Load Specifications
Load data in caliber 9 x 21 with .357 | 127gr | H&N KS HP HS bullet and 61 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant UNIQUE, ReloadSwiss RS 20 and Somchem MP200.
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% | 27,543 psi | 81% | 1066 fps | 96.2% |
| Accurate No. 5*² | <<locked>> | 72% | 29,965 psi | 88% | 1158 fps | 89.2% |
| Accurate Solo 1000 | <<locked>> | 84% | 28,369 psi | 83% | 1030 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 30,734 psi | 90% | 1112 fps | 100% |
| ADI AP 70N | <<locked>> | 80% | 28,572 psi | 84% | 1109 fps | 100% |
| ADI APS 350 | <<locked>> | 80% | 29,646 psi | 87% | 942 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 28,253 psi | 83% | 961 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 29,486 psi | 87% | 1027 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 28,834 psi | 85% | 1060 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 28,761 psi | 84% | 1089 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 29,878 psi | 88% | 1148 fps | 99.5% |
| Alliant Green Dot | <<locked>> | 88% | 30,240 psi | 89% | 1066 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 21,321 psi | 63% | 1030 fps | 96.2% |
| Alliant RED DOT | <<locked>> | 92% | 29,501 psi | 87% | 1047 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 28,732 psi | 84% | 1132 fps | 98.8% |
| Alliant UNIQUE | <<locked>> | 96% | 28,050 psi | 82% | 1138 fps | 98.8% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 28,993 psi | 85% | 1047 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 21,944 psi | 64% | 988 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 29,109 psi | 85% | 1079 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 29,486 psi | 87% | 1109 fps | 100% |
| Hodgdon Clays | <<locked>> | 92% | 29,544 psi | 87% | 974 fps | 100% |
| Hodgdon HP38² | <<locked>> | 68% | 30,792 psi | 90% | 1099 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 76% | 26,716 psi | 78% | 1106 fps | 89.8% |
| Hodgdon Longshot*² | <<locked>> | 76% | 29,820 psi | 87% | 1155 fps | 93.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 8,108 psi | 24% | 673 fps | 98.1% |
| Hodgdon Universal | <<locked>> | 88% | 28,572 psi | 84% | 1109 fps | 100% |
| Lovex D036*² | <<locked>> | 72% | 29,921 psi | 88% | 1158 fps | 89.1% |
| Lovex S011² | <<locked>> | 76% | 30,168 psi | 89% | 1073 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 30,182 psi | 89% | 1132 fps | 99.9% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 29,878 psi | 88% | 1099 fps | 100% |
| Maxam CSB 2 | <<locked>> | 96% | 28,108 psi | 82% | 1112 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 29,240 psi | 86% | 1076 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 30,240 psi | 89% | 1070 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 30,530 psi | 90% | 1030 fps | 100% |
| Ramshot Silhouette | <<locked>> | 80% | 30,792 psi | 90% | 1158 fps | 98% |
| Ramshot True Blue*² | <<locked>> | 72% | 28,239 psi | 83% | 1125 fps | 92.8% |
| Ramshot Zip² | <<locked>> | 64% | 26,774 psi | 79% | 1056 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 28,427 psi | 83% | 1102 fps | 100% |
| ReloadSwiss RS 14*ᴾ | <<locked>> | 100% | 7,063 psi | 21% | 656 fps | 92.5% |
| ReloadSwiss RS 20ᴾ | <<locked>> | 100% | 30,066 psi | 88% | 1175 fps | 100% |
| Rottweil P 801² | <<locked>> | 76% | 26,803 psi | 79% | 1050 fps | 100% |
| Shooters World Auto Pistol*² | <<locked>> | 72% | 29,921 psi | 88% | 1158 fps | 89.1% |
