Load Specifications
Load data in caliber .357 Maximum with .355 | 147gr | X-TREME RP HP bullet and 64 powders. The key underlying parameters are shown in the table above.
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: 7.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4100* | <<locked>> | 84% | 38,914 psi | 87% | 1709 fps | 90.2% |
| Accurate No. 2² | <<locked>> | 64% | 36,941 psi | 82% | 1480 fps | 100% |
| Accurate No. 7² | <<locked>> | 64% | 38,551 psi | 86% | 1690 fps | 98.7% |
| Accurate No. 9² | <<locked>> | 72% | 39,015 psi | 87% | 1699 fps | 95.4% |
| Accurate Solo 1000² | <<locked>> | 68% | 38,537 psi | 86% | 1388 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 72% | 40,190 psi | 89% | 1463 fps | 100% |
| Accurate TCM² | <<locked>> | 72% | 38,928 psi | 87% | 1693 fps | 96.4% |
| ADI AP 100 | <<locked>> | 84% | 38,711 psi | 86% | 1617 fps | 100% |
| ADI APS 350² | <<locked>> | 68% | 37,492 psi | 83% | 1280 fps | 100% |
| ADI APS 450² | <<locked>> | 72% | 39,798 psi | 89% | 1339 fps | 100% |
| ADI AS 30² | <<locked>> | 68% | 37,318 psi | 83% | 1339 fps | 100% |
| ADI AS 50N² | <<locked>> | 64% | 38,058 psi | 85% | 1394 fps | 100% |
| Alliant 2400* | <<locked>> | 80% | 37,884 psi | 84% | 1706 fps | 92.7% |
| Alliant BE-86² | <<locked>> | 68% | 37,434 psi | 83% | 1414 fps | 100% |
| Alliant BLUE DOT | <<locked>> | 84% | 38,870 psi | 86% | 1690 fps | 98.2% |
| Alliant BULLSEYE² | <<locked>> | 64% | 40,640 psi | 90% | 1555 fps | 100% |
| Alliant Green Dot² | <<locked>> | 68% | 38,261 psi | 85% | 1401 fps | 100% |
| Alliant Herco | <<locked>> | 84% | 40,161 psi | 89% | 1542 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 68% | 38,421 psi | 85% | 1663 fps | 100% |
| Alliant Power Pro 300-MP* | <<locked>> | 88% | 39,726 psi | 88% | 1762 fps | 87.9% |
| Alliant RED DOT² | <<locked>> | 72% | 39,813 psi | 89% | 1391 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 68% | 37,144 psi | 83% | 1506 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 68% | 38,798 psi | 86% | 1391 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 84% | 38,638 psi | 86% | 1398 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 64% | 39,102 psi | 87% | 1407 fps | 100% |
| Hodgdon Clays | <<locked>> | 80% | 39,668 psi | 88% | 1332 fps | 100% |
| Hodgdon LilGun* | <<locked>> | 92% | 39,552 psi | 88% | 1814 fps | 94.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 23,554 psi | 52% | 1129 fps | 100% |
| Hodgdon Universal² | <<locked>> | 64% | 38,363 psi | 85% | 1453 fps | 100% |
| Lovex D037.1² | <<locked>> | 64% | 38,551 psi | 86% | 1690 fps | 98.7% |
| Lovex D037.2² | <<locked>> | 72% | 40,001 psi | 89% | 1716 fps | 95.8% |
| Lovex S020² | <<locked>> | 64% | 39,494 psi | 88% | 1486 fps | 100% |
| Maxam CSB 1² | <<locked>> | 76% | 40,669 psi | 90% | 1463 fps | 100% |
| Maxam CSB 2² | <<locked>> | 68% | 38,537 psi | 86% | 1427 fps | 100% |
| Maxam CSB 3² | <<locked>> | 68% | 36,927 psi | 82% | 1394 fps | 100% |
| Maxam CSB 4² | <<locked>> | 68% | 38,609 psi | 86% | 1394 fps | 100% |
| Maxam CSB 5² | <<locked>> | 64% | 38,101 psi | 85% | 1339 fps | 100% |
| Ramshot Enforcer* | <<locked>> | 80% | 37,666 psi | 84% | 1709 fps | 93.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 22,742 psi | 51% | 1152 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 72% | 40,495 psi | 90% | 1532 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 72% | 40,524 psi | 90% | 1703 fps | 99.8% |
| Rottweil P 806² | <<locked>> | 72% | 39,247 psi | 87% | 1647 fps | 100% |
| Shooters World Heavy Pistol² | <<locked>> | 72% | 40,001 psi | 89% | 1716 fps | 95.8% |
| Shooters World Major Pistol² | <<locked>> | 64% | 38,551 psi | 86% | 1690 fps | 98.7% |
