Load Specifications
Load data in caliber .357 Mag. with .355 | 124gr | Geco HEXAGON 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% | 36,579 psi | 84% | 1447 fps | 100% |
| Accurate No. 5² | <<locked>> | 64% | 38,638 psi | 89% | 1575 fps | 99.3% |
| Accurate No. 7* | <<locked>> | 80% | 37,956 psi | 87% | 1617 fps | 91% |
| Accurate Solo 1000 | <<locked>> | 80% | 38,145 psi | 88% | 1365 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 84% | 37,072 psi | 85% | 1414 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 36,361 psi | 84% | 1539 fps | 98% |
| ADI AP 70N² | <<locked>> | 68% | 35,911 psi | 83% | 1417 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 36,477 psi | 84% | 1227 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 38,725 psi | 89% | 1289 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 37,115 psi | 85% | 1319 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 37,260 psi | 86% | 1371 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 35,056 psi | 81% | 1375 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 35,389 psi | 81% | 1565 fps | 88.7% |
| Alliant BULLSEYE² | <<locked>> | 72% | 35,984 psi | 83% | 1476 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 37,608 psi | 86% | 1378 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 37,652 psi | 87% | 1499 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 84% | 37,463 psi | 86% | 1608 fps | 97.8% |
| Alliant RED DOT | <<locked>> | 84% | 38,769 psi | 89% | 1362 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 35,984 psi | 83% | 1480 fps | 100% |
| Alliant UNIQUE | <<locked>> | 84% | 37,536 psi | 86% | 1503 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 38,029 psi | 87% | 1365 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 38,101 psi | 88% | 1378 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 38,841 psi | 89% | 1394 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 37,956 psi | 87% | 1280 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 36,172 psi | 83% | 1516 fps | 99.7% |
| Hodgdon Longshot² | <<locked>> | 64% | 35,476 psi | 82% | 1503 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 15,737 psi | 36% | 991 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 35,911 psi | 83% | 1417 fps | 100% |
| Lovex D036² | <<locked>> | 64% | 38,624 psi | 89% | 1575 fps | 99.3% |
| Lovex D037.1* | <<locked>> | 80% | 37,956 psi | 87% | 1617 fps | 91% |
| Lovex S011² | <<locked>> | 68% | 36,941 psi | 85% | 1381 fps | 100% |
| Lovex S020² | <<locked>> | 76% | 37,753 psi | 87% | 1457 fps | 100% |
| Maxam CSB 1 | <<locked>> | 88% | 37,420 psi | 86% | 1414 fps | 100% |
| Maxam CSB 2 | <<locked>> | 84% | 37,971 psi | 87% | 1424 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 35,636 psi | 82% | 1368 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 38,566 psi | 89% | 1378 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 38,101 psi | 88% | 1319 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 36,201 psi | 83% | 1486 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 36,695 psi | 84% | 1512 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 72% | 36,782 psi | 85% | 1391 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 14,373 psi | 33% | 994 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 35,882 psi | 82% | 1476 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 35,085 psi | 81% | 1562 fps | 92.3% |
| Rottweil P 801² | <<locked>> | 68% | 37,173 psi | 85% | 1362 fps | 100% |
| Rottweil P 806 | <<locked>> | 92% | 38,841 psi | 89% | 1640 fps | 100% |
| Shooters World Auto Pistol² | <<locked>> | 64% | 38,624 psi | 89% | 1575 fps | 99.3% |
| Shooters World Major Pistol* | <<locked>> | 80% | 37,956 psi | 87% | 1617 fps | 91% |
| SNPE Vectan A0 | <<locked>> | 88% | 38,058 psi | 87% | 1460 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 35,520 psi | 82% | 1375 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 38,754 psi | 89% | 1434 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 36,796 psi | 85% | 1266 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 92% | 37,536 psi | 86% | 1512 fps | 100% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 37,608 psi | 86% | 1430 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 80% | 38,682 psi | 89% | 1631 fps | 99.1% |
| Somchem MP200² | <<locked>> | 76% | 35,592 psi | 82% | 1467 fps | 100% |
| Somchem MS200 | <<locked>> | 84% | 39,291 psi | 90% | 1490 fps | 100% |
| Somchem S221² | <<locked>> | 72% | 37,173 psi | 85% | 1568 fps | 95.8% |
| Vihtavuori 3N37 | <<locked>> | 84% | 36,840 psi | 85% | 1526 fps | 100% |
| Vihtavuori 3N38*ᴾ | <<locked>> | 100% | 36,927 psi | 85% | 1575 fps | 93.8% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 31,676 psi | 73% | 1558 fps | 95.5% |
| Vihtavuori N320² | <<locked>> | 76% | 37,710 psi | 87% | 1375 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 29,254 psi | 67% | 1194 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 36,753 psi | 84% | 1427 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 35,288 psi | 81% | 1440 fps | 100% |
| Vihtavuori N350 | <<locked>> | 92% | 38,783 psi | 89% | 1545 fps | 100% |
| Winchester 231² | <<locked>> | 68% | 38,551 psi | 89% | 1421 fps | 100% |
| Winchester AutoComp | <<locked>> | 84% | 37,043 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% | 22,075 psi | 51% | 1220 fps | 99.3% |
