Load Specifications
Load data in caliber 9 x 21 with .357 | 125gr | Speer TMJ bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 20, Alliant UNIQUE and SNPE Vectan A0.
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>> | 80% | 29,443 psi | 86% | 1145 fps | 98% |
| Accurate No. 5*² | <<locked>> | 64% | 26,977 psi | 79% | 1165 fps | 89.2% |
| Accurate Solo 1000 | <<locked>> | 80% | 30,342 psi | 89% | 1096 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 88% | 30,313 psi | 89% | 1152 fps | 100% |
| ADI AP 70N² | <<locked>> | 72% | 28,384 psi | 83% | 1142 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 28,384 psi | 83% | 968 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 29,153 psi | 86% | 1010 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 29,747 psi | 87% | 1063 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 28,935 psi | 85% | 1096 fps | 100% |
| Alliant BE-86 | <<locked>> | 84% | 28,166 psi | 83% | 1119 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 76% | 29,689 psi | 87% | 1191 fps | 99.8% |
| Alliant Green Dot | <<locked>> | 80% | 28,500 psi | 84% | 1093 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 27,064 psi | 79% | 1158 fps | 99.1% |
| Alliant POWER PISTOL* | <<locked>> | 88% | 29,124 psi | 85% | 1237 fps | 87.4% |
| Alliant RED DOT | <<locked>> | 84% | 29,921 psi | 88% | 1086 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 72% | 29,646 psi | 87% | 1191 fps | 99.6% |
| Alliant UNIQUE | <<locked>> | 88% | 29,327 psi | 86% | 1198 fps | 99.6% |
| Baschieri & Pellagri 100 | <<locked>> | 84% | 30,560 psi | 90% | 1106 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 27,354 psi | 80% | 1089 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 80% | 30,530 psi | 90% | 1135 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 29,834 psi | 88% | 1161 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 30,168 psi | 89% | 1020 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 72% | 28,892 psi | 85% | 1188 fps | 92.6% |
| Hodgdon Longshot*² | <<locked>> | 68% | 27,891 psi | 82% | 1175 fps | 94.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,313 psi | 33% | 771 fps | 100% |
| Hodgdon Universal | <<locked>> | 80% | 29,515 psi | 87% | 1158 fps | 100% |
| Lovex D036*² | <<locked>> | 64% | 26,934 psi | 79% | 1165 fps | 89.1% |
| Lovex S011² | <<locked>> | 68% | 27,586 psi | 81% | 1086 fps | 100% |
| Lovex S020 | <<locked>> | 80% | 29,689 psi | 87% | 1168 fps | 100% |
| Maxam CSB 1 | <<locked>> | 92% | 30,748 psi | 90% | 1152 fps | 100% |
| Maxam CSB 2 | <<locked>> | 88% | 29,109 psi | 85% | 1155 fps | 100% |
| Maxam CSB 3 | <<locked>> | 84% | 29,631 psi | 87% | 1119 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 28,326 psi | 83% | 1086 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 30,342 psi | 89% | 1063 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 72% | 29,269 psi | 86% | 1184 fps | 98.4% |
| Ramshot True Blue*² | <<locked>> | 68% | 29,515 psi | 87% | 1191 fps | 94.9% |
| ReloadSwiss RS 12² | <<locked>> | 76% | 28,761 psi | 84% | 1135 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 10,341 psi | 30% | 764 fps | 98.3% |
| ReloadSwiss RS 20 | <<locked>> | 92% | 30,182 psi | 89% | 1217 fps | 100% |
| Rottweil P 801² | <<locked>> | 68% | 27,369 psi | 80% | 1083 fps | 100% |
| Rottweil P 806*ᴾ | <<locked>> | 100% | 27,108 psi | 80% | 1266 fps | 92.7% |
| Shooters World Auto Pistol*² | <<locked>> | 64% | 26,934 psi | 79% | 1165 fps | 89.1% |
