Load Specifications
Load data in caliber .357 Mag. with .358 | 148gr | Speer LBBWC bullet and 68 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% | 35,926 psi | 83% | 1319 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 38,276 psi | 88% | 1509 fps | 94.7% |
| Accurate No. 9* | <<locked>> | 84% | 37,840 psi | 87% | 1493 fps | 89.1% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,260 psi | 86% | 1234 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,449 psi | 86% | 1293 fps | 100% |
| Accurate TCM* | <<locked>> | 84% | 37,898 psi | 87% | 1490 fps | 90.5% |
| ADI AP 100 | <<locked>> | 96% | 37,101 psi | 85% | 1434 fps | 99.6% |
| ADI AP 70N² | <<locked>> | 68% | 38,653 psi | 89% | 1325 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 38,928 psi | 89% | 1152 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,333 psi | 86% | 1165 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 36,738 psi | 84% | 1201 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 36,143 psi | 83% | 1240 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 38,682 psi | 89% | 1296 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 36,143 psi | 83% | 1467 fps | 92.8% |
| Alliant BULLSEYE² | <<locked>> | 68% | 34,766 psi | 80% | 1335 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,521 psi | 84% | 1247 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 37,884 psi | 87% | 1378 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 38,479 psi | 88% | 1496 fps | 99.6% |
| Alliant RED DOT | <<locked>> | 80% | 38,508 psi | 89% | 1240 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 35,665 psi | 82% | 1348 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,086 psi | 85% | 1371 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,130 psi | 85% | 1237 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 38,101 psi | 88% | 1260 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,318 psi | 86% | 1260 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 76% | 37,405 psi | 86% | 1306 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 39,334 psi | 90% | 1184 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 35,288 psi | 81% | 1385 fps | 100% |
| Hodgdon Longshot² | <<locked>> | 64% | 39,349 psi | 90% | 1424 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 16,911 psi | 39% | 932 fps | 100% |
| Hodgdon Universal² | <<locked>> | 76% | 38,653 psi | 89% | 1325 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 38,276 psi | 88% | 1509 fps | 94.7% |
| Lovex D037.2* | <<locked>> | 84% | 38,624 psi | 89% | 1503 fps | 89.5% |
| Lovex S011² | <<locked>> | 64% | 36,245 psi | 83% | 1253 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 37,173 psi | 85% | 1325 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,811 psi | 87% | 1293 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 37,391 psi | 86% | 1289 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 38,696 psi | 89% | 1280 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,710 psi | 87% | 1250 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 38,029 psi | 87% | 1204 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 35,230 psi | 81% | 1348 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 35,969 psi | 83% | 1260 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 15,156 psi | 35% | 935 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 35,955 psi | 83% | 1345 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 80% | 35,259 psi | 81% | 1453 fps | 95.6% |
| Rottweil P 801² | <<locked>> | 64% | 36,085 psi | 83% | 1230 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 39,363 psi | 90% | 1512 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 84% | 38,624 psi | 89% | 1503 fps | 89.5% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 38,276 psi | 88% | 1509 fps | 94.7% |
| SNPE Vectan A0 | <<locked>> | 84% | 38,595 psi | 89% | 1339 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 39,102 psi | 90% | 1296 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 38,232 psi | 88% | 1306 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,261 psi | 88% | 1175 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,275 psi | 86% | 1391 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 36,999 psi | 85% | 1299 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 39,131 psi | 90% | 1509 fps | 100% |
| Somchem MP200² | <<locked>> | 72% | 35,157 psi | 81% | 1339 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,696 psi | 89% | 1355 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 36,085 psi | 83% | 1440 fps | 98% |
| Vihtavuori 3N37 | <<locked>> | 80% | 36,854 psi | 85% | 1407 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 92% | 36,985 psi | 85% | 1463 fps | 96.8% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 37,695 psi | 87% | 1522 fps | 99.4% |
| Vihtavuori N320² | <<locked>> | 72% | 36,448 psi | 84% | 1240 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 36,941 psi | 85% | 1171 fps | 100% |
| Vihtavuori N330² | <<locked>> | 76% | 38,986 psi | 90% | 1322 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 38,334 psi | 88% | 1352 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 37,739 psi | 87% | 1411 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 37,898 psi | 87% | 1289 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 36,463 psi | 84% | 1302 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% | 24,410 psi | 56% | 1165 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 24,395 psi | 56% | 1283 fps | 87.4% |
| Accurate No. 9* | <<locked>> | 80% | 32,808 psi | 75% | 1417 fps | 86.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,193 psi | 58% | 1086 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,219 psi | 49% | 1079 fps | 100% |
