Load Specifications
Load data in caliber 9 x 21 with .355 | 124gr | Geco FMJ bullet and 59 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N330, Alliant UNIQUE 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% | 28,253 psi | 83% | 1063 fps | 95.4% |
| Accurate Solo 1000 | <<locked>> | 88% | 30,052 psi | 88% | 1043 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 96% | 30,023 psi | 88% | 1096 fps | 100% |
| ADI AP 70N | <<locked>> | 80% | 29,936 psi | 88% | 1115 fps | 100% |
| ADI APS 350 | <<locked>> | 80% | 29,240 psi | 86% | 932 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 28,094 psi | 82% | 955 fps | 100% |
| ADI AS 30 | <<locked>> | 88% | 30,081 psi | 88% | 1024 fps | 100% |
| ADI AS 50N | <<locked>> | 84% | 28,239 psi | 83% | 1043 fps | 100% |
| Alliant BE-86 | <<locked>> | 92% | 28,674 psi | 84% | 1079 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 84% | 30,414 psi | 89% | 1145 fps | 99.1% |
| Alliant Green Dot | <<locked>> | 92% | 30,719 psi | 90% | 1076 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 21,741 psi | 64% | 1024 fps | 95.5% |
| Alliant RED DOT | <<locked>> | 92% | 30,052 psi | 88% | 1047 fps | 100% |
| Alliant Sport Pistol | <<locked>> | 80% | 30,792 psi | 90% | 1148 fps | 98.8% |
| Alliant UNIQUEᴾ | <<locked>> | 100% | 30,647 psi | 90% | 1161 fps | 98.9% |
| Baschieri & Pellagri 100 | <<locked>> | 88% | 28,123 psi | 83% | 1030 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 21,872 psi | 64% | 981 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 84% | 28,253 psi | 83% | 1066 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 68% | 27,717 psi | 81% | 1086 fps | 99.9% |
| Hodgdon Clays | <<locked>> | 92% | 29,602 psi | 87% | 968 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 27,296 psi | 80% | 1050 fps | 100% |
| Hodgdon HS-6* | <<locked>> | 80% | 30,792 psi | 90% | 1148 fps | 90.7% |
| Hodgdon Longshot*² | <<locked>> | 76% | 28,950 psi | 85% | 1129 fps | 92% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 9,398 psi | 28% | 692 fps | 98.8% |
| Hodgdon Universal | <<locked>> | 88% | 28,500 psi | 84% | 1099 fps | 100% |
| Lovex S011² | <<locked>> | 76% | 28,993 psi | 85% | 1050 fps | 100% |
| Lovex S020 | <<locked>> | 88% | 29,849 psi | 88% | 1115 fps | 99.5% |
| Maxam CSB 1ᴾ | <<locked>> | 100% | 29,370 psi | 86% | 1086 fps | 100% |
| Maxam CSB 2ᴾ | <<locked>> | 100% | 30,719 psi | 90% | 1135 fps | 100% |
| Maxam CSB 3 | <<locked>> | 92% | 29,820 psi | 87% | 1076 fps | 100% |
| Maxam CSB 4 | <<locked>> | 88% | 29,037 psi | 85% | 1050 fps | 100% |
| Maxam CSB 5 | <<locked>> | 84% | 30,632 psi | 90% | 1024 fps | 100% |
| Ramshot Silhouette | <<locked>> | 80% | 29,472 psi | 86% | 1132 fps | 96.8% |
| Ramshot True Blue*² | <<locked>> | 72% | 27,369 psi | 80% | 1099 fps | 91.1% |
| Ramshot Zip² | <<locked>> | 68% | 30,298 psi | 89% | 1093 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 84% | 28,108 psi | 82% | 1093 fps | 100% |