| Accurate No. 5² | <<locked>> | 60% | 33,199 psi | 76% | 1493 fps | 98.3% |
| Accurate No. 7*² | <<locked>> | 72% | 28,863 psi | 66% | 1467 fps | 86.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 23,670 psi | 54% | 1161 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 19,841 psi | 46% | 1152 fps | 100% |
| ADI AP 100*² | <<locked>> | 68% | 16,085 psi | 37% | 1125 fps | 85.6% |
| ADI AP 70N² | <<locked>> | 60% | 28,543 psi | 66% | 1316 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 25,367 psi | 58% | 1083 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 24,787 psi | 57% | 1109 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 23,279 psi | 54% | 1125 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 24,584 psi | 56% | 1194 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 20,494 psi | 47% | 1158 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 31,995 psi | 74% | 1506 fps | 86.9% |
| Alliant BULLSEYE² | <<locked>> | 60% | 25,382 psi | 58% | 1309 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 22,843 psi | 53% | 1165 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 14,620 psi | 34% | 1066 fps | 97.5% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 18,507 psi | 43% | 1224 fps | 87.1% |
| Alliant RED DOT² | <<locked>> | 60% | 22,147 psi | 51% | 1125 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 28,601 psi | 66% | 1368 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 19,624 psi | 45% | 1198 fps | 99.7% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 22,249 psi | 51% | 1152 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 14,127 psi | 32% | 1004 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 24,047 psi | 55% | 1204 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 20,088 psi | 46% | 1027 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 27,789 psi | 64% | 1381 fps | 98% |
| Hodgdon Longshot² | <<locked>> | 60% | 30,385 psi | 70% | 1424 fps | 99.5% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,353 psi | 17% | 738 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 23,525 psi | 54% | 1230 fps | 100% |
| Lovex D036² | <<locked>> | 60% | 33,141 psi | 76% | 1493 fps | 98.2% |
| Lovex D037.1*² | <<locked>> | 72% | 28,863 psi | 66% | 1467 fps | 86.3% |
| Lovex S011² | <<locked>> | 60% | 28,877 psi | 66% | 1276 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 22,916 psi | 53% | 1240 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 18,434 psi | 42% | 1115 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 20,015 psi | 46% | 1161 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 21,524 psi | 49% | 1158 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 23,264 psi | 53% | 1168 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 26,208 psi | 60% | 1165 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 28,050 psi | 64% | 1365 fps | 100% |
| Ramshot True Blue² | <<locked>> | 60% | 31,488 psi | 72% | 1437 fps | 99.7% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 26,687 psi | 61% | 1257 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 6,991 psi | 16% | 738 fps | 98.3% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 18,130 psi | 42% | 1181 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 24,337 psi | 56% | 1362 fps | 85.8% |
| Rottweil P 801² | <<locked>> | 60% | 30,327 psi | 70% | 1273 fps | 100% |
| Rottweil P 806*² | 9.5 gr | 60% | 12,792 psi | 29% | 1109 fps | 86.8% |
| Shooters World Auto Pistol² | <<locked>> | 60% | 33,141 psi | 76% | 1493 fps | 98.2% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 28,863 psi | 66% | 1467 fps | 86.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 18,623 psi | 43% | 1138 fps | 99.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 23,308 psi | 54% | 1198 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 22,466 psi | 52% | 1198 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 27,180 psi | 62% | 1145 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7 gr | 60% | 15,809 psi | 36% | 1099 fps | 91.5% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 21,727 psi | 50% | 1191 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 19,914 psi | 46% | 1280 fps | 90.9% |
| Somchem MP200² | <<locked>> | 60% | 22,814 psi | 52% | 1260 fps | 99.9% |
| Somchem MS200² | <<locked>> | 60% | 20,740 psi | 48% | 1198 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 24,540 psi | 56% | 1342 fps | 89.6% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 17,724 psi | 41% | 1175 fps | 94.5% |
| Vihtavuori 3N38* | <<locked>> | 84% | 23,757 psi | 55% | 1342 fps | 86.5% |
| Vihtavuori N105* | <<locked>> | 84% | 19,609 psi | 45% | 1306 fps | 87% |
| Vihtavuori N320² | <<locked>> | 60% | 24,308 psi | 56% | 1194 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 12,096 psi | 28% | 889 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 22,814 psi | 52% | 1230 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 20,015 psi | 46% | 1188 fps | 99.8% |
| Vihtavuori N350*² | 6.8 gr | 60% | 15,389 psi | 35% | 1112 fps | 92.8% |
| Winchester 231² | <<locked>> | 60% | 30,850 psi | 71% | 1322 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 19,305 psi | 44% | 1155 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 HEXAGON. 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 HEXAGON 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.