Load Specifications
Load data in caliber .357 Mag. with .355 | 121gr | Frontier Bullets CMJ FP atch bullet and 62 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.
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Max Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 76% | 39,334 psi | 90% | 1519 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 38,566 psi | 89% | 1663 fps | 91.8% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,681 psi | 87% | 1394 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,463 psi | 86% | 1453 fps | 100% |
| ADI AP 100 | <<locked>> | 96% | 36,912 psi | 85% | 1585 fps | 98.4% |
| ADI AP 70N² | <<locked>> | 64% | 35,563 psi | 82% | 1440 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 39,059 psi | 90% | 1296 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,086 psi | 85% | 1306 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 37,376 psi | 86% | 1352 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 37,405 psi | 86% | 1404 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 39,146 psi | 90% | 1457 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 36,289 psi | 83% | 1617 fps | 89.7% |
| Alliant BULLSEYE² | <<locked>> | 72% | 38,943 psi | 90% | 1552 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,898 psi | 85% | 1401 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 39,131 psi | 90% | 1549 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 37,753 psi | 87% | 1647 fps | 98.1% |
| Alliant RED DOT | <<locked>> | 80% | 39,044 psi | 90% | 1394 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 35,520 psi | 82% | 1506 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,420 psi | 86% | 1535 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,536 psi | 86% | 1394 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 38,624 psi | 89% | 1417 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 38,072 psi | 88% | 1417 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 36,434 psi | 84% | 1296 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 35,607 psi | 82% | 1545 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,492 psi | 43% | 1056 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 36,332 psi | 84% | 1450 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 38,566 psi | 89% | 1663 fps | 91.8% |
| Lovex S011² | <<locked>> | 64% | 35,563 psi | 82% | 1398 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 37,362 psi | 86% | 1486 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,695 psi | 87% | 1450 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 38,319 psi | 88% | 1453 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 38,856 psi | 89% | 1440 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,420 psi | 86% | 1398 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 38,101 psi | 88% | 1352 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 35,433 psi | 81% | 1506 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,608 psi | 86% | 1427 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,361 psi | 40% | 1066 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 36,187 psi | 83% | 1509 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 80% | 35,520 psi | 82% | 1604 fps | 92.9% |
| Rottweil P 801² | <<locked>> | 64% | 37,768 psi | 87% | 1394 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 35,708 psi | 82% | 1627 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 38,566 psi | 89% | 1663 fps | 91.8% |
| SNPE Vectan A0 | <<locked>> | 84% | 37,768 psi | 87% | 1490 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 38,493 psi | 88% | 1447 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 37,536 psi | 86% | 1457 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,827 psi | 89% | 1329 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,405 psi | 86% | 1549 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 37,130 psi | 85% | 1457 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 72% | 35,186 psi | 81% | 1611 fps | 98.6% |
| Somchem MP200² | <<locked>> | 72% | 35,940 psi | 83% | 1506 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 39,349 psi | 90% | 1522 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 36,709 psi | 84% | 1594 fps | 96.1% |
| Vihtavuori 3N37 | <<locked>> | 80% | 37,188 psi | 85% | 1568 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 96% | 37,855 psi | 87% | 1627 fps | 94.6% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 36,898 psi | 85% | 1677 fps | 97.7% |
| Vihtavuori N320² | <<locked>> | 72% | 36,927 psi | 85% | 1394 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,837 psi | 75% | 1260 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 36,637 psi | 84% | 1453 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 38,856 psi | 89% | 1519 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 35,766 psi | 82% | 1542 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 37,942 psi | 87% | 1447 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 37,043 psi | 85% | 1463 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% | 24,772 psi | 57% | 1299 fps | 99.9% |
| Accurate No. 7*² | <<locked>> | 68% | 28,892 psi | 66% | 1496 fps | 86.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,338 psi | 58% | 1214 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,365 psi | 51% | 1220 fps | 100% |
| ADI AP 100*² | 7.3 gr | 60% | 15,273 psi | 35% | 1115 fps | 85.1% |
| ADI AP 70N² | <<locked>> | 60% | 31,792 psi | 73% | 1388 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,122 psi | 62% | 1135 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,223 psi | 60% | 1155 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,570 psi | 59% | 1184 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,325 psi | 63% | 1260 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 23,293 psi | 54% | 1227 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 29,936 psi | 69% | 1499 fps | 86.2% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,224 psi | 65% | 1388 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,657 psi | 59% | 1234 fps | 100% |
| Alliant Herco² | 6.6 gr | 60% | 17,085 psi | 39% | 1145 fps | 99.1% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,350 psi | 49% | 1319 fps | 90.2% |
| Alliant RED DOT² | <<locked>> | 60% | 24,627 psi | 57% | 1188 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,734 psi | 73% | 1450 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,858 psi | 53% | 1286 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,758 psi | 57% | 1214 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,708 psi | 38% | 1070 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,629 psi | 61% | 1266 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,886 psi | 50% | 1079 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 31,154 psi | 72% | 1473 fps | 99.1% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,253 psi | 21% | 797 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,992 psi | 62% | 1309 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 28,892 psi | 66% | 1496 fps | 86.9% |
| Lovex S011² | <<locked>> | 60% | 31,517 psi | 72% | 1345 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,107 psi | 60% | 1319 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,972 psi | 48% | 1184 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,351 psi | 54% | 1234 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 24,149 psi | 56% | 1224 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,164 psi | 58% | 1220 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,152 psi | 65% | 1217 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,690 psi | 71% | 1437 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 29,907 psi | 69% | 1322 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 8,978 psi | 21% | 804 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 21,176 psi | 49% | 1263 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 24,932 psi | 57% | 1398 fps | 86.8% |
| Rottweil P 801² | <<locked>> | 60% | 33,808 psi | 78% | 1342 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 16,723 psi | 38% | 1234 fps | 92.2% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 28,892 psi | 66% | 1496 fps | 86.9% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,711 psi | 48% | 1207 fps | 99.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,686 psi | 59% | 1263 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,801 psi | 57% | 1266 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,153 psi | 67% | 1201 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7.7 gr | 60% | 18,115 psi | 42% | 1178 fps | 94.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,714 psi | 57% | 1266 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 23,830 psi | 55% | 1391 fps | 94.1% |
| Somchem MP200² | <<locked>> | 60% | 25,469 psi | 59% | 1335 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,598 psi | 54% | 1276 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 28,543 psi | 66% | 1450 fps | 92.6% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,711 psi | 48% | 1266 fps | 96.9% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 22,626 psi | 52% | 1339 fps | 86% |
| Vihtavuori N105*² | <<locked>> | 76% | 18,710 psi | 43% | 1299 fps | 86.5% |
| Vihtavuori N320² | <<locked>> | 60% | 27,209 psi | 63% | 1260 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,808 psi | 34% | 955 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 26,150 psi | 60% | 1306 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,902 psi | 53% | 1266 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 17,999 psi | 41% | 1198 fps | 95.5% |
| Winchester 231² | <<locked>> | 60% | 34,069 psi | 78% | 1398 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 22,075 psi | 51% | 1227 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 Mag. loaded with the .355 | 121gr | Frontier Bullets CMJ FP atch. Vihtavuori N105 delivers the highest muzzle velocity at 1,677 fps; across all powders the maximum-charge window runs from 1,056 fps to 1,677 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 28 of the 62 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 .355 | 121gr | Frontier Bullets CMJ FP atch 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 AP 100, Baschieri & Pellagri 102 Pistol, Hodgdon Clays 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.