| SNPE Vectan A0 | <<locked>> | 96% | 28,326 psi | 83% | 1089 fps | 98.5% |
| SNPE Vectan A1 | <<locked>> | 84% | 28,819 psi | 85% | 1070 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 30,298 psi | 89% | 1096 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 76% | 29,791 psi | 87% | 978 fps | 100% |
| SNPE Vectan BA7 1/2*ᴾ | <<locked>> | 100% | 26,658 psi | 78% | 1089 fps | 91.1% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 27,427 psi | 80% | 1079 fps | 100% |
| Somchem MP200 | <<locked>> | 88% | 29,530 psi | 87% | 1138 fps | 98.3% |
| Somchem MS200 | <<locked>> | 92% | 28,892 psi | 85% | 1115 fps | 99.4% |
| Vihtavuori 3N37* | <<locked>> | 96% | 27,601 psi | 81% | 1135 fps | 93.1% |
| Vihtavuori N310² | <<locked>> | 68% | 29,834 psi | 88% | 994 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 27,891 psi | 82% | 1056 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 16,346 psi | 48% | 856 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 28,311 psi | 83% | 1112 fps | 100% |
| Vihtavuori N340 | <<locked>> | 92% | 29,051 psi | 85% | 1119 fps | 99% |
| Vihtavuori N350*ᴾ | <<locked>> | 100% | 26,890 psi | 79% | 1119 fps | 93% |
| Winchester 231² | <<locked>> | 72% | 26,774 psi | 79% | 1056 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 29,675 psi | 87% | 1083 fps | 100% |
| Winchester 572*² | <<locked>> | 68% | 29,994 psi | 88% | 1161 fps | 92.9% |
| Winchester AutoComp | <<locked>> | 96% | 28,877 psi | 85% | 1109 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>> | 64% | 15,389 psi | 45% | 860 fps | 87.6% |
| Accurate No. 5*² | <<locked>> | 68% | 25,367 psi | 74% | 1089 fps | 86.4% |
| Accurate Solo 1000² | <<locked>> | 60% | 14,953 psi | 44% | 827 fps | 100% |
| Accurate Solo 1250*² | <<locked>> | 60% | 10,936 psi | 32% | 768 fps | 92.5% |
| ADI AP 70N² | <<locked>> | 60% | 16,070 psi | 47% | 909 fps | 98.3% |
| ADI APS 350² | <<locked>> | 60% | 17,840 psi | 52% | 797 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 17,608 psi | 52% | 820 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 14,243 psi | 42% | 807 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 15,519 psi | 46% | 856 fps | 99.9% |
| Alliant BE-86² | <<locked>> | 60% | 11,197 psi | 33% | 787 fps | 95.8% |
| Alliant BULLSEYE*² | <<locked>> | 60% | 15,026 psi | 44% | 883 fps | 91.6% |
| Alliant Green Dot² | <<locked>> | 60% | 15,113 psi | 44% | 833 fps | 99.9% |
| Alliant Herco*² | <<locked>> | 76% | 11,995 psi | 35% | 823 fps | 87% |
| Alliant RED DOT² | <<locked>> | 60% | 13,155 psi | 39% | 797 fps | 100% |
| Alliant Sport Pistol*² | <<locked>> | 60% | 17,390 psi | 51% | 935 fps | 93% |
| Alliant UNIQUE*² | 3.2 gr | 60% | 10,965 psi | 32% | 791 fps | 85.1% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 12,821 psi | 38% | 794 fps | 98.3% |
| Baschieri & Pellagri 102 Pistol*² | <<locked>> | 60% | 7,252 psi | 21% | 669 fps | 93.5% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 13,402 psi | 39% | 843 fps | 99.4% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 22,582 psi | 66% | 1010 fps | 99.4% |
| Hodgdon Clays² | <<locked>> | 60% | 13,431 psi | 39% | 748 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 24,120 psi | 71% | 1014 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 68% | 20,711 psi | 61% | 1007 fps | 85.4% |
| Hodgdon Longshot*² | <<locked>> | 64% | 19,377 psi | 57% | 984 fps | 86.7% |
