Load Specifications
Load data in caliber .357 Auto Mag. with .356 | 125gr | H&N HP HS bullet and 95 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 6.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 64% | 31,981 psi | 86% | 1558 fps | 100% |
| Accurate No. 2² | <<locked>> | 64% | 32,735 psi | 89% | 1558 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 30,864 psi | 83% | 1693 fps | 93.1% |
| Accurate No. 7*² | <<locked>> | 64% | 31,836 psi | 86% | 1699 fps | 93.4% |
| Accurate No. 9*² | <<locked>> | 72% | 32,343 psi | 87% | 1699 fps | 88.2% |
| Accurate Solo 1000² | <<locked>> | 64% | 31,589 psi | 85% | 1437 fps | 100% |
| Accurate Solo 1000² | <<locked>> | 64% | 32,053 psi | 87% | 1430 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 31,488 psi | 85% | 1496 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 68% | 32,300 psi | 87% | 1499 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 31,589 psi | 85% | 1693 fps | 89.4% |
| Accurate TCM*² | <<locked>> | 72% | 32,503 psi | 88% | 1699 fps | 89.7% |
| ADI AP 100 | <<locked>> | 84% | 33,156 psi | 90% | 1677 fps | 99.6% |
| ADI AP 100 | <<locked>> | 80% | 30,574 psi | 83% | 1617 fps | 99.1% |
| ADI APS 350² | <<locked>> | 64% | 32,097 psi | 87% | 1332 fps | 100% |
| ADI APS 350² | <<locked>> | 64% | 32,851 psi | 89% | 1332 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 30,995 psi | 84% | 1348 fps | 100% |
| ADI APS 450² | <<locked>> | 64% | 31,241 psi | 84% | 1342 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 30,284 psi | 82% | 1385 fps | 100% |
| ADI AS 30² | <<locked>> | 64% | 31,560 psi | 85% | 1391 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 33,214 psi | 90% | 1480 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 32,445 psi | 88% | 1496 fps | 100% |
| Alliant BE-86² | <<locked>> | 68% | 33,025 psi | 89% | 1493 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 32,300 psi | 87% | 1713 fps | 92.7% |
| Alliant BLUE DOT* | <<locked>> | 84% | 33,098 psi | 89% | 1713 fps | 92.9% |
| Alliant Green Dot² | <<locked>> | 64% | 31,430 psi | 85% | 1444 fps | 100% |
| Alliant Green Dot² | <<locked>> | 64% | 31,357 psi | 85% | 1437 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 30,879 psi | 83% | 1565 fps | 100% |
| Alliant Herco | <<locked>> | 80% | 31,836 psi | 86% | 1565 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 32,343 psi | 87% | 1709 fps | 99.1% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 33,112 psi | 90% | 1713 fps | 99.2% |
| Alliant RED DOT² | <<locked>> | 68% | 32,227 psi | 87% | 1434 fps | 100% |
| Alliant RED DOT² | <<locked>> | 64% | 30,574 psi | 83% | 1394 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 31,734 psi | 86% | 1585 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 32,953 psi | 89% | 1591 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 30,763 psi | 83% | 1430 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 64% | 31,531 psi | 85% | 1430 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 33,402 psi | 90% | 1476 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 80% | 30,980 psi | 84% | 1430 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,328 psi | 85% | 1352 fps | 100% |
| Hodgdon Clays² | <<locked>> | 72% | 31,662 psi | 86% | 1345 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,334 psi | 52% | 1188 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 20,349 psi | 55% | 1191 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 32,735 psi | 89% | 1532 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 30,864 psi | 83% | 1693 fps | 93.1% |
| Lovex D037.1*² | <<locked>> | 64% | 31,836 psi | 86% | 1699 fps | 93.4% |
| Lovex D037.2*² | <<locked>> | 72% | 32,169 psi | 87% | 1709 fps | 88.3% |
| Lovex D037.2*² | <<locked>> | 72% | 33,214 psi | 90% | 1716 fps | 88.7% |
| Maxam CSB 1² | <<locked>> | 72% | 32,518 psi | 88% | 1509 fps | 100% |
| Maxam CSB 1² | <<locked>> | 72% | 33,402 psi | 90% | 1509 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 32,387 psi | 88% | 1503 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 33,127 psi | 90% | 1499 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 32,750 psi | 89% | 1486 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 33,460 psi | 90% | 1483 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,125 psi | 84% | 1437 fps | 100% |
| Maxam CSB 4² | <<locked>> | 64% | 31,763 psi | 86% | 1437 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 17,811 psi | 48% | 1198 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 19,145 psi | 52% | 1207 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 30,661 psi | 83% | 1555 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 68% | 31,705 psi | 86% | 1558 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 29,849 psi | 81% | 1657 fps | 94.6% |
| ReloadSwiss RS 24*² | <<locked>> | 68% | 30,400 psi | 82% | 1657 fps | 94.7% |
| Rottweil P 806² | <<locked>> | 72% | 29,892 psi | 81% | 1660 fps | 100% |
| Rottweil P 806² | <<locked>> | 72% | 31,589 psi | 85% | 1680 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 32,169 psi | 87% | 1709 fps | 88.3% |
| Shooters World Heavy Pistol*² | <<locked>> | 72% | 33,214 psi | 90% | 1716 fps | 88.7% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 30,864 psi | 83% | 1693 fps | 93.1% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 31,836 psi | 86% | 1699 fps | 93.4% |
