Load Specifications
Load data in caliber .357 SIG with .355 | 121gr | Frontier Bullets CMJ FP atch bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 20, Vihtavuori 3N37 and Alliant UNIQUE.
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: 4.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2 | <<locked>> | 84% | 38,522 psi | 87% | 1332 fps | 99.9% |
| Accurate No. 5*² | <<locked>> | 68% | 35,273 psi | 80% | 1368 fps | 94.4% |
| Accurate Solo 1000 | <<locked>> | 84% | 36,376 psi | 82% | 1227 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 92% | 38,101 psi | 86% | 1306 fps | 100% |
| ADI AP 100*ᴾ | <<locked>> | 100% | 29,617 psi | 67% | 1276 fps | 89.7% |
| ADI AP 70N² | <<locked>> | 76% | 37,797 psi | 85% | 1319 fps | 100% |
| ADI APS 350 | <<locked>> | 84% | 39,900 psi | 90% | 1152 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 37,956 psi | 86% | 1168 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 39,421 psi | 89% | 1230 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 39,247 psi | 89% | 1276 fps | 100% |
| Alliant BE-86 | <<locked>> | 88% | 36,724 psi | 83% | 1283 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 80% | 37,231 psi | 84% | 1362 fps | 100% |
| Alliant Green Dot | <<locked>> | 88% | 38,595 psi | 87% | 1273 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 31,952 psi | 72% | 1293 fps | 100% |
| Alliant POWER PISTOL* | <<locked>> | 92% | 37,681 psi | 85% | 1447 fps | 92.8% |
| Alliant RED DOT | <<locked>> | 92% | 39,972 psi | 90% | 1257 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 37,768 psi | 85% | 1371 fps | 100% |
| Alliant UNIQUE | <<locked>> | 92% | 37,623 psi | 85% | 1375 fps | 100% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 38,812 psi | 88% | 1260 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 31,763 psi | 72% | 1201 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 80% | 36,245 psi | 82% | 1260 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 39,726 psi | 90% | 1345 fps | 100% |
| Hodgdon Clays | <<locked>> | 96% | 38,682 psi | 87% | 1175 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 36,985 psi | 84% | 1276 fps | 100% |
| Hodgdon HS-6² | <<locked>> | 76% | 38,014 psi | 86% | 1391 fps | 97% |
| Hodgdon Longshot² | <<locked>> | 72% | 37,347 psi | 84% | 1385 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 14,504 psi | 33% | 866 fps | 100% |
| Hodgdon Universal | <<locked>> | 84% | 37,797 psi | 85% | 1319 fps | 100% |
| Lovex D036*² | <<locked>> | 68% | 35,201 psi | 80% | 1368 fps | 94.3% |
| Lovex S011² | <<locked>> | 76% | 39,450 psi | 89% | 1289 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 38,740 psi | 88% | 1345 fps | 100% |
| Maxam CSB 1 | <<locked>> | 96% | 37,884 psi | 86% | 1302 fps | 100% |
| Maxam CSB 2 | <<locked>> | 92% | 37,768 psi | 85% | 1309 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 38,899 psi | 88% | 1289 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 39,450 psi | 89% | 1273 fps | 100% |
| Maxam CSB 5 | <<locked>> | 80% | 36,332 psi | 82% | 1188 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 37,782 psi | 85% | 1371 fps | 100% |
| Ramshot True Blue² | <<locked>> | 72% | 39,059 psi | 88% | 1398 fps | 98.5% |
| Ramshot Zip² | <<locked>> | 64% | 36,738 psi | 83% | 1283 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 80% | 38,058 psi | 86% | 1296 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 13,619 psi | 31% | 869 fps | 100% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 39,088 psi | 88% | 1394 fps | 100% |
| Rottweil P 801² | <<locked>> | 72% | 36,535 psi | 83% | 1240 fps | 100% |
| Rottweil P 806ᴾ | <<locked>> | 100% | 35,563 psi | 80% | 1460 fps | 96.9% |
| Shooters World Auto Pistol*² | <<locked>> | 68% | 35,201 psi | 80% | 1368 fps | 94.3% |
