Load Specifications
Load data in caliber 9 x 21 with .357 | 125gr | Speer JHP bullet and 59 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 Somchem MS200.
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% | 30,037 psi | 88% | 1148 fps | 98.1% |
| Accurate No. 5*² | <<locked>> | 68% | 30,356 psi | 89% | 1217 fps | 91% |
| Accurate Solo 1000 | <<locked>> | 80% | 29,515 psi | 87% | 1083 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 88% | 29,602 psi | 87% | 1138 fps | 100% |
| ADI AP 70N² | <<locked>> | 72% | 28,848 psi | 85% | 1145 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 30,168 psi | 89% | 988 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 29,617 psi | 87% | 1014 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 28,834 psi | 85% | 1050 fps | 100% |
| ADI AS 50N | <<locked>> | 80% | 30,618 psi | 90% | 1115 fps | 100% |
| Alliant BE-86 | <<locked>> | 84% | 27,557 psi | 81% | 1109 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 76% | 28,993 psi | 85% | 1178 fps | 99.7% |
| Alliant Green Dot | <<locked>> | 80% | 27,731 psi | 81% | 1079 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 26,571 psi | 78% | 1148 fps | 99% |
| Alliant RED DOT | <<locked>> | 84% | 30,356 psi | 89% | 1089 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 72% | 30,095 psi | 88% | 1194 fps | 99.6% |
| Alliant UNIQUE | <<locked>> | 88% | 28,703 psi | 84% | 1188 fps | 99.4% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 27,325 psi | 80% | 1063 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 26,745 psi | 78% | 1079 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 27,137 psi | 80% | 1093 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 29,167 psi | 86% | 1152 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 30,632 psi | 90% | 1024 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 72% | 28,485 psi | 84% | 1178 fps | 92.3% |
| Hodgdon Longshot*² | <<locked>> | 68% | 27,456 psi | 81% | 1165 fps | 93.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,458 psi | 34% | 774 fps | 100% |
| Hodgdon Universal | <<locked>> | 80% | 28,848 psi | 85% | 1145 fps | 100% |
| Lovex D036*² | <<locked>> | 68% | 30,414 psi | 89% | 1217 fps | 91% |
| Lovex S011² | <<locked>> | 72% | 30,560 psi | 90% | 1119 fps | 100% |
| Lovex S020 | <<locked>> | 80% | 28,935 psi | 85% | 1155 fps | 100% |
| Maxam CSB 1 | <<locked>> | 92% | 30,052 psi | 88% | 1142 fps | 100% |
| Maxam CSB 2 | <<locked>> | 92% | 30,792 psi | 90% | 1171 fps | 100% |
| Maxam CSB 3 | <<locked>> | 84% | 28,863 psi | 85% | 1109 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 28,718 psi | 84% | 1086 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 29,457 psi | 86% | 1053 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 72% | 28,674 psi | 84% | 1175 fps | 98.2% |
| Ramshot True Blue*² | <<locked>> | 68% | 29,080 psi | 85% | 1184 fps | 94.6% |
| ReloadSwiss RS 12² | <<locked>> | 76% | 27,978 psi | 82% | 1122 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 9,964 psi | 29% | 751 fps | 97.9% |
| ReloadSwiss RS 20 | <<locked>> | 92% | 29,530 psi | 87% | 1207 fps | 100% |
| Rottweil P 801² | <<locked>> | 72% | 30,124 psi | 88% | 1115 fps | 100% |
| Rottweil P 806*ᴾ | <<locked>> | 100% | 26,760 psi | 79% | 1260 fps | 92.5% |
| Shooters World Auto Pistol*² | <<locked>> | 68% | 30,414 psi | 89% | 1217 fps | 91% |
| SNPE Vectan A0 | <<locked>> | 92% | 30,197 psi | 89% | 1158 fps | 99.5% |
| SNPE Vectan A1 | <<locked>> | 80% | 29,747 psi | 87% | 1122 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 28,616 psi | 84% | 1119 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 29,602 psi | 87% | 1014 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 96% | 28,369 psi | 83% | 1161 fps | 93.5% |
| SNPE Vectan BA9 1/2 | <<locked>> | 84% | 30,327 psi | 89% | 1155 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 88% | 30,661 psi | 90% | 1283 fps | 90.7% |
| Somchem MP200 | <<locked>> | 80% | 28,224 psi | 83% | 1161 fps | 98.6% |
| Somchem MS200 | <<locked>> | 84% | 28,050 psi | 82% | 1142 fps | 99.6% |
| Vihtavuori 3N37 | <<locked>> | 92% | 30,676 psi | 90% | 1224 fps | 95.7% |
| Vihtavuori N310² | <<locked>> | 64% | 30,806 psi | 90% | 1037 fps | 100% |
| Vihtavuori N320 | <<locked>> | 80% | 29,443 psi | 86% | 1109 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 20,726 psi | 61% | 938 fps | 100% |
| Vihtavuori N330 | <<locked>> | 80% | 27,746 psi | 81% | 1142 fps | 100% |
| Vihtavuori N340 | <<locked>> | 84% | 27,760 psi | 81% | 1142 fps | 99.3% |
| Vihtavuori N350 | <<locked>> | 96% | 29,066 psi | 85% | 1198 fps | 95.3% |
| Winchester 231² | <<locked>> | 68% | 28,718 psi | 84% | 1119 fps | 100% |
| Winchester AutoComp | <<locked>> | 88% | 28,471 psi | 84% | 1142 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% | 16,201 psi | 48% | 912 fps | 90.1% |
| Accurate No. 5*² | <<locked>> | 60% | 22,974 psi | 67% | 1093 fps | 86.2% |
| Accurate Solo 1000² | <<locked>> | 60% | 17,579 psi | 52% | 902 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 14,112 psi | 41% | 873 fps | 97% |
