | 64% | 1362 fps | 100% |
| Ramshot True Blue² | <<locked>> | 60% | 32,053 psi | 74% | 1447 fps | 99.8% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 26,542 psi | 61% | 1257 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 6,991 psi | 16% | 738 fps | 98.3% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 18,086 psi | 42% | 1178 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 24,250 psi | 56% | 1358 fps | 85.8% |
| Rottweil P 801² | <<locked>> | 60% | 30,168 psi | 69% | 1273 fps | 100% |
| Rottweil P 806*² | 9.5 gr | 60% | 12,763 psi | 29% | 1106 fps | 86.8% |
| Shooters World Auto Pistol² | <<locked>> | 60% | 32,996 psi | 76% | 1490 fps | 98.2% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 28,747 psi | 66% | 1467 fps | 86.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 18,579 psi | 43% | 1138 fps | 99.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 23,206 psi | 53% | 1198 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 22,379 psi | 51% | 1198 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 27,064 psi | 62% | 1142 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7 gr | 60% | 15,766 psi | 36% | 1096 fps | 91.4% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 22,278 psi | 51% | 1204 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 19,841 psi | 46% | 1280 fps | 90.8% |
| Somchem MP200² | <<locked>> | 60% | 22,742 psi | 52% | 1257 fps | 99.9% |
| Somchem MS200² | <<locked>> | 60% | 20,653 psi | 47% | 1194 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 24,439 psi | 56% | 1342 fps | 89.6% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 18,115 psi | 42% | 1188 fps | 94.9% |
| Vihtavuori 3N38* | <<locked>> | 84% | 24,192 psi | 56% | 1355 fps | 86.9% |
| Vihtavuori N105* | <<locked>> | 84% | 19,522 psi | 45% | 1302 fps | 87% |
| Vihtavuori N320² | <<locked>> | 60% | 24,250 psi | 56% | 1194 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 12,067 psi | 28% | 889 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 22,742 psi | 52% | 1227 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 19,899 psi | 46% | 1188 fps | 99.8% |
| Vihtavuori N350*² | 6.8 gr | 60% | 15,345 psi | 35% | 1109 fps | 92.7% |
| Winchester 231² | <<locked>> | 60% | 30,734 psi | 71% | 1322 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 19,218 psi | 44% | 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 67 powders for .357 Mag. loaded with the .355 | 124gr | Geco FMJ. Rottweil P 806 delivers the highest muzzle velocity at 1,640 fps; across all powders the maximum-charge window runs from 991 fps to 1,640 fps. ADI AP 100 gives the best case fill at 100 %, and 40 of the 67 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 BLUE DOT, Alliant Herco 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, SNPE Vectan BA7 1/2 rank at the top here: for .357 Mag. with the .355 | 124gr | Geco FMJ 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, ADI APS 450, Alliant Herco 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.