| SNPE Vectan A0² | <<locked>> | 72% | 37,507 psi | 83% | 1470 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 68% | 39,914 psi | 89% | 1447 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 68% | 39,334 psi | 87% | 1460 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 64% | 37,188 psi | 83% | 1306 fps | 100% |
| SNPE Vectan BA6 1/2*ᴾ | <<locked>> | 100% | 29,805 psi | 66% | 1565 fps | 92.3% |
| SNPE Vectan BA7 1/2² | <<locked>> | 76% | 37,855 psi | 84% | 1549 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 68% | 39,537 psi | 88% | 1463 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 64% | 40,176 psi | 89% | 1673 fps | 100% |
| Somchem MP200² | <<locked>> | 64% | 38,116 psi | 85% | 1512 fps | 100% |
| Somchem MS200² | <<locked>> | 68% | 37,942 psi | 84% | 1486 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 68% | 36,999 psi | 82% | 1549 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 80% | 37,333 psi | 83% | 1640 fps | 99.7% |
| Vihtavuori N105 | <<locked>> | 84% | 38,624 psi | 86% | 1690 fps | 100% |
| Vihtavuori N110*ᴾ | <<locked>> | 100% | 37,753 psi | 84% | 1726 fps | 93.3% |
| Vihtavuori N320² | <<locked>> | 64% | 38,682 psi | 86% | 1394 fps | 100% |
| Vihtavuori N32C Tin Star | <<locked>> | 96% | 37,927 psi | 84% | 1306 fps | 100% |
| Vihtavuori N330² | <<locked>> | 64% | 39,436 psi | 88% | 1460 fps | 100% |
| Vihtavuori N340² | <<locked>> | 68% | 38,189 psi | 85% | 1490 fps | 100% |
| Vihtavuori N350² | <<locked>> | 76% | 40,205 psi | 89% | 1585 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 72% | 39,668 psi | 88% | 1473 fps | 100% |
Start Load - Barrel Length: 7.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4100*² | <<locked>> | 76% | 29,965 psi | 67% | 1555 fps | 85.5% |
| Accurate No. 2² | <<locked>> | 60% | 32,866 psi | 73% | 1424 fps | 100% |
| Accurate No. 7² | <<locked>> | 60% | 33,562 psi | 75% | 1608 fps | 97.5% |
| Accurate No. 9*² | <<locked>> | 60% | 25,628 psi | 57% | 1453 fps | 88.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 31,560 psi | 70% | 1296 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 29,051 psi | 65% | 1316 fps | 100% |
| Accurate TCM*² | <<locked>> | 60% | 25,831 psi | 57% | 1453 fps | 90.3% |
| ADI AP 100² | <<locked>> | 60% | 20,929 psi | 47% | 1293 fps | 98.1% |
| ADI APS 350² | <<locked>> | 60% | 31,560 psi | 70% | 1198 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 30,487 psi | 68% | 1214 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 30,951 psi | 69% | 1253 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 34,200 psi | 76% | 1342 fps | 100% |
| Alliant 2400*² | <<locked>> | 68% | 26,165 psi | 58% | 1483 fps | 86.2% |
| Alliant BE-86² | <<locked>> | 60% | 30,356 psi | 68% | 1319 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 60% | 19,943 psi | 44% | 1302 fps | 88.6% |
| Alliant BULLSEYE² | <<locked>> | 60% | 36,724 psi | 82% | 1499 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 31,386 psi | 70% | 1306 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 22,408 psi | 50% | 1260 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 60% | 29,950 psi | 67% | 1519 fps | 99.9% |
| Alliant Power Pro 300-MP* | <<locked>> | 84% | 34,925 psi | 78% | 1683 fps | 85.6% |
| Alliant RED DOT² | <<locked>> | 60% | 30,647 psi | 68% | 1266 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 30,269 psi | 67% | 1404 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 31,270 psi | 70% | 1293 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 21,843 psi | 49% | 1152 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 34,577 psi | 77% | 1355 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 26,107 psi | 58% | 1145 fps | 100% |
