Load Specifications
Load data in caliber 9 x 21 with .355 | 124gr | Geco HEXAGON bullet and 58 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant UNIQUE, Vihtavuori N340 and Lovex S020.
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>> | 88% | 30,226 psi | 89% | 1086 fps | 96.2% |
| Accurate Solo 1000 | <<locked>> | 88% | 30,327 psi | 89% | 1043 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 30,298 psi | 89% | 1099 fps | 100% |
| ADI AP 70N | <<locked>> | 80% | 28,747 psi | 84% | 1099 fps | 100% |
| ADI APS 350 | <<locked>> | 80% | 29,472 psi | 86% | 935 fps | 100% |
| ADI APS 450 | <<locked>> | 84% | 29,907 psi | 88% | 971 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 30,240 psi | 89% | 1024 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 28,456 psi | 83% | 1043 fps | 100% |
| Alliant BE-86 | <<locked>> | 96% | 30,371 psi | 89% | 1096 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 29,225 psi | 86% | 1125 fps | 98.8% |
| Alliant Green Dot | <<locked>> | 88% | 28,050 psi | 82% | 1043 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 21,944 psi | 64% | 1024 fps | 95.5% |
| Alliant RED DOT | <<locked>> | 92% | 30,298 psi | 89% | 1047 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 76% | 28,239 psi | 83% | 1112 fps | 98% |
| Alliant UNIQUE | <<locked>> | 96% | 28,311 psi | 83% | 1129 fps | 98.2% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 28,398 psi | 83% | 1030 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 22,017 psi | 65% | 981 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 27,369 psi | 80% | 1053 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 27,992 psi | 82% | 1086 fps | 99.9% |
| Hodgdon Clays | <<locked>> | 92% | 28,340 psi | 83% | 955 fps | 100% |
| Hodgdon HP38² | <<locked>> | 68% | 30,356 psi | 89% | 1086 fps | 100% |
| Hodgdon HS-6* | <<locked>> | 80% | 29,834 psi | 88% | 1132 fps | 90.1% |
| Hodgdon Longshot*² | <<locked>> | 76% | 29,269 psi | 86% | 1129 fps | 92% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 9,456 psi | 28% | 696 fps | 98.8% |
| Hodgdon Universal | <<locked>> | 88% | 28,747 psi | 84% | 1099 fps | 100% |
| Lovex S011² | <<locked>> | 76% | 29,240 psi | 86% | 1053 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 30,066 psi | 88% | 1119 fps | 99.6% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 29,631 psi | 87% | 1086 fps | 100% |
| Maxam CSB 2ᴾ | <<locked>> | 100% | 29,486 psi | 87% | 1119 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 28,587 psi | 84% | 1060 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 29,370 psi | 86% | 1050 fps | 100% |
| Maxam CSB 5 | <<locked>> | 80% | 27,586 psi | 81% | 991 fps | 100% |
| Ramshot Silhouette | <<locked>> | 80% | 29,776 psi | 87% | 1132 fps | 96.9% |
| Ramshot True Blue*² | <<locked>> | 72% | 27,659 psi | 81% | 1102 fps | 91.2% |
| Ramshot Zip² | <<locked>> | 68% | 30,574 psi | 90% | 1093 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 28,340 psi | 83% | 1093 fps | 100% |
| ReloadSwiss RS 14*ᴾ | <<locked>> | 100% | 8,180 psi | 24% | 669 fps | 93.6% |
| ReloadSwiss RS 20ᴾ | <<locked>> | 100% | 28,718 psi | 84% | 1145 fps | 99.6% |
| Rottweil P 801² | <<locked>> | 76% | 26,687 psi | 78% | 1037 fps | 100% |
| SNPE Vectan A0ᴾ | <<locked>> | 100% | 30,821 psi | 90% | 1109 fps | 98.5% |