| SNPE Vectan A0 | <<locked>> | 96% | 37,797 psi | 85% | 1329 fps | 100% |
| SNPE Vectan A1 | <<locked>> | 84% | 37,608 psi | 85% | 1283 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 39,726 psi | 90% | 1322 fps | 100% |
| SNPE Vectan BA10 | <<locked>> | 80% | 39,175 psi | 89% | 1181 fps | 100% |
| SNPE Vectan BA7 1/2ᴾ | <<locked>> | 100% | 36,825 psi | 83% | 1358 fps | 97.5% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 38,247 psi | 86% | 1316 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 88% | 37,217 psi | 84% | 1457 fps | 94.5% |
| Somchem MP200 | <<locked>> | 84% | 37,246 psi | 84% | 1355 fps | 100% |
| Somchem MS200 | <<locked>> | 92% | 39,900 psi | 90% | 1368 fps | 100% |
| Somchem S221* | <<locked>> | 80% | 38,609 psi | 87% | 1421 fps | 90.1% |
| Vihtavuori 3N37 | <<locked>> | 92% | 35,984 psi | 81% | 1375 fps | 98.2% |
| Vihtavuori N310² | <<locked>> | 68% | 38,740 psi | 88% | 1178 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 38,406 psi | 87% | 1270 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 25,701 psi | 58% | 1050 fps | 100% |
| Vihtavuori N330 | <<locked>> | 84% | 37,826 psi | 86% | 1325 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 39,929 psi | 90% | 1365 fps | 100% |
| Vihtavuori N350ᴾ | <<locked>> | 100% | 37,826 psi | 86% | 1394 fps | 98.7% |
| Winchester 231² | <<locked>> | 72% | 36,738 psi | 83% | 1283 fps | 100% |
| Winchester 572² | <<locked>> | 64% | 36,405 psi | 82% | 1378 fps | 97.5% |
| Winchester AutoComp | <<locked>> | 96% | 40,030 psi | 90% | 1345 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 4.5"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate No. 2*² | <<locked>> | 60% | 18,884 psi | 43% | 1024 fps | 93.8% |
| Accurate No. 5*² | <<locked>> | 60% | 27,528 psi | 62% | 1243 fps | 90.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 21,118 psi | 48% | 1014 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 17,477 psi | 40% | 988 fps | 99.4% |
| ADI AP 100* | <<locked>> | 92% | 25,034 psi | 57% | 1198 fps | 86.8% |
| ADI AP 70N² | <<locked>> | 60% | 24,990 psi | 56% | 1142 fps | 100% |
| ADI APS 350² | <<locked>> | 60% | 23,163 psi | 52% | 948 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 21,814 psi | 49% | 961 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 21,190 psi | 48% | 988 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 22,539 psi | 51% | 1050 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 17,695 psi | 40% | 994 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 60% | 21,683 psi | 49% | 1109 fps | 98.3% |
| Alliant Green Dot² | <<locked>> | 60% | 20,610 psi | 47% | 1017 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 13,402 psi | 30% | 906 fps | 91.3% |
| Alliant POWER PISTOL*² | <<locked>> | 76% | 24,874 psi | 56% | 1227 fps | 85.6% |
| Alliant RED DOT² | <<locked>> | 60% | 20,523 psi | 46% | 991 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 24,062 psi | 54% | 1158 fps | 98.7% |
| Alliant UNIQUE² | 4.5 gr | 60% | 17,506 psi | 40% | 1020 fps | 95.3% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 19,812 psi | 45% | 1001 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 12,763 psi | 29% | 866 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 20,131 psi | 46% | 1037 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 30,487 psi | 69% | 1234 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 18,362 psi | 42% | 899 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 32,605 psi | 74% | 1224 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 23,221 psi | 52% | 1155 fps | 90.2% |
| Hodgdon Longshot*² | <<locked>> | 60% | 25,411 psi | 57% | 1198 fps | 93.8% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,542 psi | 17% | 643 fps | 98.8% |
