Load Specifications
Load data in caliber .357 Mag. with .356 | 148gr | Rim Rock TC bullet and 67 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N105, Vihtavuori N350 and ADI AP 100.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 72% | 35,099 psi | 81% | 1286 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 37,260 psi | 86% | 1467 fps | 93.6% |
| Accurate No. 9* | <<locked>> | 84% | 36,637 psi | 84% | 1447 fps | 87.6% |
| Accurate Solo 1000² | <<locked>> | 76% | 36,912 psi | 85% | 1207 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 36,738 psi | 84% | 1263 fps | 100% |
| Accurate TCM* | <<locked>> | 84% | 36,492 psi | 84% | 1437 fps | 89% |
| ADI AP 100 | <<locked>> | 96% | 36,361 psi | 84% | 1398 fps | 99.3% |
| ADI AP 70N² | <<locked>> | 68% | 38,522 psi | 89% | 1296 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 39,102 psi | 90% | 1129 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 37,797 psi | 87% | 1148 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 36,506 psi | 84% | 1175 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 36,187 psi | 83% | 1217 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 37,985 psi | 87% | 1266 fps | 100% |
| Alliant BLUE DOT*ᴾ | <<locked>> | 100% | 38,885 psi | 89% | 1476 fps | 93.2% |
| Alliant BULLSEYE² | <<locked>> | 72% | 38,522 psi | 89% | 1355 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 36,651 psi | 84% | 1224 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 37,826 psi | 87% | 1352 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 37,420 psi | 86% | 1457 fps | 99.2% |
| Alliant RED DOT | <<locked>> | 80% | 38,334 psi | 88% | 1214 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 34,867 psi | 80% | 1316 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,086 psi | 85% | 1345 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 36,303 psi | 83% | 1204 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 37,594 psi | 86% | 1234 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 37,405 psi | 86% | 1240 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 39,073 psi | 90% | 1161 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 35,186 psi | 81% | 1358 fps | 100% |
| Hodgdon Longshot² | <<locked>> | 64% | 38,406 psi | 88% | 1391 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,027 psi | 39% | 909 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 35,679 psi | 82% | 1266 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 37,260 psi | 86% | 1467 fps | 93.6% |
| Lovex D037.2* | <<locked>> | 84% | 38,247 psi | 88% | 1467 fps | 88.4% |
| Lovex S011² | <<locked>> | 68% | 39,073 psi | 90% | 1260 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 36,927 psi | 85% | 1299 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 37,362 psi | 86% | 1266 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 37,173 psi | 85% | 1266 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 37,869 psi | 87% | 1247 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 37,550 psi | 86% | 1224 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,507 psi | 86% | 1175 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 68% | 38,783 psi | 89% | 1365 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 36,622 psi | 84% | 1240 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 15,679 psi | 36% | 915 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 35,708 psi | 82% | 1322 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 84% | 39,059 psi | 90% | 1476 fps | 96.2% |
| Rottweil P 801² | <<locked>> | 64% | 36,695 psi | 84% | 1211 fps | 100% |
| Rottweil P 806 | <<locked>> | 88% | 38,464 psi | 88% | 1480 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 84% | 38,247 psi | 88% | 1467 fps | 88.4% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 37,260 psi | 86% | 1467 fps | 93.6% |
| SNPE Vectan A0 | <<locked>> | 84% | 37,492 psi | 86% | 1306 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 38,899 psi | 89% | 1270 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 37,942 psi | 87% | 1280 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 38,769 psi | 89% | 1158 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,231 psi | 86% | 1365 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 36,608 psi | 84% | 1270 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 38,464 psi | 88% | 1473 fps | 99.9% |
| Somchem MP200² | <<locked>> | 76% | 38,740 psi | 89% | 1355 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,595 psi | 89% | 1329 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 35,476 psi | 82% | 1404 fps | 97.4% |
| Vihtavuori 3N37 | <<locked>> | 80% | 36,651 psi | 84% | 1375 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 96% | 37,173 psi | 85% | 1437 fps | 96.2% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 36,782 psi | 85% | 1486 fps | 99% |
| Vihtavuori N320² | <<locked>> | 72% | 36,898 psi | 85% | 1220 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 31,966 psi | 73% | 1096 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 35,882 psi | 82% | 1266 fps | 100% |
| Vihtavuori N340 | <<locked>> | 80% | 38,406 psi | 88% | 1325 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 38,392 psi | 88% | 1391 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 37,347 psi | 86% | 1260 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 36,013 psi | 83% | 1273 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% | 24,163 psi | 56% | 1135 fps | 100% |
| Accurate No. 7*² | <<locked>> | 64% | 23,960 psi | 55% | 1250 fps | 86.3% |
| Accurate No. 9* | <<locked>> | 80% | 32,242 psi | 74% | 1381 fps | 85.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,164 psi | 58% | 1063 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,582 psi | 50% | 1063 fps | 100% |