| SNPE Vectan A1 | <<locked>> | 88% | 29,921 psi | 88% | 1076 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 28,805 psi | 85% | 1066 fps | 99.8% |
| SNPE Vectan BA10² | <<locked>> | 76% | 28,355 psi | 83% | 955 fps | 100% |
| SNPE Vectan BA7 1/2*ᴾ | <<locked>> | 100% | 26,223 psi | 77% | 1066 fps | 89.3% |
| SNPE Vectan BA9 1/2 | <<locked>> | 92% | 30,008 psi | 88% | 1099 fps | 100% |
| Somchem MP200 | <<locked>> | 88% | 28,529 psi | 84% | 1112 fps | 97.2% |
| Somchem MS200 | <<locked>> | 92% | 28,950 psi | 85% | 1102 fps | 98.8% |
| Vihtavuori 3N37*ᴾ | <<locked>> | 100% | 29,544 psi | 87% | 1148 fps | 92.7% |
| Vihtavuori N310² | <<locked>> | 68% | 28,224 psi | 83% | 971 fps | 100% |
| Vihtavuori N320 | <<locked>> | 88% | 30,269 psi | 89% | 1076 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 17,245 psi | 51% | 860 fps | 100% |
| Vihtavuori N330 | <<locked>> | 88% | 27,876 psi | 82% | 1102 fps | 100% |
| Vihtavuori N340 | <<locked>> | 96% | 30,530 psi | 90% | 1125 fps | 98.8% |
| Vihtavuori N350*ᴾ | <<locked>> | 100% | 24,932 psi | 73% | 1076 fps | 90.4% |
| Winchester 231² | <<locked>> | 76% | 30,574 psi | 90% | 1093 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 29,240 psi | 86% | 1070 fps | 100% |
| Winchester 572*² | <<locked>> | 68% | 29,008 psi | 85% | 1132 fps | 91.1% |
| Winchester AutoComp | <<locked>> | 96% | 28,108 psi | 82% | 1086 fps | 99.9% |
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% | 14,939 psi | 44% | 833 fps | 85.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 15,040 psi | 44% | 814 fps | 99.8% |
| Accurate Solo 1250*² | <<locked>> | 60% | 11,356 psi | 33% | 764 fps | 91.8% |
| ADI AP 70N² | <<locked>> | 60% | 16,157 psi | 47% | 892 fps | 97.5% |
| ADI APS 350² | <<locked>> | 60% | 18,710 psi | 55% | 801 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 17,390 psi | 51% | 810 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 15,664 psi | 46% | 817 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 16,114 psi | 47% | 853 fps | 99.8% |
| Alliant BE-86² | <<locked>> | 60% | 11,951 psi | 35% | 791 fps | 95.6% |
| Alliant BULLSEYE*² | <<locked>> | 60% | 15,345 psi | 45% | 876 fps | 90.7% |
| Alliant Green Dot² | <<locked>> | 60% | 14,054 psi | 41% | 810 fps | 99.3% |
| Alliant Herco*² | <<locked>> | 76% | 12,517 psi | 37% | 817 fps | 86.3% |
| Alliant RED DOT² | <<locked>> | 60% | 14,504 psi | 43% | 810 fps | 100% |
| Alliant Sport Pistol*² | <<locked>> | 60% | 17,825 psi | 52% | 932 fps | 92.2% |
| Alliant UNIQUE*² | 3.1 gr | 64% | 12,502 psi | 37% | 817 fps | 86.1% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 13,242 psi | 39% | 787 fps | 97.9% |
| Baschieri & Pellagri 102 Pistol*² | <<locked>> | 60% | 7,992 psi | 23% | 676 fps | 94% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 13,750 psi | 40% | 837 fps | 99% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 21,103 psi | 62% | 984 fps | 98.5% |
| Hodgdon Clays² | <<locked>> | 60% | 14,330 psi | 42% | 755 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 23,656 psi | 69% | 997 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 72% | 23,090 psi | 68% | 1033 fps | 85.8% |
| Hodgdon Longshot*² | <<locked>> | 64% | 19,754 psi | 58% | 978 fps | 85.4% |
| Hodgdon TrailBoss*² | <<locked>> | 60% | 4,467 psi | 13% | 486 fps | 87.7% |
