Load Specifications
Load data in caliber .357 Maximum with .357 | 158gr | MAGTECH FMJ FLAT bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N32C Tin Star, ReloadSwiss RS 14 and Hodgdon TrailBoss.
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 4100* | <<locked>> | 80% | 36,463 psi | 81% | 1621 fps | 90.6% |
| Accurate No. 2² | <<locked>> | 64% | 38,363 psi | 85% | 1440 fps | 100% |
| Accurate No. 9² | <<locked>> | 68% | 36,332 psi | 81% | 1604 fps | 95.6% |
| Accurate Solo 1000² | <<locked>> | 68% | 39,552 psi | 88% | 1348 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 37,478 psi | 83% | 1375 fps | 100% |
| Accurate TCM² | <<locked>> | 68% | 36,114 psi | 80% | 1594 fps | 96.5% |
| ADI AP 100 | <<locked>> | 80% | 36,854 psi | 82% | 1532 fps | 100% |
| ADI APS 350² | <<locked>> | 68% | 38,203 psi | 85% | 1240 fps | 100% |
| ADI APS 450² | <<locked>> | 72% | 40,524 psi | 90% | 1299 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 38,276 psi | 85% | 1302 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 39,175 psi | 87% | 1355 fps | 100% |
| Alliant 2400* | <<locked>> | 80% | 40,379 psi | 90% | 1690 fps | 94.9% |
| Alliant BE-86² | <<locked>> | 68% | 38,580 psi | 86% | 1371 fps | 100% |
| Alliant BLUE DOT | <<locked>> | 80% | 36,956 psi | 82% | 1604 fps | 98.5% |
| Alliant Green Dot² | <<locked>> | 68% | 39,320 psi | 87% | 1358 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 38,101 psi | 85% | 1457 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 40,001 psi | 89% | 1624 fps | 100% |
| Alliant Power Pro 300-MP* | <<locked>> | 84% | 37,521 psi | 83% | 1673 fps | 88.6% |
| Alliant RED DOT² | <<locked>> | 68% | 37,405 psi | 83% | 1309 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 39,131 psi | 87% | 1473 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 39,914 psi | 89% | 1348 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 39,726 psi | 88% | 1355 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 40,147 psi | 89% | 1368 fps | 100% |
| Hodgdon Clays | <<locked>> | 80% | 40,393 psi | 90% | 1293 fps | 100% |
| Hodgdon H110* | <<locked>> | 84% | 38,812 psi | 86% | 1696 fps | 88.3% |
| Hodgdon LilGun* | <<locked>> | 88% | 37,492 psi | 83% | 1722 fps | 94.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 24,337 psi | 54% | 1096 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 39,595 psi | 88% | 1411 fps | 100% |
| Lovex D037.2² | <<locked>> | 68% | 36,796 psi | 82% | 1611 fps | 95.8% |
| Maxam CSB 1² | <<locked>> | 72% | 38,754 psi | 86% | 1385 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 39,813 psi | 89% | 1385 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 38,101 psi | 85% | 1355 fps | 100% |
| Maxam CSB 4² | <<locked>> | 68% | 40,364 psi | 90% | 1362 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 39,059 psi | 87% | 1299 fps | 100% |
| Ramshot Enforcer | <<locked>> | 80% | 40,292 psi | 90% | 1696 fps | 95.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 23,598 psi | 52% | 1119 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 38,203 psi | 85% | 1444 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 68% | 37,855 psi | 84% | 1608 fps | 99.8% |
| ReloadSwiss RS 30*ᴾ | <<locked>> | 100% | 33,576 psi | 75% | 1627 fps | 88.8% |
| Rottweil P 806² | <<locked>> | 68% | 36,651 psi | 82% | 1552 fps | 100% |
| Shooters World Heavy Pistol² | <<locked>> | 68% | 36,796 psi | 82% | 1611 fps | 95.8% |
| SNPE Vectan A0² | <<locked>> | 72% | 38,798 psi | 86% | 1430 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 37,449 psi | 83% | 1362 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 36,956 psi | 82% | 1378 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 64% | 37,913 psi | 84% | 1266 fps | 100% |
| SNPE Vectan BA6 1/2*ᴾ | <<locked>> | 100% | 32,198 psi | 72% | 1558 fps | 94.9% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 39,856 psi | 89% | 1516 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 37,014 psi | 82% | 1378 fps | 100% |
| Somchem MP200² | <<locked>> | 64% | 40,059 psi | 89% | 1480 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 39,204 psi | 87% | 1444 fps | 100% |
| Somchem S265* | <<locked>> | 96% | 39,885 psi | 89% | 1637 fps | 87.4% |
| Vihtavuori 3N37² | <<locked>> | 68% | 38,508 psi | 86% | 1509 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 39,015 psi | 87% | 1604 fps | 100% |
| Vihtavuori N105 | <<locked>> | 80% | 36,738 psi | 82% | 1601 fps | 100% |
| Vihtavuori N110ᴾ | <<locked>> | 100% | 40,683 psi | 90% | 1713 fps | 95.6% |
| Vihtavuori N320² | <<locked>> | 64% | 39,871 psi | 89% | 1352 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 39,436 psi | 88% | 1273 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 39,537 psi | 88% | 1447 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 38,130 psi | 85% | 1499 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 37,521 psi | 83% | 1391 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 4100*² | <<locked>> | 72% | 28,123 psi | 63% | 1470 fps | 86% |
| Accurate No. 2² | <<locked>> | 60% | 34,214 psi | 76% | 1388 fps | 100% |
| Accurate No. 9*² | <<locked>> | 60% | 27,340 psi | 61% | 1440 fps | 91.5% |
