Load Specifications
Load data in caliber .357 Mag. with .357 | 125gr | Speer JHP 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 76% | 39,247 psi | 90% | 1506 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 37,884 psi | 87% | 1644 fps | 92.3% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,710 psi | 87% | 1381 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,130 psi | 85% | 1434 fps | 100% |
| Accurate TCM* | <<locked>> | 84% | 36,927 psi | 85% | 1611 fps | 87.5% |
| ADI AP 100 | <<locked>> | 96% | 36,869 psi | 85% | 1575 fps | 98.8% |
| ADI AP 70N² | <<locked>> | 68% | 38,754 psi | 89% | 1470 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,479 psi | 88% | 1276 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,318 psi | 86% | 1299 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 36,201 psi | 83% | 1329 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 36,158 psi | 83% | 1378 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 38,450 psi | 88% | 1437 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 35,578 psi | 82% | 1598 fps | 90.3% |
| Alliant BULLSEYE² | <<locked>> | 72% | 38,870 psi | 89% | 1535 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,477 psi | 84% | 1388 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 38,029 psi | 87% | 1526 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 37,739 psi | 87% | 1634 fps | 98.5% |
| Alliant RED DOT | <<locked>> | 80% | 37,855 psi | 87% | 1371 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 39,363 psi | 90% | 1549 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 36,593 psi | 84% | 1512 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 36,347 psi | 84% | 1368 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 37,768 psi | 87% | 1398 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,101 psi | 85% | 1394 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 39,030 psi | 90% | 1316 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 34,795 psi | 80% | 1522 fps | 99.8% |
| Hodgdon Longshot² | <<locked>> | 64% | 38,595 psi | 89% | 1565 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,085 psi | 39% | 1030 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 38,754 psi | 89% | 1470 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 37,884 psi | 87% | 1644 fps | 92.3% |
| Lovex S011² | <<locked>> | 64% | 35,520 psi | 82% | 1385 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 36,651 psi | 84% | 1467 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,289 psi | 86% | 1434 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 37,362 psi | 86% | 1434 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 38,609 psi | 89% | 1424 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,217 psi | 86% | 1385 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,173 psi | 85% | 1332 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 39,218 psi | 90% | 1545 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 36,564 psi | 84% | 1404 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,099 psi | 37% | 1047 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 35,665 psi | 82% | 1493 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 84% | 39,320 psi | 90% | 1654 fps | 95% |
| Rottweil P 801² | <<locked>> | 64% | 35,984 psi | 83% | 1365 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 34,795 psi | 80% | 1604 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 37,884 psi | 87% | 1644 fps | 92.3% |
| SNPE Vectan A0 | <<locked>> | 84% | 38,189 psi | 88% | 1483 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 38,159 psi | 88% | 1430 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 37,260 psi | 86% | 1440 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,130 psi | 88% | 1306 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,333 psi | 86% | 1535 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 36,666 psi | 84% | 1440 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 38,247 psi | 88% | 1647 fps | 99.5% |
| Somchem MP200² | <<locked>> | 76% | 39,073 psi | 90% | 1535 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,740 psi | 89% | 1506 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 35,868 psi | 82% | 1578 fps | 96.4% |
| Vihtavuori 3N37 | <<locked>> | 80% | 36,332 psi | 84% | 1542 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 96% | 38,130 psi | 88% | 1621 fps | 95.4% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 36,477 psi | 84% | 1657 fps | 98.1% |
| Vihtavuori N320² | <<locked>> | 72% | 36,535 psi | 84% | 1378 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 31,908 psi | 73% | 1243 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 36,114 psi | 83% | 1437 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 39,204 psi | 90% | 1509 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 38,899 psi | 89% | 1572 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 37,536 psi | 86% | 1430 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 36,158 psi | 83% | 1444 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% | 23,801 psi | 55% | 1276 fps | 99.9% |
| Accurate No. 7*² | <<locked>> | 68% | 28,021 psi | 64% | 1473 fps | 87.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,280 psi | 58% | 1207 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,263 psi | 49% | 1194 fps | 100% |