| Hodgdon Universal² | <<locked>> | 60% | 20,943 psi | 47% | 1066 fps | 100% |
| Lovex D036*² | <<locked>> | 60% | 27,470 psi | 62% | 1243 fps | 90.6% |
| Lovex S011² | <<locked>> | 60% | 25,092 psi | 57% | 1106 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 19,363 psi | 44% | 1050 fps | 98.3% |
| Maxam CSB 1² | <<locked>> | 60% | 16,244 psi | 37% | 955 fps | 99% |
| Maxam CSB 2² | <<locked>> | 60% | 16,984 psi | 38% | 994 fps | 100% |
| Maxam CSB 3² | <<locked>> | 60% | 18,724 psi | 42% | 997 fps | 100% |
| Maxam CSB 4² | <<locked>> | 60% | 20,015 psi | 45% | 1004 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 23,061 psi | 52% | 1017 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 60% | 23,018 psi | 52% | 1142 fps | 96.7% |
| Ramshot True Blue*² | <<locked>> | 60% | 26,600 psi | 60% | 1214 fps | 94.4% |
| Ramshot Zip² | <<locked>> | 60% | 32,547 psi | 74% | 1230 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 23,032 psi | 52% | 1096 fps | 100% |
| ReloadSwiss RS 14² | <<locked>> | 60% | 7,484 psi | 17% | 646 fps | 95.5% |
| ReloadSwiss RS 20² | 4.7 gr | 60% | 15,476 psi | 35% | 994 fps | 95.9% |
| Rottweil P 801² | <<locked>> | 60% | 26,368 psi | 60% | 1112 fps | 100% |
| Rottweil P 806*² | <<locked>> | 76% | 17,100 psi | 39% | 1119 fps | 85.2% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 27,470 psi | 62% | 1243 fps | 90.6% |
| SNPE Vectan A0*² | <<locked>> | 60% | 16,592 psi | 38% | 965 fps | 94.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 20,088 psi | 45% | 1030 fps | 100% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 19,290 psi | 44% | 1020 fps | 99.1% |
| SNPE Vectan BA10² | <<locked>> | 60% | 24,627 psi | 56% | 1004 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 68% | 17,231 psi | 39% | 1004 fps | 86.3% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 19,276 psi | 44% | 1027 fps | 99.7% |
| SNPE Vectan SP 2*² | <<locked>> | 72% | 23,656 psi | 53% | 1227 fps | 87.1% |
| Somchem MP200² | <<locked>> | 60% | 19,580 psi | 44% | 1060 fps | 95.5% |
| Somchem MS200² | <<locked>> | 60% | 17,912 psi | 40% | 1010 fps | 96.6% |
| Somchem S221*² | <<locked>> | 72% | 30,052 psi | 68% | 1293 fps | 85.9% |
| Vihtavuori 3N37*² | 5.4 gr | 60% | 15,098 psi | 34% | 974 fps | 85.3% |
| Vihtavuori N310² | <<locked>> | 60% | 30,893 psi | 70% | 1093 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 21,190 psi | 48% | 1040 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 11,705 psi | 26% | 787 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 19,319 psi | 44% | 1053 fps | 100% |
| Vihtavuori N340² | <<locked>> | 60% | 17,405 psi | 39% | 1007 fps | 95.6% |
| Vihtavuori N350*² | <<locked>> | 64% | 14,808 psi | 33% | 968 fps | 85.3% |
| Winchester 231² | <<locked>> | 60% | 26,687 psi | 60% | 1148 fps | 100% |
| Winchester 572² | <<locked>> | 60% | 32,518 psi | 74% | 1322 fps | 96.3% |
| Winchester AutoComp ² | <<locked>> | 60% | 17,027 psi | 38% | 988 fps | 98.6% |
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 65 powders for .357 SIG loaded with the .355 | 121gr | Frontier Bullets CMJ FP atch. Rottweil P 806 delivers the highest muzzle velocity at 1,460 fps; across all powders the maximum-charge window runs from 866 fps to 1,460 fps. ADI AP 100 gives the best case fill at 100 %, and 48 of the 65 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 31–90 %, leaving at least 10 % headroom. ADI AP 100, Alliant Herco, Baschieri & Pellagri 102 Pistol 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. ReloadSwiss RS 20, Vihtavuori 3N37, Alliant UNIQUE rank at the top here: for .357 SIG with the .355 | 121gr | Frontier Bullets CMJ FP atch they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 5, ADI AP 100, Alliant POWER PISTOL 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.