| ReloadSwiss RS 14*ᴾ | <<locked>> | 100% | 8,151 psi | 24% | 669 fps | 93.6% |
| ReloadSwiss RS 20ᴾ | <<locked>> | 100% | 28,442 psi | 83% | 1145 fps | 99.5% |
| Rottweil P 801² | <<locked>> | 76% | 27,920 psi | 82% | 1053 fps | 100% |
| SNPE Vectan A0ᴾ | <<locked>> | 100% | 30,545 psi | 90% | 1106 fps | 98.5% |
| SNPE Vectan A1 | <<locked>> | 84% | 28,311 psi | 83% | 1056 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 88% | 29,849 psi | 88% | 1083 fps | 99.9% |
| SNPE Vectan BA10² | <<locked>> | 76% | 29,689 psi | 87% | 971 fps | 100% |
| SNPE Vectan BA7 1/2*ᴾ | <<locked>> | 100% | 25,947 psi | 76% | 1063 fps | 89.2% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 28,282 psi | 83% | 1079 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 96% | 29,124 psi | 85% | 1204 fps | 86.9% |
| Somchem MP200 | <<locked>> | 88% | 29,588 psi | 87% | 1129 fps | 97.6% |
| Somchem MS200 | <<locked>> | 92% | 28,674 psi | 84% | 1099 fps | 98.8% |
| Vihtavuori 3N37*ᴾ | <<locked>> | 100% | 30,603 psi | 90% | 1165 fps | 93.3% |
| Vihtavuori N310² | <<locked>> | 68% | 29,747 psi | 87% | 988 fps | 100% |
| Vihtavuori N320 | <<locked>> | 88% | 29,994 psi | 88% | 1073 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 17,100 psi | 50% | 860 fps | 100% |
| Vihtavuori N330 | <<locked>> | 92% | 30,676 psi | 90% | 1135 fps | 100% |
| Vihtavuori N340 | <<locked>> | 96% | 30,211 psi | 89% | 1122 fps | 98.7% |
| Vihtavuori N350*ᴾ | <<locked>> | 100% | 25,831 psi | 76% | 1093 fps | 91.1% |
| Winchester 231² | <<locked>> | 76% | 30,298 psi | 89% | 1093 fps | 100% |
| Winchester 244² | <<locked>> | 64% | 30,443 psi | 89% | 1086 fps | 100% |
| Winchester 572*² | <<locked>> | 68% | 29,979 psi | 88% | 1148 fps | 91.7% |
| Winchester AutoComp | <<locked>> | 96% | 29,051 psi | 85% | 1099 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% | 14,794 psi | 43% | 833 fps | 85.5% |
| Accurate Solo 1000² | <<locked>> | 60% | 14,924 psi | 44% | 814 fps | 99.8% |
| Accurate Solo 1250*² | <<locked>> | 60% | 11,269 psi | 33% | 761 fps | 91.8% |
| ADI AP 70N² | <<locked>> | 60% | 16,998 psi | 50% | 912 fps | 98% |
| ADI APS 350² | <<locked>> | 60% | 18,579 psi | 55% | 801 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 17,274 psi | 51% | 807 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 15,548 psi | 46% | 817 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 16,041 psi | 47% | 853 fps | 99.8% |
| Alliant BE-86² | <<locked>> | 60% | 11,908 psi | 35% | 791 fps | 95.6% |
| Alliant BULLSEYE*² | <<locked>> | 60% | 15,229 psi | 45% | 873 fps | 90.6% |
| Alliant Green Dot² | <<locked>> | 60% | 14,881 psi | 44% | 830 fps | 99.6% |
| Alliant Herco*² | <<locked>> | 72% | 11,821 psi | 35% | 797 fps | 85.2% |
| Alliant RED DOT² | <<locked>> | 60% | 14,417 psi | 42% | 810 fps | 100% |
| Alliant Sport Pistol*² | <<locked>> | 60% | 17,680 psi | 52% | 928 fps | 92.2% |
