Load Specifications
Load data in caliber .357 Mag. with .357 | 158gr | Geco FMJ FLAT NOSE 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 3N38, Vihtavuori N105 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.
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Max Load - Barrel Length: 6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2² | <<locked>> | 72% | 36,071 psi | 83% | 1240 fps | 100% |
| Accurate No. 7*² | <<locked>> | 76% | 38,189 psi | 88% | 1424 fps | 94.7% |
| Accurate No. 9* | <<locked>> | 84% | 37,768 psi | 87% | 1407 fps | 89.1% |
| Accurate Solo 1000² | <<locked>> | 76% | 37,449 psi | 86% | 1161 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 80% | 37,753 psi | 87% | 1220 fps | 100% |
| Accurate TCM* | <<locked>> | 84% | 37,565 psi | 86% | 1401 fps | 90.4% |
| ADI AP 100 | <<locked>> | 96% | 37,260 psi | 86% | 1352 fps | 99.7% |
| ADI AP 70N² | <<locked>> | 64% | 34,621 psi | 80% | 1201 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 39,218 psi | 90% | 1079 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 38,101 psi | 88% | 1102 fps | 100% |
| ADI AS 30² | <<locked>> | 76% | 36,927 psi | 85% | 1125 fps | 100% |
| ADI AS 50N² | <<locked>> | 72% | 36,767 psi | 85% | 1168 fps | 100% |
| Alliant BE-86 | <<locked>> | 80% | 39,262 psi | 90% | 1224 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 96% | 36,477 psi | 84% | 1391 fps | 93.1% |
| Alliant BULLSEYE² | <<locked>> | 68% | 35,433 psi | 81% | 1263 fps | 100% |
| Alliant Green Dot² | <<locked>> | 76% | 37,275 psi | 86% | 1178 fps | 100% |
| Alliant Herco | <<locked>> | 96% | 38,522 psi | 89% | 1299 fps | 100% |
| Alliant POWER PISTOL | <<locked>> | 80% | 38,261 psi | 88% | 1407 fps | 99.6% |
| Alliant RED DOT | <<locked>> | 80% | 38,754 psi | 89% | 1165 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 64% | 35,752 psi | 82% | 1270 fps | 100% |
| Alliant UNIQUE | <<locked>> | 80% | 37,275 psi | 86% | 1289 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 76% | 37,101 psi | 85% | 1161 fps | 100% |
| Baschieri & Pellagri 102 Pistol | <<locked>> | 96% | 37,985 psi | 87% | 1184 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 72% | 38,087 psi | 88% | 1194 fps | 100% |
| Hodgdon Clays | <<locked>> | 84% | 36,492 psi | 84% | 1083 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 64% | 35,998 psi | 83% | 1312 fps | 100% |
| Hodgdon Longshot² | <<locked>> | 64% | 39,305 psi | 90% | 1342 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,695 psi | 41% | 883 fps | 100% |
| Hodgdon Universal² | <<locked>> | 72% | 35,563 psi | 82% | 1211 fps | 100% |
| Lovex D037.1*² | <<locked>> | 76% | 38,189 psi | 88% | 1424 fps | 94.7% |
| Lovex D037.2* | <<locked>> | 84% | 38,682 psi | 89% | 1421 fps | 89.5% |
| Lovex S011² | <<locked>> | 64% | 35,665 psi | 82% | 1171 fps | 100% |
| Lovex S020² | <<locked>> | 72% | 37,028 psi | 85% | 1243 fps | 100% |
| Maxam CSB 1 | <<locked>> | 84% | 38,406 psi | 88% | 1220 fps | 100% |
| Maxam CSB 2 | <<locked>> | 80% | 38,261 psi | 88% | 1220 fps | 100% |
| Maxam CSB 3 | <<locked>> | 80% | 38,667 psi | 89% | 1201 fps | 100% |
| Maxam CSB 4² | <<locked>> | 76% | 38,232 psi | 88% | 1178 fps | 100% |
| Maxam CSB 5² | <<locked>> | 72% | 37,913 psi | 87% | 1125 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 64% | 34,911 psi | 80% | 1263 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 68% | 36,535 psi | 84% | 1184 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,317 psi | 38% | 889 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 80% | 36,085 psi | 83% | 1266 fps | 100% |
| ReloadSwiss RS 24 | <<locked>> | 80% | 35,462 psi | 82% | 1371 fps | 95.7% |
| Rottweil P 801² | <<locked>> | 64% | 36,506 psi | 84% | 1158 fps | 100% |
| Rottweil P 806 | <<locked>> | 84% | 34,867 psi | 80% | 1381 fps | 100% |
