Load Specifications
Load data in caliber .357 Mag. with .357 | 158gr | X-TREME RNFP 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: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 72% | 37,376 psi | 86% | 1253 fps | 100% |
| Accurate No. 7*² | <<locked>> | 72% | 36,013 psi | 83% | 1388 fps | 94.1% |
| Accurate No. 9* | <<locked>> | 80% | 35,549 psi | 82% | 1375 fps | 88.3% |
| Accurate Solo 1000² | <<locked>> | 72% | 35,607 psi | 82% | 1138 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 39,189 psi | 90% | 1230 fps | 100% |
| Accurate TCM* | <<locked>> | 80% | 35,940 psi | 83% | 1375 fps | 89.9% |
| ADI AP 100 | <<locked>> | 92% | 36,114 psi | 83% | 1335 fps | 99.6% |
| ADI AP 70N² | <<locked>> | 64% | 37,565 psi | 86% | 1224 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 36,883 psi | 85% | 1056 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 38,899 psi | 89% | 1109 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 38,421 psi | 88% | 1138 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 38,421 psi | 88% | 1181 fps | 100% |
| Alliant BE-86² | <<locked>> | 76% | 37,086 psi | 85% | 1198 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 38,870 psi | 89% | 1417 fps | 94.1% |
| Alliant BULLSEYE² | <<locked>> | 68% | 36,782 psi | 85% | 1273 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 38,928 psi | 89% | 1188 fps | 100% |
| Alliant Herco | <<locked>> | 92% | 37,739 psi | 87% | 1283 fps | 100% |
| Alliant POWER PISTOL² | <<locked>> | 76% | 36,361 psi | 84% | 1378 fps | 99.4% |
| Alliant RED DOT² | <<locked>> | 76% | 37,260 psi | 86% | 1145 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 37,057 psi | 85% | 1280 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 76% | 36,434 psi | 84% | 1273 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 72% | 35,549 psi | 82% | 1142 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 92% | 37,695 psi | 87% | 1175 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 68% | 35,505 psi | 82% | 1161 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 38,348 psi | 88% | 1102 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 38,247 psi | 88% | 1335 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 19,609 psi | 45% | 899 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 38,580 psi | 89% | 1234 fps | 100% |
| Lovex D037.1*² | <<locked>> | 72% | 36,013 psi | 83% | 1388 fps | 94.1% |
| Lovex D037.2* | <<locked>> | 80% | 37,014 psi | 85% | 1394 fps | 89% |
| Lovex S011² | <<locked>> | 64% | 37,869 psi | 87% | 1191 fps | 100% |
| Lovex S020² | <<locked>> | 68% | 34,882 psi | 80% | 1214 fps | 100% |
| Maxam CSB 1 | <<locked>> | 80% | 36,999 psi | 85% | 1201 fps | 100% |
| Maxam CSB 2² | <<locked>> | 76% | 37,536 psi | 86% | 1204 fps | 100% |
| Maxam CSB 3² | <<locked>> | 76% | 37,086 psi | 85% | 1181 fps | 100% |
| Maxam CSB 4² | <<locked>> | 72% | 35,607 psi | 82% | 1145 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 39,204 psi | 90% | 1135 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 37,217 psi | 86% | 1286 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 64% | 35,998 psi | 83% | 1171 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 18,536 psi | 43% | 909 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 38,696 psi | 89% | 1289 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 80% | 37,768 psi | 87% | 1398 fps | 96.6% |
| Rottweil P 806 | <<locked>> | 84% | 39,218 psi | 90% | 1421 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 37,014 psi | 85% | 1394 fps | 89% |
| Shooters World Major Pistol*² | <<locked>> | 72% | 36,013 psi | 83% | 1388 fps | 94.1% |
| SNPE Vectan A0 | <<locked>> | 80% | 37,144 psi | 85% | 1240 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 72% | 36,564 psi | 84% | 1188 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 72% | 35,737 psi | 82% | 1198 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 68% | 36,927 psi | 85% | 1089 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 84% | 36,143 psi | 83% | 1289 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 39,102 psi | 90% | 1237 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 72% | 37,434 psi | 86% | 1391 fps | 100% |
| Somchem MP200² | <<locked>> | 72% | 38,000 psi | 87% | 1283 fps | 100% |
| Somchem MS200² | <<locked>> | 76% | 37,463 psi | 86% | 1253 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 39,262 psi | 90% | 1391 fps | 98.8% |
| Vihtavuori 3N37² | <<locked>> | 76% | 35,592 psi | 82% | 1302 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 92% | 36,941 psi | 85% | 1375 fps | 97% |
| Vihtavuori N105 | <<locked>> | 96% | 36,941 psi | 85% | 1424 fps | 99.4% |
| Vihtavuori N320² | <<locked>> | 72% | 39,349 psi | 90% | 1184 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 34,519 psi | 79% | 1066 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 38,754 psi | 89% | 1234 fps | 100% |
| Vihtavuori N340² | <<locked>> | 76% | 37,362 psi | 86% | 1253 fps | 100% |
| Vihtavuori N350 | <<locked>> | 84% | 38,014 psi | 87% | 1322 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 38,914 psi | 89% | 1243 fps | 100% |
Start Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 60% | 26,107 psi | 60% | 1112 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 24,076 psi | 55% | 1194 fps | 87.5% |
| Accurate No. 9*² | <<locked>> | 76% | 31,430 psi | 72% | 1312 fps | 86.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 26,600 psi | 61% | 1030 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 23,511 psi | 54% | 1037 fps | 100% |