| ADI AP 70N² | <<locked>> | 60% | 20,653 psi | 61% | 1017 fps | 99.9% |
| ADI APS 350² | <<locked>> | 60% | 21,074 psi | 62% | 873 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 19,145 psi | 56% | 873 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 17,709 psi | 52% | 889 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 18,608 psi | 55% | 938 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 14,083 psi | 41% | 876 fps | 98.8% |
| Alliant BULLSEYE² | <<locked>> | 60% | 18,797 psi | 55% | 997 fps | 96% |
| Alliant Green Dot² | <<locked>> | 60% | 17,477 psi | 51% | 919 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 10,443 psi | 31% | 784 fps | 85.4% |
| Alliant RED DOT² | <<locked>> | 60% | 16,810 psi | 49% | 886 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 20,842 psi | 61% | 1040 fps | 96.6% |
| Alliant UNIQUE*² | 3.8 gr | 60% | 14,141 psi | 41% | 899 fps | 91% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 16,259 psi | 48% | 889 fps | 100% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 9,573 psi | 28% | 751 fps | 98% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 16,868 psi | 49% | 932 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 26,107 psi | 77% | 1109 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 16,259 psi | 48% | 823 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 60% | 19,319 psi | 57% | 1017 fps | 85.7% |
| Hodgdon Longshot*² | <<locked>> | 60% | 21,379 psi | 63% | 1060 fps | 89.9% |
| Hodgdon TrailBoss*² | <<locked>> | 60% | 5,526 psi | 16% | 561 fps | 94% |
| Hodgdon Universal² | <<locked>> | 60% | 16,447 psi | 48% | 935 fps | 98.9% |
| Lovex D036*² | <<locked>> | 60% | 23,003 psi | 67% | 1093 fps | 86.2% |
| Lovex S011² | <<locked>> | 60% | 22,379 psi | 66% | 1007 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 16,143 psi | 47% | 935 fps | 95.6% |
| Maxam CSB 1² | <<locked>> | 60% | 13,634 psi | 40% | 853 fps | 96.6% |
| Maxam CSB 2² | <<locked>> | 60% | 12,763 psi | 37% | 873 fps | 99.5% |
| Maxam CSB 3² | <<locked>> | 60% | 15,911 psi | 47% | 899 fps | 99.9% |
| Maxam CSB 4² | <<locked>> | 60% | 17,071 psi | 50% | 909 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 19,812 psi | 58% | 925 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 19,711 psi | 58% | 1020 fps | 93.8% |
| Ramshot True Blue*² | <<locked>> | 60% | 21,886 psi | 64% | 1063 fps | 90.3% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 17,767 psi | 52% | 968 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 5,076 psi | 15% | 545 fps | 87.3% |
| ReloadSwiss RS 20*² | 3.9 gr | 60% | 12,096 psi | 35% | 860 fps | 90.6% |
| Rottweil P 801² | <<locked>> | 60% | 21,350 psi | 63% | 997 fps | 100% |
| Rottweil P 806* | <<locked>> | 92% | 20,334 psi | 60% | 1145 fps | 87.7% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 23,003 psi | 67% | 1093 fps | 86.2% |
| SNPE Vectan A0*² | <<locked>> | 60% | 13,300 psi | 39% | 840 fps | 89.6% |
| SNPE Vectan A1² | <<locked>> | 60% | 16,882 psi | 50% | 919 fps | 99.4% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 16,172 psi | 47% | 906 fps | 96.8% |
| SNPE Vectan BA10² | <<locked>> | 60% | 22,365 psi | 66% | 922 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 80% | 19,290 psi | 57% | 1001 fps | 87.1% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 16,128 psi | 47% | 919 fps | 98.1% |
| SNPE Vectan SP 2* | <<locked>> | 80% | 23,873 psi | 70% | 1171 fps | 86.2% |
| Somchem MP200*² | <<locked>> | 60% | 16,230 psi | 48% | 938 fps | 91.7% |
| Somchem MS200*² | 3.8 gr | 60% | 15,011 psi | 44% | 896 fps | 93.1% |
| Vihtavuori 3N37*² | <<locked>> | 72% | 17,535 psi | 51% | 994 fps | 86.9% |
| Vihtavuori N310² | <<locked>> | 60% | 26,513 psi | 78% | 988 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 17,158 psi | 50% | 928 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 8,702 psi | 26% | 696 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 15,069 psi | 44% | 925 fps | 98.9% |
| Vihtavuori N340*² | <<locked>> | 60% | 13,793 psi | 40% | 873 fps | 91% |
| Vihtavuori N350*² | <<locked>> | 76% | 16,795 psi | 49% | 974 fps | 86.5% |
| Winchester 231² | <<locked>> | 60% | 22,379 psi | 66% | 1027 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 13,576 psi | 40% | 866 fps | 95.4% |
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 59 powders for 9 x 21 loaded with the .357 | 125gr | Speer JHP. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,283 fps; across all powders the maximum-charge window runs from 751 fps to 1,283 fps. Alliant Herco gives the best case fill at 100 %, and 38 of the 59 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (235 MPa), the top charges use 29–90 %, 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, Somchem MS200 rank at the top here: for 9 x 21 with the .357 | 125gr | Speer JHP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate No. 5, Hodgdon HS-6, Hodgdon Longshot 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.