Load Specifications
Load data in caliber .357 Mag. with .357 | 125gr | X-TREME FP bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N105, ADI AP 100 and Vihtavuori N350.
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>> | 72% | 35,592 psi | 82% | 1440 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 38,783 psi | 89% | 1634 fps | 92.3% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,376 psi | 86% | 1358 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,376 psi | 86% | 1421 fps | 100% |
| Accurate TCM* | <<locked>> | 84% | 37,913 psi | 87% | 1604 fps | 87.4% |
| ADI AP 100 | <<locked>> | 96% | 37,347 psi | 86% | 1562 fps | 98.7% |
| ADI AP 70N² | <<locked>> | 64% | 35,418 psi | 81% | 1407 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,522 psi | 89% | 1260 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,594 psi | 86% | 1283 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 36,985 psi | 85% | 1319 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 37,173 psi | 85% | 1368 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 39,291 psi | 90% | 1427 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 36,318 psi | 83% | 1585 fps | 90.1% |
| Alliant BULLSEYE² | <<locked>> | 72% | 38,928 psi | 89% | 1519 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 37,492 psi | 86% | 1378 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 38,682 psi | 89% | 1512 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 38,101 psi | 88% | 1621 fps | 98.4% |
| Alliant RED DOT | <<locked>> | 80% | 38,682 psi | 89% | 1362 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 35,433 psi | 81% | 1476 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 38,290 psi | 88% | 1512 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,376 psi | 86% | 1362 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 38,798 psi | 89% | 1388 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 38,421 psi | 88% | 1391 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 76% | 38,305 psi | 88% | 1440 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 36,912 psi | 85% | 1273 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 36,056 psi | 83% | 1519 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,681 psi | 43% | 1037 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 36,274 psi | 83% | 1417 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 38,783 psi | 89% | 1634 fps | 92.3% |
| Lovex S011² | <<locked>> | 64% | 36,143 psi | 83% | 1378 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 37,318 psi | 86% | 1453 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,695 psi | 87% | 1417 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 39,146 psi | 90% | 1434 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 38,754 psi | 89% | 1404 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,942 psi | 87% | 1375 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,724 psi | 87% | 1316 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 35,592 psi | 82% | 1476 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,478 psi | 86% | 1391 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,550 psi | 40% | 1047 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 36,390 psi | 84% | 1480 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 80% | 35,462 psi | 82% | 1572 fps | 93.2% |
| Rottweil P 801² | <<locked>> | 64% | 37,536 psi | 86% | 1358 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 35,911 psi | 83% | 1598 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 38,783 psi | 89% | 1634 fps | 92.3% |
| SNPE Vectan A0 | <<locked>> | 84% | 38,653 psi | 89% | 1470 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 39,363 psi | 90% | 1424 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 38,421 psi | 88% | 1437 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,421 psi | 88% | 1293 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,826 psi | 87% | 1522 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 37,144 psi | 85% | 1424 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 39,247 psi | 90% | 1637 fps | 99.5% |
| Somchem MP200² | <<locked>> | 72% | 36,085 psi | 83% | 1476 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 39,363 psi | 90% | 1493 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 37,260 psi | 86% | 1575 fps | 96.5% |
| Vihtavuori 3N37 | <<locked>> | 80% | 37,579 psi | 86% | 1542 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 96% | 38,653 psi | 89% | 1608 fps | 95.2% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 37,057 psi | 85% | 1644 fps | 98% |
| Vihtavuori N320² | <<locked>> | 72% | 37,521 psi | 86% | 1371 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,663 psi | 75% | 1230 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 36,637 psi | 84% | 1424 fps | 100% |
| Vihtavuori N340² | <<locked>> | 76% | 35,694 psi | 82% | 1447 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 39,233 psi | 90% | 1558 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 37,884 psi | 87% | 1414 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 37,217 psi | 86% | 1434 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% | 24,511 psi | 56% | 1266 fps | 99.9% |
| Accurate No. 7*² | <<locked>> | 64% | 25,788 psi | 59% | 1404 fps | 85.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,599 psi | 59% | 1191 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,655 psi | 52% | 1201 fps | 100% |