| SNPE Vectan A0² | <<locked>> | 72% | 32,953 psi | 89% | 1558 fps | 100% |
| SNPE Vectan A0² | <<locked>> | 72% | 33,243 psi | 90% | 1552 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,024 psi | 87% | 1486 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 64% | 32,764 psi | 89% | 1486 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 31,299 psi | 85% | 1499 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 64% | 32,053 psi | 87% | 1499 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 32,300 psi | 87% | 1614 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 33,040 psi | 89% | 1617 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,024 psi | 84% | 1499 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 64% | 31,415 psi | 85% | 1493 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 32,285 psi | 87% | 1706 fps | 99.7% |
| Somchem MP200² | <<locked>> | 64% | 32,692 psi | 88% | 1594 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 32,605 psi | 88% | 1565 fps | 100% |
| Somchem MS200² | <<locked>> | 64% | 29,892 psi | 81% | 1506 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,053 psi | 84% | 1614 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 31,879 psi | 86% | 1614 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 30,139 psi | 81% | 1654 fps | 95.6% |
| Vihtavuori 3N38 | <<locked>> | 80% | 31,314 psi | 85% | 1663 fps | 96% |
| Vihtavuori N105 | <<locked>> | 84% | 30,240 psi | 82% | 1703 fps | 98.5% |
| Vihtavuori N105 | <<locked>> | 84% | 31,111 psi | 84% | 1709 fps | 98.7% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 33,373 psi | 90% | 1391 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 92% | 31,908 psi | 86% | 1358 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 32,880 psi | 89% | 1572 fps | 100% |
| Vihtavuori N340² | <<locked>> | 64% | 30,081 psi | 81% | 1512 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 30,356 psi | 82% | 1594 fps | 100% |
| Vihtavuori N350² | <<locked>> | 72% | 31,067 psi | 84% | 1594 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 30,545 psi | 83% | 1499 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 68% | 31,763 psi | 86% | 1506 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 6.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 28,413 psi | 77% | 1499 fps | 100% |
| Accurate No. 2² | <<locked>> | 60% | 28,558 psi | 77% | 1490 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 26,295 psi | 71% | 1594 fps | 90.3% |
| Accurate No. 7*² | <<locked>> | 60% | 27,601 psi | 75% | 1611 fps | 91% |
| Accurate No. 9*² | <<locked>> | 68% | 27,833 psi | 75% | 1608 fps | 85.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,195 psi | 76% | 1381 fps | 100% |
| Accurate Solo 1000² | <<locked>> | 60% | 28,616 psi | 77% | 1378 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,034 psi | 68% | 1391 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 25,788 psi | 70% | 1391 fps | 100% |
| Accurate TCM*² | <<locked>> | 68% | 27,064 psi | 73% | 1598 fps | 86.4% |
| Accurate TCM*² | <<locked>> | 68% | 28,355 psi | 77% | 1614 fps | 87.2% |
| ADI AP 100*² | <<locked>> | 60% | 16,592 psi | 45% | 1289 fps | 91.4% |
| ADI AP 100*² | <<locked>> | 60% | 17,550 psi | 47% | 1302 fps | 92.3% |
| ADI APS 350² | <<locked>> | 60% | 29,080 psi | 79% | 1286 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 29,805 psi | 81% | 1286 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,224 psi | 76% | 1306 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 28,456 psi | 77% | 1299 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,441 psi | 74% | 1339 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 28,108 psi | 76% | 1335 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 29,762 psi | 80% | 1424 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 25,585 psi | 69% | 1388 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 26,614 psi | 72% | 1391 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 22,582 psi | 61% | 1493 fps | 86.2% |
| Alliant BLUE DOT*² | <<locked>> | 72% | 23,714 psi | 64% | 1506 fps | 87% |
| Alliant Green Dot² | <<locked>> | 60% | 28,689 psi | 78% | 1398 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 28,572 psi | 77% | 1394 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 17,883 psi | 48% | 1293 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 19,102 psi | 52% | 1309 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,019 psi | 68% | 1549 fps | 96.5% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 25,701 psi | 69% | 1555 fps | 96.8% |
| Alliant RED DOT² | <<locked>> | 60% | 26,411 psi | 71% | 1339 fps | 100% |
| Alliant RED DOT² | <<locked>> | 60% | 27,688 psi | 75% | 1348 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 25,164 psi | 68% | 1467 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 26,310 psi | 71% | 1473 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 27,456 psi | 74% | 1378 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 28,166 psi | 76% | 1378 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,506 psi | 47% | 1198 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 18,507 psi | 50% | 1207 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 23,453 psi | 63% | 1220 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 24,236 psi | 66% | 1224 fps | 100% |
