Load Specifications
Load data in caliber .357 Mag. with .355 | 115gr | Geco FMJ bullet and 68 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 ReloadSwiss RS 20.
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% | 35,462 psi | 82% | 1506 fps | 100% |
| Accurate No. 5² | <<locked>> | 64% | 37,478 psi | 86% | 1631 fps | 98.8% |
| Accurate No. 7* | <<locked>> | 80% | 37,130 psi | 85% | 1677 fps | 89.7% |
| Accurate Solo 1000 | <<locked>> | 80% | 37,550 psi | 86% | 1427 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 84% | 36,941 psi | 85% | 1483 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 35,839 psi | 82% | 1604 fps | 97.3% |
| ADI AP 70N² | <<locked>> | 72% | 39,262 psi | 90% | 1532 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 36,579 psi | 84% | 1293 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 38,435 psi | 88% | 1355 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 36,738 psi | 84% | 1385 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 36,637 psi | 84% | 1434 fps | 100% |
| Alliant BE-86 | <<locked>> | 84% | 38,769 psi | 89% | 1493 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 34,229 psi | 79% | 1611 fps | 87% |
| Alliant BULLSEYE² | <<locked>> | 76% | 38,653 psi | 89% | 1588 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 36,999 psi | 85% | 1444 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 37,536 psi | 86% | 1572 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 84% | 37,043 psi | 85% | 1673 fps | 97.1% |
| Alliant RED DOT | <<locked>> | 84% | 38,377 psi | 88% | 1427 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 35,824 psi | 82% | 1552 fps | 100% |
| Alliant UNIQUE | <<locked>> | 84% | 36,230 psi | 83% | 1562 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 37,101 psi | 85% | 1424 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 37,391 psi | 86% | 1440 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 37,768 psi | 87% | 1453 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 37,231 psi | 86% | 1316 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 35,752 psi | 82% | 1581 fps | 99.4% |
| Hodgdon Longshot² | <<locked>> | 64% | 34,447 psi | 79% | 1558 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 15,766 psi | 36% | 1043 fps | 100% |
| Hodgdon Universal | <<locked>> | 80% | 39,262 psi | 90% | 1532 fps | 100% |
| Lovex D036² | <<locked>> | 64% | 37,463 psi | 86% | 1631 fps | 98.7% |
| Lovex D037.1* | <<locked>> | 80% | 37,130 psi | 85% | 1677 fps | 89.7% |
| Lovex S011² | <<locked>> | 68% | 36,201 psi | 83% | 1444 fps | 100% |
| Lovex S020² | <<locked>> | 76% | 36,434 psi | 84% | 1516 fps | 100% |
| Maxam CSB 1 | <<locked>> | 88% | 37,159 psi | 85% | 1483 fps | 100% |
| Maxam CSB 2 | <<locked>> | 84% | 36,753 psi | 84% | 1483 fps | 100% |
| Maxam CSB 3 | <<locked>> | 84% | 38,464 psi | 88% | 1473 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 37,826 psi | 87% | 1440 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 37,768 psi | 87% | 1385 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 35,520 psi | 82% | 1549 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 35,665 psi | 82% | 1572 fps | 99.9% |
| ReloadSwiss RS 12² | <<locked>> | 72% | 36,695 psi | 84% | 1463 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 14,388 psi | 33% | 1047 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 88% | 38,667 psi | 89% | 1585 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 88% | 38,522 psi | 89% | 1683 fps | 92.7% |
| Rottweil P 801² | <<locked>> | 68% | 37,188 psi | 85% | 1430 fps | 100% |
| Rottweil P 806 | <<locked>> | 92% | 37,579 psi | 86% | 1699 fps | 99.9% |
| Shooters World Auto Pistol² | <<locked>> | 64% | 37,463 psi | 86% | 1631 fps | 98.7% |
| Shooters World Major Pistol* | <<locked>> | 80% | 37,130 psi | 85% | 1677 fps | 89.7% |
