Load Specifications
Load data in caliber .357 Maximum with .355 | 124gr | Geco HEXAGON bullet and 62 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori 3N38, Vihtavuori N105 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: 7.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 68% | 37,753 psi | 84% | 1660 fps | 100% |
| Accurate No. 7² | <<locked>> | 68% | 38,392 psi | 85% | 1857 fps | 97.2% |
| Accurate No. 9*² | <<locked>> | 76% | 38,783 psi | 86% | 1860 fps | 93.1% |
| Accurate Solo 1000² | <<locked>> | 72% | 39,073 psi | 87% | 1555 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 76% | 40,118 psi | 89% | 1631 fps | 100% |
| Accurate TCM*² | <<locked>> | 76% | 38,493 psi | 86% | 1847 fps | 94.1% |
| ADI AP 100 | <<locked>> | 88% | 38,609 psi | 86% | 1788 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 39,407 psi | 88% | 1447 fps | 100% |
| ADI APS 450² | <<locked>> | 72% | 37,898 psi | 84% | 1460 fps | 100% |
| ADI AS 30² | <<locked>> | 72% | 37,971 psi | 84% | 1506 fps | 100% |
| ADI AS 50N² | <<locked>> | 68% | 38,783 psi | 86% | 1568 fps | 100% |
| Alliant 2400* | <<locked>> | 84% | 36,361 psi | 81% | 1841 fps | 89.3% |
| Alliant BE-86² | <<locked>> | 72% | 37,782 psi | 84% | 1581 fps | 100% |
| Alliant BLUE DOT | <<locked>> | 88% | 38,087 psi | 85% | 1844 fps | 96.3% |
| Alliant BULLSEYE² | <<locked>> | 64% | 37,550 psi | 84% | 1686 fps | 100% |
| Alliant Green Dot² | <<locked>> | 72% | 38,885 psi | 86% | 1572 fps | 100% |
| Alliant Herco | <<locked>> | 88% | 39,508 psi | 88% | 1706 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 72% | 38,464 psi | 86% | 1841 fps | 100% |
| Alliant RED DOT² | <<locked>> | 76% | 40,335 psi | 90% | 1558 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 72% | 37,391 psi | 83% | 1686 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 72% | 39,204 psi | 87% | 1555 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 88% | 38,319 psi | 85% | 1552 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 68% | 40,234 psi | 89% | 1581 fps | 100% |
| Hodgdon Clays | <<locked>> | 80% | 37,637 psi | 84% | 1453 fps | 100% |
| Hodgdon LilGun* | <<locked>> | 96% | 37,550 psi | 84% | 1946 fps | 90.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,958 psi | 47% | 1224 fps | 100% |
| Hodgdon Universal² | <<locked>> | 68% | 38,551 psi | 86% | 1627 fps | 100% |
| Lovex D037.1² | <<locked>> | 68% | 38,392 psi | 85% | 1857 fps | 97.2% |
| Lovex D037.2*² | <<locked>> | 76% | 39,813 psi | 89% | 1873 fps | 93.5% |
| Lovex S020² | <<locked>> | 68% | 40,132 psi | 89% | 1667 fps | 100% |
| Maxam CSB 1² | <<locked>> | 76% | 37,275 psi | 83% | 1585 fps | 100% |
| Maxam CSB 2² | <<locked>> | 72% | 37,753 psi | 84% | 1588 fps | 100% |
| Maxam CSB 3² | <<locked>> | 72% | 37,420 psi | 83% | 1565 fps | 100% |
| Maxam CSB 4² | <<locked>> | 72% | 39,421 psi | 88% | 1568 fps | 100% |
| Maxam CSB 5² | <<locked>> | 68% | 38,957 psi | 87% | 1506 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 84% | 36,230 psi | 81% | 1847 fps | 90.6% |
| ReloadSwiss RS 12² | <<locked>> | 64% | 39,581 psi | 88% | 1591 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,392 psi | 43% | 1230 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 76% | 40,466 psi | 90% | 1709 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 76% | 40,451 psi | 90% | 1880 fps | 98.9% |
| Rottweil P 806² | <<locked>> | 76% | 37,579 psi | 84% | 1808 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 76% | 39,813 psi | 89% | 1873 fps | 93.5% |
| Shooters World Major Pistol² | <<locked>> | 68% | 38,392 psi | 85% | 1857 fps | 97.2% |
| SNPE Vectan A0² | <<locked>> | 76% | 37,521 psi | 83% | 1637 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 68% | 36,869 psi | 82% | 1568 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 72% | 40,234 psi | 89% | 1637 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 68% | 39,146 psi | 87% | 1476 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 80% | 37,550 psi | 84% | 1716 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 72% | 39,827 psi | 89% | 1637 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 68% | 39,740 psi | 88% | 1854 fps | 100% |
| Somchem MP200² | <<locked>> | 68% | 38,798 psi | 86% | 1696 fps | 100% |
| Somchem MS200² | <<locked>> | 72% | 38,029 psi | 85% | 1657 fps | 100% |
| Somchem S221² | <<locked>> | 64% | 40,553 psi | 90% | 1844 fps | 99.9% |
| Vihtavuori 3N37² | <<locked>> | 72% | 37,144 psi | 83% | 1726 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 88% | 40,161 psi | 89% | 1850 fps | 99.2% |
| Vihtavuori N105 | <<locked>> | 88% | 36,898 psi | 82% | 1844 fps | 100% |
| Vihtavuori N320² | <<locked>> | 68% | 39,189 psi | 87% | 1565 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 37,623 psi | 84% | 1453 fps | 100% |
| Vihtavuori N330² | <<locked>> | 68% | 39,581 psi | 88% | 1634 fps | 100% |
| Vihtavuori N340² | <<locked>> | 72% | 38,609 psi | 86% | 1667 fps | 100% |
| Vihtavuori N350 | <<locked>> | 80% | 39,972 psi | 89% | 1759 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 76% | 39,465 psi | 88% | 1637 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 7.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 29,472 psi | 66% | 1532 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 28,660 psi | 64% | 1673 fps | 93.3% |