| Accurate TCM*² | <<locked>> | 76% | 28,398 psi | 65% | 1345 fps | 85.5% |
| ADI AP 100*² | 6.8 gr | 60% | 13,605 psi | 31% | 978 fps | 86.4% |
| ADI AP 70N² | <<locked>> | 60% | 29,994 psi | 69% | 1224 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,745 psi | 61% | 1007 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,121 psi | 60% | 1030 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 24,497 psi | 56% | 1050 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 26,658 psi | 61% | 1122 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 21,640 psi | 50% | 1079 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 26,005 psi | 60% | 1299 fps | 87.3% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,050 psi | 64% | 1240 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,018 psi | 55% | 1086 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 15,055 psi | 35% | 1001 fps | 99.4% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 20,247 psi | 47% | 1178 fps | 92.5% |
| Alliant RED DOT² | <<locked>> | 60% | 23,366 psi | 54% | 1050 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,415 psi | 72% | 1293 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 21,335 psi | 49% | 1138 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 23,641 psi | 54% | 1073 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 14,765 psi | 34% | 935 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 25,773 psi | 59% | 1125 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 23,786 psi | 55% | 1132 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,219 psi | 49% | 958 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,922 psi | 71% | 1325 fps | 99.9% |
| Hodgdon Longshot² | <<locked>> | 60% | 33,779 psi | 78% | 1358 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 6,875 psi | 16% | 676 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 25,411 psi | 58% | 1158 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 24,395 psi | 56% | 1283 fps | 87.4% |
| Lovex D037.2* | <<locked>> | 80% | 33,475 psi | 77% | 1427 fps | 87% |
| Lovex S011² | <<locked>> | 60% | 31,647 psi | 73% | 1201 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,193 psi | 58% | 1175 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,218 psi | 46% | 1056 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 21,277 psi | 49% | 1083 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 22,960 psi | 53% | 1079 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 24,801 psi | 57% | 1089 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,818 psi | 64% | 1083 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,632 psi | 70% | 1289 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 28,195 psi | 65% | 1168 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 6,324 psi | 15% | 673 fps | 99% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 19,667 psi | 45% | 1112 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 64% | 21,147 psi | 49% | 1198 fps | 87.3% |
| Rottweil P 801² | <<locked>> | 60% | 31,720 psi | 73% | 1181 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 14,040 psi | 32% | 1066 fps | 92.4% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 33,475 psi | 77% | 1427 fps | 87% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 24,395 psi | 56% | 1283 fps | 87.4% |
| SNPE Vectan A0² | <<locked>> | 60% | 19,841 psi | 46% | 1073 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,324 psi | 58% | 1125 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,526 psi | 56% | 1132 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,543 psi | 66% | 1063 fps | 100% |
| SNPE Vectan BA7 1/2² | 7.3 gr | 60% | 17,056 psi | 39% | 1050 fps | 95.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 23,699 psi | 54% | 1125 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 22,510 psi | 52% | 1243 fps | 96% |
| Somchem MP200² | <<locked>> | 60% | 24,801 psi | 57% | 1194 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,582 psi | 52% | 1135 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 26,890 psi | 62% | 1296 fps | 94.6% |
| Vihtavuori 3N37² | <<locked>> | 60% | 19,305 psi | 44% | 1125 fps | 98.1% |
| Vihtavuori 3N38*² | <<locked>> | 72% | 19,986 psi | 46% | 1168 fps | 87.4% |
| Vihtavuori N105*² | 9.3 gr | 72% | 15,142 psi | 35% | 1096 fps | 86.1% |
| Vihtavuori N320² | <<locked>> | 60% | 25,556 psi | 59% | 1109 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 14,373 psi | 33% | 866 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 24,236 psi | 56% | 1145 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 21,727 psi | 50% | 1125 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 17,753 psi | 41% | 1089 fps | 97.6% |
| Winchester 231² | <<locked>> | 60% | 33,504 psi | 77% | 1240 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 20,813 psi | 48% | 1086 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 15 powders for .357 Mag. loaded with the .358 | 148gr | Speer LBBWC. Vihtavuori N105 delivers the highest muzzle velocity at 1,522 fps; across all powders the maximum-charge window runs from 932 fps to 1,522 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 15 of the 15 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. 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 .358 | 148gr | Speer LBBWC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant BLUE DOT burn incompletely and react more sensitively to barrel length and temperature. Baschieri & Pellagri 102 Pistol, 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.