| Hodgdon LilGun* | <<locked>> | 80% | 26,266 psi | 58% | 1568 fps | 86.9% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 11,806 psi | 26% | 866 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 34,693 psi | 77% | 1404 fps | 100% |
| Lovex D037.1² | <<locked>> | 60% | 33,562 psi | 75% | 1608 fps | 97.5% |
| Lovex D037.2*² | <<locked>> | 60% | 26,397 psi | 59% | 1470 fps | 89.4% |
| Lovex S020² | <<locked>> | 60% | 34,940 psi | 78% | 1430 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 27,311 psi | 61% | 1280 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 31,227 psi | 69% | 1329 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 30,327 psi | 67% | 1302 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 32,256 psi | 72% | 1312 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 34,113 psi | 76% | 1286 fps | 100% |
| Ramshot Enforcer*² | <<locked>> | 68% | 25,251 psi | 56% | 1473 fps | 86.8% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 11,414 psi | 25% | 879 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 29,283 psi | 65% | 1381 fps | 100% |
| ReloadSwiss RS 24² | <<locked>> | 60% | 27,804 psi | 62% | 1486 fps | 96.9% |
| Rottweil P 806² | <<locked>> | 60% | 26,585 psi | 59% | 1453 fps | 100% |
| Shooters World Heavy Pistol*² | <<locked>> | 60% | 26,397 psi | 59% | 1470 fps | 89.4% |
| Shooters World Major Pistol² | <<locked>> | 60% | 33,562 psi | 75% | 1608 fps | 97.5% |
| SNPE Vectan A0² | <<locked>> | 60% | 27,702 psi | 62% | 1329 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 32,547 psi | 72% | 1352 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 31,908 psi | 71% | 1365 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 34,084 psi | 76% | 1266 fps | 100% |
| SNPE Vectan BA6 1/2* | <<locked>> | 88% | 22,162 psi | 49% | 1394 fps | 86.7% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 24,642 psi | 55% | 1335 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 31,836 psi | 71% | 1362 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 35,027 psi | 78% | 1598 fps | 100% |
| Somchem MP200² | <<locked>> | 60% | 34,055 psi | 76% | 1460 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 30,487 psi | 68% | 1381 fps | 100% |
| Vihtavuori 3N37² | <<locked>> | 60% | 29,196 psi | 65% | 1434 fps | 100% |
| Vihtavuori 3N38*² | <<locked>> | 60% | 20,668 psi | 46% | 1312 fps | 93.8% |
| Vihtavuori N105² | <<locked>> | 60% | 18,420 psi | 41% | 1306 fps | 95.9% |
| Vihtavuori N110* | <<locked>> | 88% | 26,614 psi | 59% | 1522 fps | 87.3% |
| Vihtavuori N320² | <<locked>> | 60% | 34,621 psi | 77% | 1342 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 18,855 psi | 42% | 1017 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 34,867 psi | 78% | 1401 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 30,429 psi | 68% | 1381 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 25,759 psi | 57% | 1368 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 29,196 psi | 65% | 1332 fps | 100% |
* 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 Maximum loaded with the .355 | 147gr | X-TREME RP HP. Hodgdon LilGun delivers the highest muzzle velocity at 1,814 fps; across all powders the maximum-charge window runs from 1,129 fps to 1,814 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 17 of the 64 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (310 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, SNPE Vectan BA6 1/2 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. As outliers, Accurate 4100, Alliant 2400, Alliant Power Pro 300-MP burn incompletely and react more sensitively to barrel length and temperature. 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.