| SNPE Vectan A0 | <<locked>> | 92% | 30,763 psi | 90% | 1168 fps | 99.6% |
| SNPE Vectan A1 | <<locked>> | 80% | 30,371 psi | 89% | 1132 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 29,225 psi | 86% | 1129 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 30,472 psi | 89% | 1027 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 96% | 28,776 psi | 84% | 1171 fps | 93.7% |
| SNPE Vectan BA9 1/2 | <<locked>> | 84% | 29,863 psi | 88% | 1152 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 84% | 27,064 psi | 79% | 1227 fps | 88.6% |
| Somchem MP200 | <<locked>> | 80% | 28,805 psi | 85% | 1175 fps | 98.8% |
| Somchem MS200 | <<locked>> | 84% | 28,660 psi | 84% | 1155 fps | 99.7% |
| Vihtavuori 3N37* | <<locked>> | 88% | 28,021 psi | 82% | 1188 fps | 94.7% |
| Vihtavuori N310² | <<locked>> | 64% | 30,342 psi | 89% | 1033 fps | 100% |
| Vihtavuori N320 | <<locked>> | 80% | 30,298 psi | 89% | 1119 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 21,335 psi | 63% | 948 fps | 100% |
| Vihtavuori N330 | <<locked>> | 80% | 28,413 psi | 83% | 1152 fps | 100% |
| Vihtavuori N340 | <<locked>> | 88% | 30,748 psi | 90% | 1188 fps | 99.8% |
| Vihtavuori N350 | <<locked>> | 96% | 29,573 psi | 87% | 1207 fps | 95.7% |
| Winchester 231² | <<locked>> | 68% | 29,399 psi | 86% | 1129 fps | 100% |
| Winchester AutoComp | <<locked>> | 88% | 29,167 psi | 86% | 1152 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% | 15,969 psi | 47% | 909 fps | 90% |
| Accurate No. 5*² | <<locked>> | 60% | 23,467 psi | 69% | 1102 fps | 86.7% |
| Accurate Solo 1000² | <<locked>> | 60% | 18,289 psi | 54% | 919 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 13,967 psi | 41% | 869 fps | 96.9% |
| ADI AP 70N² | <<locked>> | 60% | 20,378 psi | 60% | 1017 fps | 99.9% |
| ADI APS 350² | <<locked>> | 60% | 20,769 psi | 61% | 869 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 19,928 psi | 58% | 886 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 17,506 psi | 51% | 886 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 18,376 psi | 54% | 935 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 14,504 psi | 43% | 889 fps | 99.1% |
| Alliant BULLSEYE² | <<locked>> | 60% | 18,579 psi | 55% | 994 fps | 95.9% |
| Alliant Green Dot² | <<locked>> | 60% | 17,260 psi | 51% | 915 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,327 psi | 30% | 781 fps | 85.3% |
| Alliant POWER PISTOL* | <<locked>> | 84% | 26,339 psi | 77% | 1191 fps | 85.6% |
| Alliant RED DOT² | <<locked>> | 60% | 16,607 psi | 49% | 886 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 21,437 psi | 63% | 1053 fps | 97% |
| Alliant UNIQUE*² | 3.8 gr | 60% | 13,982 psi | 41% | 896 fps | 90.9% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 16,056 psi | 47% | 886 fps | 99.9% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 9,950 psi | 29% | 768 fps | 98.4% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 16,650 psi | 49% | 932 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 26,629 psi | 78% | 1119 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 16,099 psi | 47% | 820 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 19,043 psi | 56% | 1010 fps | 85.5% |
| Hodgdon Longshot*² | <<locked>> | 60% | 21,045 psi | 62% | 1053 fps | 89.7% |
| Hodgdon TrailBoss*² | <<locked>> | 60% | 5,482 psi | 16% | 561 fps | 94% |
| Hodgdon Universal² | <<locked>> | 60% | 17,013 psi | 50% | 948 fps | 99.2% |
| Lovex D036*² | <<locked>> | 60% | 23,424 psi | 69% | 1106 fps | 86.7% |