| Shooters World Heavy Pistol* | <<locked>> | 84% | 38,682 psi | 89% | 1421 fps | 89.5% |
| Shooters World Major Pistol*² | <<locked>> | 76% | 38,189 psi | 88% | 1424 fps | 94.7% |
| SNPE Vectan A0 | <<locked>> | 84% | 38,740 psi | 89% | 1263 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 76% | 39,117 psi | 90% | 1217 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 76% | 38,159 psi | 88% | 1227 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 39,117 psi | 90% | 1112 fps | 100% |
| SNPE Vectan BA7 1/2 | <<locked>> | 88% | 37,260 psi | 86% | 1309 fps | 100% |
| SNPE Vectan BA9 1/2² | <<locked>> | 76% | 37,623 psi | 86% | 1227 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 76% | 38,754 psi | 89% | 1414 fps | 100% |
| Somchem MP200² | <<locked>> | 72% | 35,462 psi | 82% | 1260 fps | 100% |
| Somchem MS200 | <<locked>> | 80% | 38,798 psi | 89% | 1273 fps | 100% |
| Somchem S221² | <<locked>> | 68% | 36,608 psi | 84% | 1362 fps | 98.2% |
| Vihtavuori 3N37 | <<locked>> | 80% | 37,492 psi | 86% | 1329 fps | 100% |
| Vihtavuori 3N38 | <<locked>> | 96% | 38,682 psi | 89% | 1401 fps | 97.3% |
| Vihtavuori N105ᴾ | <<locked>> | 100% | 37,710 psi | 87% | 1437 fps | 99.5% |
| Vihtavuori N320² | <<locked>> | 72% | 37,579 psi | 86% | 1175 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 32,677 psi | 75% | 1056 fps | 100% |
| Vihtavuori N330² | <<locked>> | 72% | 36,941 psi | 85% | 1224 fps | 100% |
| Vihtavuori N340² | <<locked>> | 76% | 35,708 psi | 82% | 1243 fps | 100% |
| Vihtavuori N350 | <<locked>> | 88% | 39,291 psi | 90% | 1342 fps | 100% |
| Winchester 231² | <<locked>> | 64% | 38,305 psi | 88% | 1217 fps | 100% |
| Winchester AutoComp | <<locked>> | 80% | 36,405 psi | 84% | 1224 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% | 24,555 psi | 56% | 1096 fps | 100% |
| Accurate No. 7*² | <<locked>> | 60% | 21,480 psi | 49% | 1152 fps | 85.2% |
| Accurate No. 9* | <<locked>> | 80% | 33,199 psi | 76% | 1345 fps | 87% |
| Accurate Solo 1000² | <<locked>> | 60% | 25,237 psi | 58% | 1017 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 21,828 psi | 50% | 1020 fps | 100% |
| Accurate TCM*² | <<locked>> | 76% | 28,834 psi | 66% | 1273 fps | 85.9% |
| ADI AP 100*² | 6.1 gr | 60% | 14,301 psi | 33% | 935 fps | 87.8% |
| ADI AP 70N² | <<locked>> | 60% | 30,995 psi | 71% | 1158 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 26,847 psi | 62% | 945 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 25,788 psi | 59% | 961 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 25,396 psi | 58% | 991 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 27,354 psi | 63% | 1056 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 22,292 psi | 51% | 1020 fps | 100% |
| Alliant BLUE DOT* | <<locked>> | 80% | 23,467 psi | 54% | 1178 fps | 85.6% |
| Alliant BULLSEYE² | <<locked>> | 60% | 28,123 psi | 65% | 1168 fps | 100% |
| Alliant Green Dot² | <<locked>> | 60% | 24,497 psi | 56% | 1020 fps | 100% |
| Alliant Herco² | <<locked>> | 60% | 16,244 psi | 37% | 961 fps | 99.8% |
| Alliant POWER PISTOL*² | <<locked>> | 60% | 20,842 psi | 48% | 1119 fps | 93.2% |
| Alliant RED DOT² | <<locked>> | 60% | 24,178 psi | 56% | 991 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 32,010 psi | 74% | 1224 fps | 100% |
| Alliant UNIQUE² | <<locked>> | 60% | 21,901 psi | 50% | 1076 fps | 100% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 24,221 psi | 56% | 1010 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 15,606 psi | 36% | 889 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 26,237 psi | 60% | 1063 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 21,480 psi | 49% | 899 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 60% | 31,227 psi | 72% | 1253 fps | 99.9% |