| Accurate TCM* | <<locked>> | 80% | 32,503 psi | 75% | 1539 fps | 85.2% |
| ADI AP 100*² | 7.9 gr | 64% | 15,824 psi | 36% | 1135 fps | 86.6% |
| ADI AP 70N² | <<locked>> | 60% | 30,951 psi | 71% | 1368 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,643 psi | 61% | 1122 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 25,643 psi | 59% | 1138 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,208 psi | 58% | 1175 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 26,905 psi | 62% | 1247 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 21,959 psi | 50% | 1201 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 28,616 psi | 66% | 1470 fps | 86.3% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,282 psi | 63% | 1365 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,526 psi | 56% | 1211 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 15,592 psi | 36% | 1109 fps | 98.7% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 20,508 psi | 47% | 1293 fps | 90.3% |
| Alliant RED DOT² | <<locked>> | 60% | 24,294 psi | 56% | 1178 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 30,777 psi | 71% | 1424 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 21,422 psi | 49% | 1257 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 23,685 psi | 54% | 1191 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 15,287 psi | 35% | 1040 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,223 psi | 60% | 1253 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,263 psi | 49% | 1066 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,342 psi | 70% | 1450 fps | 99.2% |
| Hodgdon Longshot² | <<locked>> | 60% | 33,707 psi | 77% | 1499 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,876 psi | 18% | 768 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 25,498 psi | 59% | 1283 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 28,021 psi | 64% | 1473 fps | 87.2% |
| Lovex S011² | <<locked>> | 60% | 31,444 psi | 72% | 1332 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,367 psi | 58% | 1302 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,392 psi | 47% | 1171 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 21,654 psi | 50% | 1204 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,076 psi | 53% | 1201 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 24,918 psi | 57% | 1211 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,253 psi | 63% | 1198 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,690 psi | 71% | 1427 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 28,805 psi | 66% | 1302 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,498 psi | 17% | 771 fps | 99.3% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 19,928 psi | 46% | 1230 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 23,888 psi | 55% | 1371 fps | 86.8% |
| Rottweil P 801² | <<locked>> | 60% | 32,126 psi | 74% | 1316 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 15,084 psi | 35% | 1188 fps | 91% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 28,021 psi | 64% | 1473 fps | 87.2% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,189 psi | 46% | 1191 fps | 99.9% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,266 psi | 58% | 1250 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,424 psi | 56% | 1253 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,572 psi | 66% | 1184 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 60% | 17,216 psi | 40% | 1155 fps | 93.9% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,120 psi | 55% | 1253 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 22,524 psi | 52% | 1358 fps | 93.9% |
| Somchem MP200² | <<locked>> | 60% | 24,743 psi | 57% | 1316 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,394 psi | 51% | 1247 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 27,137 psi | 62% | 1421 fps | 92.5% |
| Vihtavuori 3N37² | <<locked>> | 60% | 19,740 psi | 45% | 1243 fps | 96.8% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 21,408 psi | 49% | 1312 fps | 85.9% |
| Vihtavuori N105*² | 10.7 gr | 76% | 17,738 psi | 41% | 1270 fps | 86.3% |
| Vihtavuori N320² | <<locked>> | 60% | 26,005 psi | 60% | 1237 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 13,329 psi | 31% | 928 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 24,831 psi | 57% | 1276 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 21,611 psi | 50% | 1240 fps | 100% |
| Vihtavuori N350² | 7.7 gr | 60% | 17,085 psi | 39% | 1175 fps | 95.3% |
| Winchester 231² | <<locked>> | 60% | 32,866 psi | 76% | 1371 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,118 psi | 49% | 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 64 powders for .357 Mag. loaded with the .357 | 125gr | Speer JHP. Vihtavuori N105 delivers the highest muzzle velocity at 1,657 fps; across all powders the maximum-charge window runs from 1,030 fps to 1,657 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 29 of the 64 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 37–90 %, 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 | Speer JHP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Accurate TCM, Alliant BLUE DOT burn incompletely and react more sensitively to barrel length and temperature. ADI APS 350, Alliant Herco, Baschieri & Pellagri 102 Pistol 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.