| Hodgdon TrailBoss² | 5.1 gr | 60% | 8,340 psi | 23% | 883 fps | 100% |
| Hodgdon TrailBoss² | 5.1 gr | 60% | 9,529 psi | 26% | 902 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 28,906 psi | 78% | 1473 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 26,295 psi | 71% | 1594 fps | 90.3% |
| Lovex D037.1*² | <<locked>> | 60% | 27,601 psi | 75% | 1611 fps | 91% |
| Lovex D037.2*² | <<locked>> | 68% | 27,644 psi | 75% | 1617 fps | 85.4% |
| Lovex D037.2*² | <<locked>> | 68% | 28,631 psi | 77% | 1624 fps | 85.9% |
| Maxam CSB 1² | <<locked>> | 60% | 23,395 psi | 63% | 1355 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 24,163 psi | 65% | 1355 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 25,367 psi | 69% | 1388 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 26,614 psi | 72% | 1394 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,194 psi | 71% | 1378 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 26,861 psi | 73% | 1378 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,326 psi | 77% | 1394 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 28,877 psi | 78% | 1391 fps | 100% |
| ReloadSwiss RS 14² | 5.2 gr | 60% | 7,629 psi | 21% | 876 fps | 100% |
| ReloadSwiss RS 14² | 5.2 gr | 60% | 9,021 psi | 24% | 906 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 24,149 psi | 65% | 1437 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 25,121 psi | 68% | 1444 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 22,278 psi | 60% | 1483 fps | 89.7% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 23,206 psi | 63% | 1493 fps | 90.3% |
| Rottweil P 806² | <<locked>> | 60% | 18,753 psi | 51% | 1411 fps | 97.2% |
| Rottweil P 806² | <<locked>> | 60% | 20,668 psi | 56% | 1447 fps | 98.3% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 27,644 psi | 75% | 1617 fps | 85.4% |
| Shooters World Heavy Pistol*² | <<locked>> | 68% | 28,631 psi | 77% | 1624 fps | 85.9% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 26,295 psi | 71% | 1594 fps | 90.3% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 27,601 psi | 75% | 1611 fps | 91% |
| SNPE Vectan A0² | <<locked>> | 60% | 23,308 psi | 63% | 1388 fps | 100% |
| SNPE Vectan A0² | <<locked>> | 60% | 24,033 psi | 65% | 1388 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 28,558 psi | 77% | 1430 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 29,254 psi | 79% | 1430 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 27,804 psi | 75% | 1444 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 28,543 psi | 77% | 1444 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 19,943 psi | 54% | 1362 fps | 98.4% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 20,958 psi | 57% | 1371 fps | 98.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 27,412 psi | 74% | 1437 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 28,268 psi | 76% | 1440 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 27,891 psi | 75% | 1621 fps | 98.9% |
| Somchem MP200² | <<locked>> | 60% | 29,124 psi | 79% | 1532 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 25,976 psi | 70% | 1450 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 26,890 psi | 73% | 1453 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 23,786 psi | 64% | 1470 fps | 99.9% |
| Vihtavuori 3N37² | <<locked>> | 60% | 24,598 psi | 67% | 1476 fps | 99.9% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 18,101 psi | 49% | 1362 fps | 86.8% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 16,752 psi | 45% | 1302 fps | 85.2% |
| Vihtavuori N105*² | <<locked>> | 64% | 14,837 psi | 40% | 1306 fps | 86.7% |
| Vihtavuori N105*² | <<locked>> | 60% | 13,837 psi | 37% | 1257 fps | 85.2% |
| Vihtavuori N32C Tin Star² | 6.8 gr | 60% | 14,721 psi | 40% | 1063 fps | 100% |
| Vihtavuori N32C Tin Star² | 6.8 gr | 60% | 15,751 psi | 43% | 1066 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 25,541 psi | 69% | 1447 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 26,513 psi | 72% | 1450 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 20,566 psi | 56% | 1391 fps | 99.3% |
| Vihtavuori N350² | <<locked>> | 60% | 21,654 psi | 59% | 1404 fps | 99.6% |
| Winchester AutoComp ² | <<locked>> | 60% | 24,250 psi | 66% | 1391 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 25,382 psi | 69% | 1398 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 95 powders for .357 Auto Mag. loaded with the .356 | 125gr | H&N HP HS. Lovex D037.2 delivers the highest muzzle velocity at 1,716 fps; across all powders the maximum-charge window runs from 1,188 fps to 1,716 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 18 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (255 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, Hodgdon TrailBoss, ReloadSwiss RS 14 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 Auto Mag. with the .356 | 125gr | H&N HP HS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Accurate No. 7, Accurate No. 9 burn incompletely and react more sensitively to barrel length and temperature. Hodgdon TrailBoss, Hodgdon TrailBoss, ReloadSwiss RS 14 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.