| Hodgdon TrailBoss*² | <<locked>> | 64% | 3,989 psi | 12% | 499 fps | 86.9% |
| Hodgdon Universal² | <<locked>> | 60% | 12,676 psi | 37% | 830 fps | 95.6% |
| Lovex D036*² | <<locked>> | 68% | 25,324 psi | 74% | 1089 fps | 86.3% |
| Lovex S011² | <<locked>> | 60% | 18,391 psi | 54% | 906 fps | 99.5% |
| Lovex S020*² | <<locked>> | 60% | 12,256 psi | 36% | 820 fps | 90.3% |
| Maxam CSB 1*² | <<locked>> | 60% | 10,501 psi | 31% | 751 fps | 91.9% |
| Maxam CSB 2² | <<locked>> | 60% | 9,602 psi | 28% | 778 fps | 96.5% |
| Maxam CSB 3² | <<locked>> | 60% | 12,386 psi | 36% | 797 fps | 98% |
| Maxam CSB 4² | <<locked>> | 60% | 14,257 psi | 42% | 833 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 16,650 psi | 49% | 850 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 16,201 psi | 48% | 915 fps | 89.4% |
| Ramshot True Blue*² | <<locked>> | 60% | 18,275 psi | 54% | 958 fps | 85.6% |
| Ramshot Zip² | <<locked>> | 60% | 23,090 psi | 68% | 1004 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 13,445 psi | 39% | 873 fps | 100% |
| ReloadSwiss RS 14* | <<locked>> | 84% | 5,352 psi | 16% | 581 fps | 87.3% |
| ReloadSwiss RS 20*² | 3.5 gr | 64% | 10,820 psi | 32% | 797 fps | 86.9% |
| Rottweil P 801² | <<locked>> | 60% | 16,230 psi | 48% | 899 fps | 100% |
| Shooters World Auto Pistol*² | <<locked>> | 68% | 25,324 psi | 74% | 1089 fps | 86.3% |
| SNPE Vectan A0*² | <<locked>> | 64% | 12,067 psi | 35% | 784 fps | 86.4% |
| SNPE Vectan A1² | <<locked>> | 60% | 14,344 psi | 42% | 837 fps | 97.6% |
| SNPE Vectan BA 9*² | <<locked>> | 60% | 13,706 psi | 40% | 820 fps | 93.5% |
| SNPE Vectan BA10² | <<locked>> | 60% | 18,782 psi | 55% | 840 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 88% | 19,783 psi | 58% | 974 fps | 86% |
| SNPE Vectan BA9 1/2*² | <<locked>> | 60% | 12,995 psi | 38% | 823 fps | 94.7% |
| Somchem MP200*² | 3.6 gr | 60% | 12,836 psi | 38% | 830 fps | 86.2% |
| Somchem MS200*² | <<locked>> | 60% | 12,082 psi | 35% | 797 fps | 88.2% |
| Vihtavuori 3N37* | <<locked>> | 80% | 17,448 psi | 51% | 961 fps | 85.4% |
| Vihtavuori N310² | <<locked>> | 60% | 23,250 psi | 68% | 922 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 13,198 psi | 39% | 830 fps | 99.9% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 5,656 psi | 17% | 594 fps | 98% |
| Vihtavuori N330² | <<locked>> | 60% | 11,850 psi | 35% | 827 fps | 95.6% |
| Vihtavuori N340*² | <<locked>> | 60% | 10,979 psi | 32% | 778 fps | 85.6% |
| Vihtavuori N350* | <<locked>> | 88% | 18,492 psi | 54% | 978 fps | 86.7% |
| Winchester 231² | <<locked>> | 60% | 18,666 psi | 55% | 935 fps | 99.5% |
| Winchester 244² | <<locked>> | 60% | 26,934 psi | 79% | 1050 fps | 100% |
| Winchester 572*² | <<locked>> | 60% | 21,915 psi | 64% | 1033 fps | 87.9% |
| Winchester AutoComp *² | <<locked>> | 60% | 10,240 psi | 30% | 758 fps | 89.9% |
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 61 powders for 9 x 21 loaded with the .357 | 127gr | H&N KS HP HS. ReloadSwiss RS 20 delivers the highest muzzle velocity at 1,175 fps; across all powders the maximum-charge window runs from 656 fps to 1,175 fps. Alliant Herco gives the best case fill at 100 %, and 44 of the 61 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (235 MPa), the top charges use 21–90 %, 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. Alliant UNIQUE, ReloadSwiss RS 20, Somchem MP200 rank at the top here: for 9 x 21 with the .357 | 127gr | H&N KS HP HS 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.