| Accurate Solo 1000² | <<locked>> | 60% | 32,503 psi | 72% | 1260 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 30,153 psi | 67% | 1280 fps | 100% |
| Accurate TCM*² | <<locked>> | 60% | 27,514 psi | 61% | 1440 fps | 92.8% |
| ADI AP 100² | <<locked>> | 60% | 21,886 psi | 49% | 1270 fps | 99.1% |
| ADI APS 350² | <<locked>> | 60% | 32,285 psi | 72% | 1165 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 31,227 psi | 69% | 1181 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 31,836 psi | 71% | 1217 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 35,244 psi | 78% | 1306 fps | 100% |
| Alliant 2400*² | <<locked>> | 64% | 24,671 psi | 55% | 1401 fps | 86.6% |
| Alliant BE-86² | <<locked>> | 60% | 31,386 psi | 70% | 1283 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 60% | 21,248 psi | 47% | 1293 fps | 91.3% |
| Alliant Green Dot² | <<locked>> | 60% | 32,372 psi | 72% | 1270 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 23,743 psi | 53% | 1237 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 31,792 psi | 71% | 1496 fps | 100% |
| Alliant Power Pro 300-MP* | <<locked>> | 80% | 33,170 psi | 74% | 1598 fps | 86.3% |
| Alliant RED DOT² | <<locked>> | 60% | 31,575 psi | 70% | 1230 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 31,502 psi | 70% | 1368 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 32,314 psi | 72% | 1257 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 22,669 psi | 50% | 1122 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 36,071 psi | 80% | 1322 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 26,789 psi | 60% | 1112 fps | 100% |
| Hodgdon H110* | <<locked>> | 80% | 34,229 psi | 76% | 1621 fps | 85.9% |
| Hodgdon LilGun*² | <<locked>> | 76% | 24,976 psi | 56% | 1490 fps | 87.6% |
| Hodgdon TrailBoss² | 4.9 gr | 60% | 12,009 psi | 27% | 837 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 35,853 psi | 80% | 1365 fps | 100% |
| Lovex D037.2*² | <<locked>> | 60% | 27,760 psi | 62% | 1450 fps | 91.7% |
| Maxam CSB 1² | <<locked>> | 60% | 28,355 psi | 63% | 1243 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 32,460 psi | 72% | 1293 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 31,343 psi | 70% | 1266 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 33,286 psi | 74% | 1273 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 35,070 psi | 78% | 1250 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 64% | 23,685 psi | 53% | 1391 fps | 87.2% |
| ReloadSwiss RS 14² | 5 gr | 60% | 11,647 psi | 26% | 850 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 30,589 psi | 68% | 1345 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 60% | 29,588 psi | 66% | 1470 fps | 98.4% |
| ReloadSwiss RS 30* | <<locked>> | 96% | 30,414 psi | 68% | 1565 fps | 86.7% |
| Rottweil P 806² | <<locked>> | 60% | 28,471 psi | 63% | 1427 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 60% | 27,760 psi | 62% | 1450 fps | 91.7% |
| SNPE Vectan A0² | <<locked>> | 60% | 28,819 psi | 64% | 1293 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 33,533 psi | 75% | 1312 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 33,011 psi | 73% | 1325 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 34,795 psi | 77% | 1227 fps | 100% |
| SNPE Vectan BA6 1/2* | <<locked>> | 80% | 19,247 psi | 43% | 1276 fps | 85.6% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 25,643 psi | 57% | 1306 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 32,924 psi | 73% | 1322 fps | 100% |
| Somchem MP200² | <<locked>> | 60% | 35,331 psi | 79% | 1421 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 31,604 psi | 70% | 1342 fps | 100% |
| Somchem S265* | <<locked>> | 92% | 35,766 psi | 80% | 1575 fps | 85.5% |
| Vihtavuori 3N37² | <<locked>> | 60% | 30,501 psi | 68% | 1398 fps | 100% |
| Vihtavuori 3N38² | <<locked>> | 60% | 22,089 psi | 49% | 1302 fps | 95.9% |
| Vihtavuori N105² | <<locked>> | 60% | 19,667 psi | 44% | 1286 fps | 97.6% |
| Vihtavuori N110* | <<locked>> | 80% | 22,989 psi | 51% | 1394 fps | 86.1% |
| Vihtavuori N320² | <<locked>> | 60% | 35,810 psi | 80% | 1306 fps | 100% |
| Vihtavuori N32C Tin Star² | 6.7 gr | 60% | 19,580 psi | 44% | 991 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 31,676 psi | 70% | 1345 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 27,006 psi | 60% | 1335 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 30,269 psi | 67% | 1293 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 60 powders for .357 Maximum loaded with the .357 | 158gr | MAGTECH FMJ FLAT. Hodgdon LilGun delivers the highest muzzle velocity at 1,722 fps; across all powders the maximum-charge window runs from 1,096 fps to 1,722 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 20 of the 60 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, ReloadSwiss RS 30 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 N32C Tin Star, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for .357 Maximum with the .357 | 158gr | MAGTECH FMJ FLAT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 4100, Alliant 2400, Alliant Power Pro 300-MP burn incompletely and react more sensitively to barrel length and temperature. Baschieri & Pellagri 102 Pistol, Hodgdon Clays, 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.