| Accurate TCM* | <<locked>> | 80% | 32,111 psi | 74% | 1375 fps | 86.8% |
| ADI AP 100*² | 6.3 gr | 60% | 13,996 psi | 32% | 965 fps | 86.3% |
| ADI AP 70N² | <<locked>> | 60% | 30,400 psi | 70% | 1201 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,137 psi | 62% | 991 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 25,918 psi | 60% | 1007 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 24,627 psi | 57% | 1027 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 26,310 psi | 60% | 1093 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 21,886 psi | 50% | 1060 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 84% | 25,498 psi | 59% | 1263 fps | 86.1% |
| Alliant BULLSEYE² | <<locked>> | 60% | 27,673 psi | 64% | 1214 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,424 psi | 56% | 1066 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 15,519 psi | 36% | 984 fps | 99.4% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 20,755 psi | 48% | 1165 fps | 92.3% |
| Alliant RED DOT² | <<locked>> | 60% | 24,279 psi | 56% | 1037 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 31,343 psi | 72% | 1270 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 21,524 psi | 49% | 1115 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,018 psi | 55% | 1056 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 15,461 psi | 36% | 925 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,049 psi | 60% | 1109 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,683 psi | 50% | 945 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 30,705 psi | 71% | 1296 fps | 99.8% |
| Hodgdon Longshot² | <<locked>> | 60% | 33,533 psi | 77% | 1329 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,006 psi | 18% | 686 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 25,628 psi | 59% | 1135 fps | 100% |
| Lovex D037.1*² | <<locked>> | 64% | 23,960 psi | 55% | 1250 fps | 86.3% |
| Lovex D037.2* | <<locked>> | 80% | 32,924 psi | 76% | 1391 fps | 85.7% |
| Lovex S011² | <<locked>> | 60% | 31,241 psi | 72% | 1175 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,367 psi | 58% | 1152 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,030 psi | 46% | 1030 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 22,104 psi | 51% | 1070 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,192 psi | 53% | 1063 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 24,932 psi | 57% | 1070 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,789 psi | 64% | 1063 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,530 psi | 70% | 1263 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 28,514 psi | 66% | 1145 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,353 psi | 17% | 676 fps | 99.7% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 19,696 psi | 45% | 1089 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 64% | 21,190 psi | 49% | 1175 fps | 86.6% |
| Rottweil P 801² | <<locked>> | 60% | 32,140 psi | 74% | 1161 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 14,953 psi | 34% | 1070 fps | 93.1% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 32,924 psi | 76% | 1391 fps | 85.7% |
| Shooters World Major Pistol*² | <<locked>> | 64% | 23,960 psi | 55% | 1250 fps | 86.3% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,334 psi | 47% | 1060 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,295 psi | 58% | 1106 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,453 psi | 56% | 1109 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 28,456 psi | 65% | 1040 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 17,056 psi | 39% | 1027 fps | 95.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 23,627 psi | 54% | 1099 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 22,336 psi | 51% | 1214 fps | 95.4% |
| Somchem MP200² | <<locked>> | 60% | 24,482 psi | 56% | 1161 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,640 psi | 52% | 1109 fps | 100% |
| Somchem S221*² | <<locked>> | 60% | 27,383 psi | 63% | 1276 fps | 94.2% |
| Vihtavuori 3N37² | <<locked>> | 60% | 19,928 psi | 46% | 1112 fps | 98% |
| Vihtavuori 3N38*² | <<locked>> | 72% | 18,811 psi | 43% | 1115 fps | 85.4% |
| Vihtavuori N105*² | 8.6 gr | 72% | 15,447 psi | 36% | 1079 fps | 85.8% |
| Vihtavuori N320² | <<locked>> | 60% | 26,397 psi | 61% | 1096 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 13,474 psi | 31% | 823 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,295 psi | 58% | 1135 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,046 psi | 51% | 1106 fps | 100% |
| Vihtavuori N350² | 6.6 gr | 60% | 17,260 psi | 40% | 1053 fps | 96.8% |
| Winchester 231² | <<locked>> | 60% | 32,779 psi | 75% | 1211 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,219 psi | 49% | 1070 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 67 powders for .357 Mag. loaded with the .356 | 148gr | Rim Rock TC. Vihtavuori N105 delivers the highest muzzle velocity at 1,486 fps; across all powders the maximum-charge window runs from 909 fps to 1,486 fps. Alliant BLUE DOT gives the best case fill at 100 %, and 32 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 36–90 %, leaving at least 10 % headroom. Alliant BLUE DOT, 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 N105, Vihtavuori N350, ADI AP 100 rank at the top here: for .357 Mag. with the .356 | 148gr | Rim Rock TC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 7, Accurate No. 9, Accurate TCM burn incompletely and react more sensitively to barrel length and temperature. Accurate Solo 1000, Accurate Solo 1250, ADI AP 100 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.