| Accurate No. 9*² | <<locked>> | 64% | 25,179 psi | 56% | 1585 fps | 85.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 29,399 psi | 65% | 1414 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 26,107 psi | 58% | 1421 fps | 100% |
| Accurate TCM*² | <<locked>> | 64% | 25,222 psi | 56% | 1585 fps | 86.9% |
| ADI AP 100*² | 10.4 gr | 60% | 17,854 psi | 40% | 1345 fps | 94.1% |
| ADI APS 350² | <<locked>> | 60% | 29,907 psi | 67% | 1309 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 29,138 psi | 65% | 1332 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,863 psi | 64% | 1368 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 31,459 psi | 70% | 1460 fps | 100% |
| Alliant 2400* | <<locked>> | 80% | 32,256 psi | 72% | 1765 fps | 87.2% |
| Alliant BE-86² | <<locked>> | 60% | 26,919 psi | 60% | 1421 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 68% | 21,495 psi | 48% | 1486 fps | 87% |
| Alliant BULLSEYE² | <<locked>> | 60% | 33,272 psi | 74% | 1621 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 28,819 psi | 64% | 1421 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 19,725 psi | 44% | 1352 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 26,571 psi | 59% | 1614 fps | 98.2% |
| Alliant RED DOT² | <<locked>> | 60% | 27,876 psi | 62% | 1375 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 26,672 psi | 59% | 1506 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,471 psi | 63% | 1404 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,768 psi | 42% | 1234 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 31,473 psi | 70% | 1467 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,337 psi | 54% | 1247 fps | 100% |
| Hodgdon LilGun* | <<locked>> | 92% | 32,213 psi | 72% | 1844 fps | 87.8% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,645 psi | 21% | 922 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 31,009 psi | 69% | 1516 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 28,660 psi | 64% | 1673 fps | 93.3% |
| Lovex D037.2*² | <<locked>> | 64% | 25,541 psi | 57% | 1594 fps | 85.8% |
| Lovex S020² | <<locked>> | 60% | 31,401 psi | 70% | 1545 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 24,482 psi | 54% | 1381 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 27,514 psi | 61% | 1434 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 27,659 psi | 62% | 1414 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 29,138 psi | 65% | 1417 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 31,952 psi | 71% | 1407 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 76% | 27,238 psi | 61% | 1667 fps | 85.2% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 35,215 psi | 78% | 1532 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 9,137 psi | 20% | 928 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 25,527 psi | 57% | 1480 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 24,033 psi | 53% | 1552 fps | 92.7% |
| Rottweil P 806² | <<locked>> | 60% | 21,538 psi | 48% | 1506 fps | 99.4% |
| Shooters World Heavy Pistol*² | <<locked>> | 64% | 25,541 psi | 57% | 1594 fps | 85.8% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 28,660 psi | 64% | 1673 fps | 93.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 24,787 psi | 55% | 1430 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 30,023 psi | 67% | 1467 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 29,327 psi | 65% | 1480 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 31,923 psi | 71% | 1375 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 21,640 psi | 48% | 1421 fps | 99.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 28,587 psi | 64% | 1470 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 30,211 psi | 67% | 1690 fps | 99.8% |
| Somchem MP200² | <<locked>> | 60% | 30,603 psi | 68% | 1572 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 27,209 psi | 61% | 1483 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 34,940 psi | 78% | 1752 fps | 99.2% |
| Vihtavuori 3N37² | <<locked>> | 60% | 25,440 psi | 57% | 1522 fps | 100% |
| Vihtavuori 3N38*² | 12 gr | 60% | 17,419 psi | 39% | 1362 fps | 87.9% |
| Vihtavuori N105*² | 11.8 gr | 60% | 14,475 psi | 32% | 1316 fps | 88.6% |
| Vihtavuori N320² | <<locked>> | 60% | 31,473 psi | 70% | 1457 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 16,302 psi | 36% | 1099 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 31,517 psi | 70% | 1519 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 27,383 psi | 61% | 1493 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 22,017 psi | 49% | 1444 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 25,686 psi | 57% | 1427 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 62 powders for .357 Maximum loaded with the .355 | 124gr | Geco HEXAGON. Hodgdon LilGun delivers the highest muzzle velocity at 1,946 fps; across all powders the maximum-charge window runs from 1,224 fps to 1,946 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 15 of the 62 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 43–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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 3N38, Vihtavuori N105, ADI AP 100 rank at the top here: for .357 Maximum 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. 9, Accurate TCM, Alliant 2400 burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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.