Load Specifications
Load data in caliber .357 Mag. with .355 | 125gr | Speer Hollow Point Gold Dot bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Rottweil P 806, SNPE Vectan BA7 1/2 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>> | 76% | 37,956 psi | 87% | 1470 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 35,041 psi | 81% | 1581 fps | 90.4% |
| Accurate Solo 1000² | <<locked>> | 76% | 35,998 psi | 83% | 1342 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 84% | 38,421 psi | 88% | 1434 fps | 100% |
| ADI AP 100ᴾ | <<locked>> | 100% | 38,348 psi | 88% | 1575 fps | 98.7% |
| ADI AP 70N² | <<locked>> | 68% | 36,448 psi | 84% | 1427 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 37,289 psi | 86% | 1243 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 39,233 psi | 90% | 1302 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 38,812 psi | 89% | 1342 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 38,841 psi | 89% | 1394 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 36,927 psi | 85% | 1401 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 36,854 psi | 85% | 1594 fps | 90.1% |
| Alliant BULLSEYE² | <<locked>> | 72% | 36,535 psi | 84% | 1490 fps | 100% |
| Alliant Green Dot | <<locked>> | 80% | 38,261 psi | 88% | 1391 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 39,175 psi | 90% | 1522 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 35,114 psi | 81% | 1578 fps | 97.5% |
| Alliant RED DOT | <<locked>> | 80% | 36,680 psi | 84% | 1342 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 68% | 37,275 psi | 86% | 1503 fps | 100% |
| Alliant UNIQUE | <<locked>> | 84% | 38,740 psi | 89% | 1526 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 38,464 psi | 88% | 1375 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 38,899 psi | 89% | 1391 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 35,578 psi | 82% | 1362 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 38,435 psi | 88% | 1289 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 68% | 38,276 psi | 88% | 1552 fps | 100% |
| Hodgdon Longshot² | <<locked>> | 64% | 36,883 psi | 85% | 1526 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 16,491 psi | 38% | 1010 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 37,289 psi | 86% | 1440 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 35,041 psi | 81% | 1581 fps | 90.4% |
| Lovex S011² | <<locked>> | 68% | 38,421 psi | 88% | 1404 fps | 100% |
| Lovex S020² | <<locked>> | 76% | 39,102 psi | 90% | 1476 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 36,085 psi | 83% | 1401 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 35,824 psi | 82% | 1401 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 37,144 psi | 85% | 1391 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 39,146 psi | 90% | 1391 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 36,013 psi | 83% | 1299 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 37,130 psi | 85% | 1503 fps | 100% |
| Ramshot True Blue² | <<locked>> | 64% | 38,159 psi | 88% | 1539 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 72% | 38,363 psi | 88% | 1414 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 15,098 psi | 35% | 1014 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 84% | 37,913 psi | 87% | 1503 fps | 100% |
| ReloadSwiss RS 24* | <<locked>> | 84% | 36,869 psi | 85% | 1598 fps | 93.6% |
| Rottweil P 801² | <<locked>> | 68% | 38,653 psi | 89% | 1381 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 35,940 psi | 83% | 1604 fps | 100% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 35,041 psi | 81% | 1581 fps | 90.4% |
| SNPE Vectan A0 | <<locked>> | 84% | 35,737 psi | 82% | 1437 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 37,362 psi | 86% | 1401 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 36,376 psi | 84% | 1414 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 37,362 psi | 86% | 1280 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 92% | 38,769 psi | 89% | 1535 fps | 100% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 38,841 psi | 89% | 1450 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 36,260 psi | 83% | 1601 fps | 98.9% |
| Somchem MP200² | <<locked>> | 76% | 37,478 psi | 86% | 1496 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 36,927 psi | 85% | 1463 fps | 100% |
| Somchem S221² | <<locked>> | 72% | 38,914 psi | 89% | 1601 fps | 96.8% |
| Vihtavuori 3N37 | <<locked>> | 84% | 38,348 psi | 88% | 1552 fps | 100% |
| Vihtavuori 3N38* | <<locked>> | 96% | 34,911 psi | 80% | 1552 fps | 93.5% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 33,576 psi | 77% | 1594 fps | 96.8% |
| Vihtavuori N320² | <<locked>> | 76% | 38,435 psi | 88% | 1385 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 30,574 psi | 70% | 1214 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 38,276 psi | 88% | 1447 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 37,318 psi | 86% | 1470 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 36,898 psi | 85% | 1529 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 35,447 psi | 81% | 1388 fps | 100% |
| Winchester AutoComp | <<locked>> | 84% | 37,797 psi | 87% | 1447 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% | 22,800 psi | 52% | 1240 fps | 99.7% |
| Accurate No. 7*² | <<locked>> | 68% | 26,397 psi | 61% | 1424 fps | 85.3% |
