Load Specifications
Load data in caliber .357 Mag. with .355 | 125gr | X-TREME FP bullet and 63 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 SNPE Vectan BA7 1/2.
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% | 35,766 psi | 82% | 1440 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 38,276 psi | 88% | 1627 fps | 92.1% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,579 psi | 86% | 1362 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,579 psi | 86% | 1421 fps | 100% |
| ADI AP 100 | <<locked>> | 96% | 36,840 psi | 85% | 1552 fps | 98.5% |
| ADI AP 70N² | <<locked>> | 64% | 35,592 psi | 82% | 1407 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,696 psi | 89% | 1260 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,739 psi | 87% | 1286 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 37,130 psi | 85% | 1319 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 37,333 psi | 86% | 1371 fps | 100% |
| Alliant BE-86² | <<locked>> | 76% | 35,607 psi | 82% | 1381 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 36,535 psi | 84% | 1588 fps | 90.1% |
| Alliant BULLSEYE² | <<locked>> | 72% | 39,059 psi | 90% | 1519 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 37,695 psi | 87% | 1378 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 38,928 psi | 89% | 1512 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 38,392 psi | 88% | 1624 fps | 98.4% |
| Alliant RED DOT | <<locked>> | 80% | 38,841 psi | 89% | 1362 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 35,650 psi | 82% | 1476 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,594 psi | 86% | 1503 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,623 psi | 86% | 1362 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 38,247 psi | 88% | 1381 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,884 psi | 87% | 1385 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 37,086 psi | 85% | 1273 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 35,534 psi | 82% | 1509 fps | 99.8% |
| Hodgdon Longshot² | <<locked>> | 64% | 39,247 psi | 90% | 1555 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 18,753 psi | 43% | 1037 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 36,434 psi | 84% | 1421 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 38,276 psi | 88% | 1627 fps | 92.1% |
| Lovex S011² | <<locked>> | 64% | 35,476 psi | 82% | 1368 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 37,550 psi | 86% | 1453 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,884 psi | 87% | 1421 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 38,479 psi | 88% | 1424 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 38,943 psi | 90% | 1407 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 38,174 psi | 88% | 1375 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,898 psi | 87% | 1319 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 34,998 psi | 80% | 1470 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 37,652 psi | 87% | 1394 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,608 psi | 40% | 1050 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 36,535 psi | 84% | 1483 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 80% | 35,636 psi | 82% | 1575 fps | 93.3% |
| Rottweil P 801² | <<locked>> | 64% | 37,710 psi | 87% | 1362 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 36,143 psi | 83% | 1601 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 38,276 psi | 88% | 1627 fps | 92.1% |
| SNPE Vectan A0 | <<locked>> | 84% | 38,029 psi | 87% | 1463 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 38,798 psi | 89% | 1417 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 37,797 psi | 87% | 1427 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,595 psi | 89% | 1296 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,304 psi | 86% | 1516 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 37,289 psi | 86% | 1427 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 72% | 34,969 psi | 80% | 1575 fps | 98.8% |
| Somchem MP200² | <<locked>> | 72% | 36,230 psi | 83% | 1476 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,711 psi | 89% | 1483 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 36,767 psi | 85% | 1565 fps | 96.3% |
| Vihtavuori 3N37 | <<locked>> | 80% | 36,999 psi | 85% | 1532 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 96% | 38,174 psi | 88% | 1598 fps | 95% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 37,318 psi | 86% | 1647 fps | 98% |
| Vihtavuori N320² | <<locked>> | 72% | 37,666 psi | 87% | 1371 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,808 psi | 75% | 1234 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 36,782 psi | 85% | 1424 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 39,218 psi | 90% | 1490 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 35,534 psi | 82% | 1506 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 38,072 psi | 88% | 1417 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 36,695 psi | 84% | 1427 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% | 24,656 psi | 57% | 1270 fps | 99.9% |
| Accurate No. 7*² | <<locked>> | 68% | 29,037 psi | 67% | 1473 fps | 87.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,686 psi | 59% | 1194 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 22,133 psi | 51% | 1188 fps | 100% |