| SNPE Vectan A0 | <<locked>> | 88% | 37,536 psi | 86% | 1526 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 80% | 39,349 psi | 90% | 1493 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 38,261 psi | 88% | 1503 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 76% | 39,305 psi | 90% | 1365 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 92% | 36,347 psi | 84% | 1568 fps | 99.8% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 36,521 psi | 84% | 1490 fps | 100% |
| SNPE Vectan SP 2 | <<locked>> | 80% | 37,942 psi | 87% | 1696 fps | 98.6% |
| Somchem MP200 | <<locked>> | 80% | 39,160 psi | 90% | 1591 fps | 100% |
| Somchem MS200 | <<locked>> | 84% | 38,769 psi | 89% | 1555 fps | 100% |
| Somchem S221*² | <<locked>> | 72% | 36,332 psi | 84% | 1624 fps | 94.8% |
| Vihtavuori 3N37 | <<locked>> | 84% | 35,752 psi | 82% | 1591 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 96% | 34,911 psi | 80% | 1614 fps | 92% |
| Vihtavuori N105*ᴾ | <<locked>> | 100% | 30,501 psi | 70% | 1604 fps | 94.1% |
| Vihtavuori N310² | <<locked>> | 64% | 36,419 psi | 84% | 1332 fps | 100% |
| Vihtavuori N320² | <<locked>> | 76% | 36,535 psi | 84% | 1434 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 33,794 psi | 78% | 1312 fps | 100% |
| Vihtavuori N330 | <<locked>> | 80% | 38,000 psi | 87% | 1516 fps | 100% |
| Vihtavuori N340 | <<locked>> | 84% | 38,218 psi | 88% | 1552 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 36,608 psi | 84% | 1594 fps | 100% |
| Winchester 231² | <<locked>> | 68% | 38,334 psi | 88% | 1493 fps | 100% |
| Winchester AutoComp | <<locked>> | 84% | 36,303 psi | 83% | 1496 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% | 21,843 psi | 50% | 1273 fps | 98.9% |
| Accurate No. 5² | <<locked>> | 60% | 32,358 psi | 74% | 1549 fps | 97.5% |
| Accurate No. 7*² | <<locked>> | 76% | 32,184 psi | 74% | 1594 fps | 87.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 23,090 psi | 53% | 1214 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 19,174 psi | 44% | 1198 fps | 100% |
| ADI AP 100*² | <<locked>> | 72% | 17,695 psi | 41% | 1224 fps | 86.3% |
| ADI AP 70N² | <<locked>> | 60% | 28,050 psi | 64% | 1375 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 25,121 psi | 58% | 1135 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 24,337 psi | 56% | 1158 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 22,858 psi | 53% | 1178 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 24,613 psi | 57% | 1257 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 19,653 psi | 45% | 1201 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 31,096 psi | 71% | 1555 fps | 85.2% |
| Alliant BULLSEYE² | <<locked>> | 60% | 25,135 psi | 58% | 1371 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 22,249 psi | 51% | 1217 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 14,083 psi | 32% | 1099 fps | 96.3% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 18,449 psi | 42% | 1276 fps | 85.9% |
| Alliant RED DOT² | <<locked>> | 60% | 21,756 psi | 50% | 1178 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 28,050 psi | 64% | 1427 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 19,450 psi | 45% | 1253 fps | 99.3% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 21,553 psi | 50% | 1198 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 13,663 psi | 31% | 1043 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 23,293 psi | 54% | 1253 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 25,469 psi | 59% | 1155 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 27,166 psi | 62% | 1437 fps | 97.2% |
| Hodgdon Longshot² | <<locked>> | 60% | 30,342 psi | 70% | 1493 fps | 99.2% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,092 psi | 16% | 764 fps | 99.8% |