| Accurate TCM*² | <<locked>> | 72% | 27,572 psi | 63% | 1247 fps | 85.3% |
| ADI AP 100*² | <<locked>> | 60% | 16,375 psi | 38% | 978 fps | 90.4% |
| ADI AP 70N² | <<locked>> | 60% | 33,895 psi | 78% | 1181 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 27,992 psi | 64% | 955 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 26,861 psi | 62% | 971 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 27,122 psi | 62% | 1007 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 29,095 psi | 67% | 1073 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 24,787 psi | 57% | 1047 fps | 100% |
| Alliant BLUE DOT*² | <<locked>> | 76% | 23,250 psi | 53% | 1161 fps | 85.5% |
| Alliant BULLSEYE² | <<locked>> | 60% | 29,602 psi | 68% | 1181 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 27,093 psi | 62% | 1047 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 18,202 psi | 42% | 991 fps | 100% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 23,148 psi | 53% | 1158 fps | 94.9% |
| Alliant RED DOT² | <<locked>> | 60% | 25,991 psi | 60% | 1007 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 33,402 psi | 77% | 1237 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 23,917 psi | 55% | 1099 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 25,933 psi | 60% | 1027 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 17,492 psi | 40% | 909 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 28,500 psi | 66% | 1083 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 22,713 psi | 52% | 912 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 33,489 psi | 77% | 1276 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 10,022 psi | 23% | 686 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 28,094 psi | 65% | 1109 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 24,076 psi | 55% | 1194 fps | 87.5% |
| Lovex D037.2*² | <<locked>> | 76% | 32,097 psi | 74% | 1325 fps | 86.6% |
| Lovex S011² | <<locked>> | 60% | 32,953 psi | 76% | 1138 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 27,891 psi | 64% | 1129 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 22,626 psi | 52% | 1017 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 24,816 psi | 57% | 1047 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 25,034 psi | 58% | 1033 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 26,643 psi | 61% | 1037 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 29,370 psi | 68% | 1027 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 33,054 psi | 76% | 1237 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 32,343 psi | 74% | 1129 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 9,442 psi | 22% | 686 fps | 100% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 22,669 psi | 52% | 1083 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 20,798 psi | 48% | 1109 fps | 87.5% |
| Rottweil P 806² | <<locked>> | 60% | 18,594 psi | 43% | 1099 fps | 97.1% |
| Shooters World Heavy Pistol*² | <<locked>> | 76% | 32,097 psi | 74% | 1325 fps | 86.6% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 24,076 psi | 55% | 1194 fps | 87.5% |
| SNPE Vectan A0² | <<locked>> | 60% | 22,118 psi | 51% | 1037 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 27,079 psi | 62% | 1073 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 26,295 psi | 60% | 1079 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 30,356 psi | 70% | 1014 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 19,580 psi | 45% | 1030 fps | 97.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 26,440 psi | 61% | 1083 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 25,614 psi | 59% | 1214 fps | 97.7% |
| Somchem MP200² | <<locked>> | 60% | 27,572 psi | 63% | 1152 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 24,656 psi | 57% | 1086 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 30,647 psi | 70% | 1270 fps | 96.5% |
| Vihtavuori 3N37² | <<locked>> | 60% | 22,394 psi | 51% | 1106 fps | 99.4% |
| Vihtavuori 3N38*² | <<locked>> | 64% | 17,506 psi | 40% | 1030 fps | 85.3% |
| Vihtavuori N105*² | <<locked>> | 64% | 14,692 psi | 34% | 1004 fps | 86.2% |
| Vihtavuori N320² | <<locked>> | 60% | 28,572 psi | 66% | 1066 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 15,476 psi | 36% | 804 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 27,804 psi | 64% | 1109 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 24,265 psi | 56% | 1086 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 19,493 psi | 45% | 1047 fps | 98.7% |
| Winchester AutoComp ² | <<locked>> | 60% | 23,525 psi | 54% | 1050 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 13 powders for .357 Mag. loaded with the .357 | 158gr | X-TREME RNFP. Vihtavuori N105 delivers the highest muzzle velocity at 1,424 fps; across all powders the maximum-charge window runs from 899 fps to 1,424 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 13 of the 13 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (300 MPa), the top charges use 43–90 %, leaving at least 10 % headroom. Hodgdon TrailBoss, ReloadSwiss RS 14, Vihtavuori N32C Tin Star 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, Alliant BLUE DOT burn incompletely and react more sensitively to barrel length and temperature. Baschieri & Pellagri 102 Pistol, Hodgdon Clays, Hodgdon TrailBoss 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.