| Hodgdon Longshot² | <<locked>> | 60% | 34,127 psi | 78% | 1283 fps | 100% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 8,151 psi | 19% | 659 fps | 100% |
| Hodgdon Universal² | <<locked>> | 60% | 26,005 psi | 60% | 1089 fps | 100% |
| Lovex D037.1*² | <<locked>> | 60% | 21,480 psi | 49% | 1152 fps | 85.2% |
| Lovex D037.2* | <<locked>> | 80% | 33,939 psi | 78% | 1355 fps | 87.3% |
| Lovex S011² | <<locked>> | 60% | 31,691 psi | 73% | 1129 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 25,933 psi | 60% | 1109 fps | 100% |
| Maxam CSB 1² | <<locked>> | 60% | 20,900 psi | 48% | 1001 fps | 100% |
| Maxam CSB 2² | <<locked>> | 60% | 22,394 psi | 51% | 1027 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 23,380 psi | 54% | 1017 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 25,077 psi | 58% | 1024 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 27,818 psi | 64% | 1014 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 30,748 psi | 71% | 1214 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 28,993 psi | 67% | 1102 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,484 psi | 17% | 653 fps | 99.9% |
| ReloadSwiss RS 20² | <<locked>> | 60% | 20,784 psi | 48% | 1063 fps | 100% |
| ReloadSwiss RS 24*² | <<locked>> | 60% | 18,971 psi | 44% | 1079 fps | 85.5% |
| Rottweil P 801² | <<locked>> | 60% | 32,721 psi | 75% | 1115 fps | 100% |
| Rottweil P 806*² | <<locked>> | 60% | 15,418 psi | 35% | 1040 fps | 94.5% |
| Shooters World Heavy Pistol* | <<locked>> | 80% | 33,939 psi | 78% | 1355 fps | 87.3% |
| Shooters World Major Pistol*² | <<locked>> | 60% | 21,480 psi | 49% | 1152 fps | 85.2% |
| SNPE Vectan A0² | <<locked>> | 60% | 20,624 psi | 47% | 1020 fps | 100% |
| SNPE Vectan A1² | <<locked>> | 60% | 25,744 psi | 59% | 1063 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 24,918 psi | 57% | 1070 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 60% | 29,312 psi | 67% | 1007 fps | 100% |
| SNPE Vectan BA7 1/2² | <<locked>> | 60% | 17,463 psi | 40% | 997 fps | 96.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 23,975 psi | 55% | 1056 fps | 100% |
| SNPE Vectan SP 2² | <<locked>> | 60% | 23,293 psi | 54% | 1184 fps | 96.7% |
| Somchem MP200² | <<locked>> | 60% | 25,034 psi | 58% | 1122 fps | 100% |
| Somchem MS200² | <<locked>> | 60% | 22,974 psi | 53% | 1070 fps | 100% |
| Somchem S221² | <<locked>> | 60% | 28,036 psi | 64% | 1237 fps | 95.3% |
| Vihtavuori 3N37² | <<locked>> | 60% | 19,943 psi | 46% | 1070 fps | 98.5% |
| Vihtavuori 3N38*² | 8.4 gr | 72% | 19,189 psi | 44% | 1083 fps | 86.9% |
| Vihtavuori N105*² | 8.3 gr | 72% | 15,751 psi | 36% | 1050 fps | 87.5% |
| Vihtavuori N320² | <<locked>> | 60% | 26,658 psi | 61% | 1050 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 13,924 psi | 32% | 794 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 25,788 psi | 59% | 1093 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 22,452 psi | 52% | 1066 fps | 100% |
| Vihtavuori N350² | <<locked>> | 60% | 17,709 psi | 41% | 1020 fps | 97.7% |
| Winchester 231² | <<locked>> | 60% | 33,518 psi | 77% | 1165 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 21,712 psi | 50% | 1033 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 .357 | 158gr | Geco FMJ FLAT NOSE. Vihtavuori N105 delivers the highest muzzle velocity at 1,437 fps; across all powders the maximum-charge window runs from 883 fps to 1,437 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 31 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 38–90 %, 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 3N38, Vihtavuori N105, ADI AP 100 rank at the top here: for .357 Mag. with the .357 | 158gr | Geco FMJ FLAT NOSE 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 No. 2, Accurate Solo 1000, Accurate Solo 1250 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.