| Hodgdon Universal² | <<locked>> | 60% | 13,605 psi | 40% | 830 fps | 95.4% |
| Lovex S011² | <<locked>> | 60% | 18,623 psi | 55% | 899 fps | 99.1% |
| Lovex S020*² | 3.2 gr | 60% | 12,966 psi | 38% | 823 fps | 89.9% |
| Maxam CSB 1*² | <<locked>> | 60% | 11,023 psi | 32% | 748 fps | 91.4% |
| Maxam CSB 2² | <<locked>> | 60% | 10,370 psi | 30% | 781 fps | 96.5% |
| Maxam CSB 3² | <<locked>> | 60% | 12,734 psi | 37% | 791 fps | 97.5% |
| Maxam CSB 4² | <<locked>> | 60% | 14,460 psi | 42% | 823 fps | 99.8% |
| Maxam CSB 5² | <<locked>> | 60% | 16,592 psi | 49% | 840 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 16,259 psi | 48% | 902 fps | 87.9% |
| Ramshot True Blue*² | <<locked>> | 64% | 20,363 psi | 60% | 981 fps | 86% |
| Ramshot Zip² | <<locked>> | 60% | 22,669 psi | 67% | 988 fps | 99.9% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 14,330 psi | 42% | 876 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 72% | 5,337 psi | 16% | 541 fps | 85.6% |
| ReloadSwiss RS 20*² | <<locked>> | 64% | 11,502 psi | 34% | 801 fps | 86.5% |
| Rottweil P 801² | <<locked>> | 60% | 17,158 psi | 50% | 899 fps | 100% |
| SNPE Vectan A0*² | <<locked>> | 64% | 12,604 psi | 37% | 781 fps | 85.7% |
| SNPE Vectan A1² | <<locked>> | 60% | 14,852 psi | 44% | 833 fps | 97.1% |
| SNPE Vectan BA 9*² | <<locked>> | 60% | 14,199 psi | 42% | 817 fps | 92.9% |
| SNPE Vectan BA10² | <<locked>> | 60% | 19,856 psi | 58% | 846 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 92% | 21,176 psi | 62% | 984 fps | 85.6% |
| SNPE Vectan BA9 1/2*² | <<locked>> | 60% | 12,850 psi | 38% | 801 fps | 93.4% |
| Somchem MP200*² | <<locked>> | 60% | 13,706 psi | 40% | 833 fps | 86% |
| Somchem MS200*² | <<locked>> | 60% | 12,778 psi | 37% | 797 fps | 87.8% |
| Vihtavuori 3N37* | <<locked>> | 84% | 19,609 psi | 58% | 988 fps | 86% |
| Vihtavuori N310² | <<locked>> | 60% | 23,221 psi | 68% | 915 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 13,547 psi | 40% | 823 fps | 99.7% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 6,933 psi | 20% | 620 fps | 99.1% |
| Vihtavuori N330² | <<locked>> | 60% | 12,415 psi | 36% | 827 fps | 95.2% |
| Vihtavuori N340*² | 3.1 gr | 60% | 11,661 psi | 34% | 781 fps | 85.2% |
| Vihtavuori N350* | <<locked>> | 88% | 18,753 psi | 55% | 965 fps | 85.3% |
| Winchester 231² | <<locked>> | 60% | 18,275 psi | 54% | 912 fps | 98.8% |
| Winchester 244² | <<locked>> | 60% | 26,440 psi | 78% | 1037 fps | 100% |
| Winchester 572*² | <<locked>> | 60% | 22,060 psi | 65% | 1020 fps | 86.4% |
| Winchester AutoComp *² | <<locked>> | 60% | 11,139 psi | 33% | 764 fps | 90% |
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 58 powders for 9 x 21 loaded with the .355 | 124gr | Geco HEXAGON. Vihtavuori 3N37 delivers the highest muzzle velocity at 1,148 fps; across all powders the maximum-charge window runs from 669 fps to 1,148 fps. Alliant Herco gives the best case fill at 100 %, and 45 of the 58 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (235 MPa), the top charges use 24–90 %, 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, Vihtavuori N340, Lovex S020 rank at the top here: for 9 x 21 with the .355 | 124gr | Geco HEXAGON they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon HS-6, Hodgdon Longshot, Ramshot True Blue 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.