| ADI AP 100*² | 7.1 gr | 60% | 15,273 psi | 35% | 1093 fps | 85.6% |
| ADI AP 70N² | <<locked>> | 60% | 31,763 psi | 73% | 1355 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,354 psi | 63% | 1112 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,527 psi | 61% | 1135 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,817 psi | 59% | 1161 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,746 psi | 64% | 1237 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 23,221 psi | 53% | 1201 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 88% | 30,037 psi | 69% | 1476 fps | 86.8% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,050 psi | 64% | 1355 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 25,324 psi | 58% | 1201 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,940 psi | 39% | 1115 fps | 99.2% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 21,437 psi | 49% | 1293 fps | 90.7% |
| Alliant RED DOT² | <<locked>> | 60% | 24,903 psi | 57% | 1165 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,763 psi | 73% | 1421 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 22,756 psi | 52% | 1257 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,511 psi | 56% | 1181 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 16,534 psi | 38% | 1043 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,818 psi | 62% | 1240 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,046 psi | 51% | 1060 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 31,560 psi | 73% | 1447 fps | 99.3% |
| Hodgdon Longshot² | <<locked>> | 60% | 34,258 psi | 79% | 1486 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 9,514 psi | 22% | 791 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,818 psi | 62% | 1276 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 29,037 psi | 67% | 1473 fps | 87.4% |
| Lovex S011² | <<locked>> | 60% | 32,155 psi | 74% | 1322 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 26,020 psi | 60% | 1289 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 21,306 psi | 49% | 1165 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 23,119 psi | 53% | 1204 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,844 psi | 55% | 1191 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,541 psi | 59% | 1201 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 28,500 psi | 66% | 1194 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,864 psi | 71% | 1407 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 30,487 psi | 70% | 1299 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 8,978 psi | 21% | 787 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 21,103 psi | 49% | 1234 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 24,787 psi | 57% | 1368 fps | 87.1% |
| Rottweil P 801² | <<locked>> | 60% | 33,736 psi | 78% | 1312 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 17,013 psi | 39% | 1220 fps | 93% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 29,037 psi | 67% | 1473 fps | 87.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 21,074 psi | 48% | 1188 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,556 psi | 59% | 1234 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,743 psi | 57% | 1237 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,761 psi | 66% | 1168 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7.5 gr | 60% | 18,086 psi | 42% | 1152 fps | 94.4% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 24,555 psi | 56% | 1237 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 24,076 psi | 55% | 1368 fps | 94.6% |
| Somchem MP200² | <<locked>> | 60% | 26,078 psi | 60% | 1316 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 23,453 psi | 54% | 1247 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 28,413 psi | 65% | 1421 fps | 92.9% |
| Vihtavuori 3N37² | <<locked>> | 60% | 20,740 psi | 48% | 1240 fps | 97.1% |
| Vihtavuori 3N38*² | <<locked>> | 76% | 22,481 psi | 52% | 1312 fps | 86.4% |
| Vihtavuori N105*² | 10.2 gr | 76% | 18,942 psi | 44% | 1280 fps | 87.3% |
| Vihtavuori N320² | <<locked>> | 60% | 26,919 psi | 62% | 1227 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,939 psi | 34% | 935 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 26,005 psi | 60% | 1273 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,814 psi | 52% | 1237 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 18,420 psi | 42% | 1184 fps | 96.1% |
| Winchester 231² | <<locked>> | 60% | 34,055 psi | 78% | 1365 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 22,031 psi | 51% | 1198 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 63 powders for .357 Mag. loaded with the .355 | 125gr | X-TREME FP. Vihtavuori N105 delivers the highest muzzle velocity at 1,647 fps; across all powders the maximum-charge window runs from 1,037 fps to 1,647 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 27 of the 63 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, SNPE Vectan BA7 1/2 rank at the top here: for .357 Mag. with the .355 | 125gr | X-TREME FP 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, ADI APS 350, Alliant Herco 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.