| Hodgdon Universal² | <<locked>> | 60% | 23,293 psi | 54% | 1289 fps | 100% |
| Lovex D036² | <<locked>> | 60% | 32,314 psi | 74% | 1549 fps | 97.4% |
| Lovex D037.1*² | <<locked>> | 76% | 32,184 psi | 74% | 1594 fps | 87.2% |
| Lovex S011² | <<locked>> | 60% | 28,587 psi | 66% | 1339 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 22,524 psi | 52% | 1296 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 18,362 psi | 42% | 1171 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 19,261 psi | 44% | 1207 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 20,871 psi | 48% | 1204 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 22,611 psi | 52% | 1217 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 25,599 psi | 59% | 1217 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 27,122 psi | 62% | 1414 fps | 100% |
| Ramshot True Blue² | <<locked>> | 60% | 31,444 psi | 72% | 1503 fps | 99.4% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 25,541 psi | 59% | 1306 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 6,759 psi | 16% | 764 fps | 97.3% |
| ReloadSwiss RS 20² | 6.6 gr | 60% | 17,303 psi | 40% | 1217 fps | 99.7% |
| ReloadSwiss RS 24*² | <<locked>> | 76% | 27,282 psi | 63% | 1486 fps | 86.9% |
| Rottweil P 801² | <<locked>> | 60% | 29,051 psi | 67% | 1322 fps | 100% |
| Rottweil P 806*² | 10.6 gr | 64% | 14,460 psi | 33% | 1214 fps | 88% |
| Shooters World Auto Pistol² | <<locked>> | 60% | 32,314 psi | 74% | 1549 fps | 97.4% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 32,184 psi | 74% | 1594 fps | 87.2% |
| SNPE Vectan A0² | <<locked>> | 60% | 18,463 psi | 42% | 1191 fps | 98.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 22,974 psi | 53% | 1253 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 22,147 psi | 51% | 1253 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 26,571 psi | 61% | 1194 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 15,505 psi | 36% | 1138 fps | 90.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 21,553 psi | 50% | 1250 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 19,609 psi | 45% | 1329 fps | 89.4% |
| Somchem MP200² | <<locked>> | 60% | 22,350 psi | 51% | 1309 fps | 99.6% |
| Somchem MS200² | <<locked>> | 60% | 20,537 psi | 47% | 1250 fps | 99.9% |
| Somchem S221*² | <<locked>> | 60% | 23,873 psi | 55% | 1388 fps | 88% |
| Vihtavuori 3N37*² | <<locked>> | 60% | 17,158 psi | 39% | 1217 fps | 93.1% |
| Vihtavuori 3N38* | <<locked>> | 84% | 24,845 psi | 57% | 1427 fps | 86.2% |
| Vihtavuori N105* | <<locked>> | 84% | 19,290 psi | 44% | 1352 fps | 85.3% |
| Vihtavuori N310² | <<locked>> | 60% | 33,446 psi | 77% | 1296 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 23,119 psi | 53% | 1237 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 13,590 psi | 31% | 978 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 21,524 psi | 49% | 1266 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 19,508 psi | 45% | 1237 fps | 99.5% |
| Vihtavuori N350*² | 7.2 gr | 60% | 15,780 psi | 36% | 1175 fps | 92.2% |
| Winchester 231² | <<locked>> | 60% | 30,197 psi | 69% | 1381 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 18,971 psi | 44% | 1204 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 68 powders for .357 Mag. loaded with the .355 | 115gr | Geco FMJ. Rottweil P 806 delivers the highest muzzle velocity at 1,699 fps; across all powders the maximum-charge window runs from 1,043 fps to 1,699 fps. ADI AP 100 gives the best case fill at 100 %, and 43 of the 68 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, ReloadSwiss RS 20 rank at the top here: for .357 Mag. with the .355 | 115gr | 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. Alliant Herco, Baschieri & Pellagri 102 Pistol, Hodgdon TrailBoss 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.