| Accurate TCM* | <<locked>> | 80% | 33,504 psi | 77% | 1532 fps | 85.2% |
| ADI AP 100*² | 7.1 gr | 60% | 15,200 psi | 35% | 1089 fps | 85.5% |
| ADI AP 70N² | <<locked>> | 60% | 31,604 psi | 73% | 1355 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,209 psi | 63% | 1112 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,411 psi | 61% | 1135 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,715 psi | 59% | 1161 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,615 psi | 63% | 1237 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 23,105 psi | 53% | 1198 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 29,863 psi | 69% | 1473 fps | 86.6% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,920 psi | 64% | 1352 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,208 psi | 58% | 1201 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 17,303 psi | 40% | 1125 fps | 99.3% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,828 psi | 50% | 1302 fps | 91% |
| Alliant RED DOT² | <<locked>> | 60% | 24,787 psi | 57% | 1165 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,575 psi | 73% | 1417 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,640 psi | 52% | 1257 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 25,063 psi | 58% | 1191 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,433 psi | 38% | 1043 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 27,209 psi | 63% | 1247 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 24,714 psi | 57% | 1243 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,973 psi | 51% | 1060 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 31,415 psi | 72% | 1447 fps | 99.3% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,514 psi | 22% | 791 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,716 psi | 61% | 1276 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 25,788 psi | 59% | 1404 fps | 85.2% |
| Lovex S011² | <<locked>> | 60% | 32,010 psi | 74% | 1322 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,542 psi | 61% | 1299 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 21,219 psi | 49% | 1165 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,641 psi | 54% | 1211 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,757 psi | 55% | 1191 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,454 psi | 59% | 1201 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,398 psi | 65% | 1194 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 31,401 psi | 72% | 1417 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 30,342 psi | 70% | 1299 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 8,949 psi | 21% | 787 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 21,016 psi | 48% | 1230 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 64% | 22,350 psi | 51% | 1316 fps | 85.2% |
| Rottweil P 801² | <<locked>> | 60% | 33,576 psi | 77% | 1309 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 16,955 psi | 39% | 1217 fps | 93% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 25,788 psi | 59% | 1404 fps | 85.2% |
| SNPE Vectan A0² | <<locked>> | 60% | 21,002 psi | 48% | 1188 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,454 psi | 59% | 1230 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,656 psi | 57% | 1237 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,399 psi | 68% | 1178 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 18,463 psi | 42% | 1165 fps | 94.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 25,034 psi | 58% | 1247 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 23,946 psi | 55% | 1365 fps | 94.5% |
| Somchem MP200² | <<locked>> | 60% | 25,962 psi | 60% | 1316 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,351 psi | 54% | 1243 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 28,805 psi | 66% | 1427 fps | 93.1% |
| Vihtavuori 3N37² | <<locked>> | 60% | 21,147 psi | 49% | 1253 fps | 97.4% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 22,843 psi | 53% | 1319 fps | 86.7% |
| Vihtavuori N105*² | 10.2 gr | 76% | 18,840 psi | 43% | 1280 fps | 87.3% |
| Vihtavuori N320² | <<locked>> | 60% | 27,557 psi | 63% | 1237 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,866 psi | 34% | 935 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,904 psi | 60% | 1273 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,742 psi | 52% | 1237 fps | 100% |
| Vihtavuori N350² | 7.4 gr | 60% | 18,347 psi | 42% | 1181 fps | 96% |
| Winchester 231² | <<locked>> | 60% | 33,924 psi | 78% | 1365 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 22,423 psi | 52% | 1207 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 14 powders for .357 Mag. loaded with the .357 | 125gr | X-TREME FP. Vihtavuori N105 delivers the highest muzzle velocity at 1,644 fps; across all powders the maximum-charge window runs from 1,037 fps to 1,644 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 14 of the 14 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. Vihtavuori N105, ADI AP 100, Vihtavuori N350 rank at the top here: for .357 Mag. with the .357 | 125gr | X-TREME FP they combine a high case fill with complete burn and sit in the upper velocity band. 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.