| Accurate Solo 1000² | <<locked>> | 60% | 23,902 psi | 55% | 1171 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 20,682 psi | 48% | 1171 fps | 100% |
| ADI AP 100*² | <<locked>> | 68% | 16,882 psi | 39% | 1152 fps | 87.2% |
| ADI AP 70N² | <<locked>> | 60% | 29,283 psi | 67% | 1329 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,513 psi | 61% | 1106 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 24,990 psi | 57% | 1115 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 23,670 psi | 54% | 1135 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 25,570 psi | 59% | 1214 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 21,118 psi | 49% | 1171 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 92% | 29,805 psi | 69% | 1476 fps | 86.3% |
| Alliant BULLSEYE² | <<locked>> | 60% | 26,208 psi | 60% | 1329 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 23,815 psi | 55% | 1184 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 14,779 psi | 34% | 1073 fps | 97.9% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 19,450 psi | 45% | 1253 fps | 88.6% |
| Alliant RED DOT² | <<locked>> | 60% | 23,322 psi | 54% | 1148 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 30,023 psi | 69% | 1394 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 20,392 psi | 47% | 1220 fps | 99.9% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 23,148 psi | 53% | 1168 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 14,344 psi | 33% | 1010 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 24,889 psi | 57% | 1220 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,089 psi | 48% | 1050 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 29,211 psi | 67% | 1414 fps | 98.7% |
| Hodgdon Longshot² | <<locked>> | 60% | 31,836 psi | 73% | 1453 fps | 99.8% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,716 psi | 18% | 755 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 24,352 psi | 56% | 1250 fps | 100% |
| Lovex D037.1*² | <<locked>> | 68% | 26,397 psi | 61% | 1424 fps | 85.3% |
| Lovex S011² | <<locked>> | 60% | 30,458 psi | 70% | 1302 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 23,670 psi | 54% | 1257 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 19,232 psi | 44% | 1135 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 20,987 psi | 48% | 1181 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 21,799 psi | 50% | 1165 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 23,525 psi | 54% | 1175 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 26,469 psi | 61% | 1171 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 29,080 psi | 67% | 1385 fps | 100% |
| Ramshot True Blue² | <<locked>> | 60% | 32,953 psi | 76% | 1463 fps | 99.9% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 27,586 psi | 63% | 1273 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,078 psi | 16% | 741 fps | 98.6% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 18,913 psi | 43% | 1198 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 72% | 25,469 psi | 59% | 1391 fps | 87.3% |
| Rottweil P 801² | <<locked>> | 60% | 31,096 psi | 71% | 1289 fps | 100% |
| Rottweil P 806*² | 10 gr | 60% | 13,750 psi | 32% | 1142 fps | 88.8% |
| Shooters World Major Pistol*² | <<locked>> | 68% | 26,397 psi | 61% | 1424 fps | 85.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 19,305 psi | 44% | 1158 fps | 99.7% |
| SNPE Vectan A1² | <<locked>> | 60% | 23,902 psi | 55% | 1211 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 23,061 psi | 53% | 1214 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,065 psi | 65% | 1161 fps | 100% |
| SNPE Vectan BA7 1/2*² | 7.3 gr | 60% | 16,259 psi | 37% | 1115 fps | 92.5% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 22,481 psi | 52% | 1207 fps | 100% |
| SNPE Vectan SP 2*² | <<locked>> | 60% | 20,914 psi | 48% | 1309 fps | 92.2% |
| Somchem MP200² | <<locked>> | 60% | 23,380 psi | 54% | 1276 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 21,422 psi | 49% | 1214 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 25,715 psi | 59% | 1375 fps | 91% |
| Vihtavuori 3N37² | <<locked>> | 60% | 18,681 psi | 43% | 1204 fps | 95.7% |
| Vihtavuori 3N38* | <<locked>> | 80% | 22,336 psi | 51% | 1316 fps | 86% |
| Vihtavuori N105* | <<locked>> | 80% | 18,405 psi | 42% | 1276 fps | 86.4% |
| Vihtavuori N320² | <<locked>> | 60% | 25,324 psi | 58% | 1214 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 12,502 psi | 29% | 899 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 23,699 psi | 54% | 1247 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 20,682 psi | 48% | 1207 fps | 100% |
| Vihtavuori N350*² | 7.1 gr | 60% | 15,940 psi | 37% | 1129 fps | 93.8% |
| Winchester 231² | <<locked>> | 60% | 31,401 psi | 72% | 1335 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 19,870 psi | 46% | 1168 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 .355 | 125gr | Speer Hollow Point Gold Dot. Rottweil P 806 delivers the highest muzzle velocity at 1,604 fps; across all powders the maximum-charge window runs from 1,010 fps to 1,604 fps. ADI AP 100 gives the best case fill at 100 %, and 34 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 35–90 %, 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, SNPE Vectan BA7 1/2, Vihtavuori N350 rank at the top here: for .357 Mag. with the .355 | 125gr | Speer Hollow Point Gold Dot 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 APS 350, ADI APS 450, 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.