| Lovex S011² | <<locked>> | 60% | 22,002 psi | 65% | 1004 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 15,896 psi | 47% | 932 fps | 95.5% |
| Maxam CSB 1² | <<locked>> | 60% | 13,431 psi | 39% | 850 fps | 96.5% |
| Maxam CSB 2² | <<locked>> | 60% | 13,343 psi | 39% | 886 fps | 99.7% |
| Maxam CSB 3² | <<locked>> | 60% | 15,693 psi | 46% | 896 fps | 99.9% |
| Maxam CSB 4² | <<locked>> | 60% | 16,824 psi | 49% | 909 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 19,551 psi | 57% | 922 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 19,421 psi | 57% | 1017 fps | 93.7% |
| Ramshot True Blue*² | <<locked>> | 60% | 22,321 psi | 65% | 1073 fps | 90.7% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 17,535 psi | 51% | 965 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,062 psi | 15% | 541 fps | 87.4% |
| ReloadSwiss RS 20*² | 4 gr | 60% | 12,531 psi | 37% | 873 fps | 91.5% |
| Rottweil P 801² | <<locked>> | 60% | 21,089 psi | 62% | 994 fps | 100% |
| Rottweil P 806* | <<locked>> | 88% | 18,652 psi | 55% | 1112 fps | 86.2% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 23,424 psi | 69% | 1106 fps | 86.7% |
| SNPE Vectan A0*² | 3.8 gr | 60% | 13,764 psi | 40% | 853 fps | 90.3% |
| SNPE Vectan A1² | <<locked>> | 60% | 17,405 psi | 51% | 928 fps | 99.6% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 16,665 psi | 49% | 919 fps | 97.2% |
| SNPE Vectan BA10² | <<locked>> | 60% | 22,031 psi | 65% | 919 fps | 100% |
| SNPE Vectan BA7 1/2*² | <<locked>> | 76% | 17,666 psi | 52% | 968 fps | 85.6% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 15,896 psi | 47% | 915 fps | 98% |
| SNPE Vectan SP 2* | <<locked>> | 80% | 24,265 psi | 71% | 1181 fps | 86.6% |
| Somchem MP200*² | <<locked>> | 60% | 16,027 psi | 47% | 935 fps | 91.6% |
| Somchem MS200*² | <<locked>> | 60% | 15,490 psi | 45% | 909 fps | 93.7% |
| Vihtavuori 3N37*² | <<locked>> | 72% | 17,231 psi | 51% | 988 fps | 86.7% |
| Vihtavuori N310² | <<locked>> | 60% | 27,470 psi | 81% | 1004 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 16,969 psi | 50% | 925 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 8,615 psi | 25% | 692 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 15,650 psi | 46% | 942 fps | 99.2% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,272 psi | 42% | 889 fps | 91.7% |
| Vihtavuori N350*² | <<locked>> | 76% | 17,231 psi | 51% | 988 fps | 87.1% |
| Winchester 231² | <<locked>> | 60% | 23,047 psi | 68% | 1040 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 13,982 psi | 41% | 879 fps | 95.9% |
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 60 powders for 9 x 21 loaded with the .357 | 125gr | Speer TMJ. Rottweil P 806 delivers the highest muzzle velocity at 1,266 fps; across all powders the maximum-charge window runs from 764 fps to 1,266 fps. Alliant Herco gives the best case fill at 100 %, and 39 of the 60 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (235 MPa), the top charges use 30–90 %, leaving at least 10 % headroom. Alliant Herco, Baschieri & Pellagri 102 Pistol, Hodgdon TrailBoss 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, Alliant UNIQUE, SNPE Vectan A0 rank at the top here: for 9 x 21 with the .357 | 125gr | Speer TMJ they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 5, Alliant POWER PISTOL, Hodgdon HS-6 burn incompletely and react more sensitively to barrel length and temperature. Accurate No. 2, Accurate No. 5, Accurate Solo 1000 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.