| Alliant UNIQUE*² | 3.2 gr | 64% | 13,155 psi | 39% | 837 fps | 87.2% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 13,169 psi | 39% | 787 fps | 97.9% |
| Baschieri & Pellagri 102 Pistol*² | <<locked>> | 60% | 7,948 psi | 23% | 673 fps | 93.9% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 13,663 psi | 40% | 833 fps | 99% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 20,871 psi | 61% | 984 fps | 98.4% |
| Hodgdon Clays² | <<locked>> | 60% | 14,214 psi | 42% | 755 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 23,453 psi | 69% | 997 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 72% | 22,945 psi | 67% | 1030 fps | 85.7% |
| Hodgdon Longshot*² | <<locked>> | 64% | 19,580 psi | 57% | 974 fps | 85.4% |
| Hodgdon TrailBoss*² | <<locked>> | 60% | 4,467 psi | 13% | 486 fps | 87.8% |
| Hodgdon Universal² | <<locked>> | 60% | 13,489 psi | 40% | 830 fps | 95.4% |
| Lovex S011² | <<locked>> | 60% | 18,478 psi | 54% | 896 fps | 99% |
| Lovex S020*² | <<locked>> | 60% | 12,908 psi | 38% | 823 fps | 89.9% |
| Maxam CSB 1*² | <<locked>> | 60% | 10,936 psi | 32% | 748 fps | 91.3% |
| Maxam CSB 2² | <<locked>> | 60% | 10,312 psi | 30% | 781 fps | 96.5% |
| Maxam CSB 3² | <<locked>> | 60% | 12,676 psi | 37% | 791 fps | 97.5% |
| Maxam CSB 4² | <<locked>> | 60% | 14,373 psi | 42% | 820 fps | 99.8% |
| Maxam CSB 5² | <<locked>> | 60% | 16,520 psi | 48% | 837 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 16,172 psi | 47% | 899 fps | 87.9% |
| Ramshot True Blue*² | <<locked>> | 64% | 21,118 psi | 62% | 997 fps | 86.8% |
| Ramshot Zip² | <<locked>> | 60% | 23,641 psi | 69% | 1004 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 14,257 psi | 42% | 876 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 72% | 5,308 psi | 16% | 541 fps | 85.6% |
| ReloadSwiss RS 20*² | <<locked>> | 64% | 11,400 psi | 33% | 797 fps | 86.4% |
| Rottweil P 801² | <<locked>> | 60% | 17,085 psi | 50% | 899 fps | 100% |
| SNPE Vectan A0*² | <<locked>> | 64% | 12,546 psi | 37% | 778 fps | 85.6% |
| SNPE Vectan A1² | <<locked>> | 60% | 14,736 psi | 43% | 833 fps | 97.1% |
| SNPE Vectan BA 9*² | <<locked>> | 60% | 14,127 psi | 41% | 817 fps | 92.9% |
| SNPE Vectan BA10² | <<locked>> | 60% | 19,711 psi | 58% | 846 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 92% | 21,886 psi | 64% | 1001 fps | 86.3% |
| SNPE Vectan BA9 1/2*² | <<locked>> | 60% | 13,532 psi | 40% | 820 fps | 94.2% |
| SNPE Vectan SP 2* | <<locked>> | 92% | 26,731 psi | 78% | 1168 fps | 85.3% |
| Somchem MP200*² | 3.4 gr | 60% | 13,619 psi | 40% | 833 fps | 85.9% |
| Somchem MS200*² | <<locked>> | 60% | 12,691 psi | 37% | 797 fps | 87.7% |
| Vihtavuori 3N37* | <<locked>> | 84% | 19,392 psi | 57% | 988 fps | 85.9% |
| Vihtavuori N310² | <<locked>> | 60% | 23,047 psi | 68% | 912 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 13,445 psi | 39% | 823 fps | 99.7% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 6,889 psi | 20% | 617 fps | 99.1% |
| Vihtavuori N330² | 3.1 gr | 60% | 12,299 psi | 36% | 827 fps | 95.1% |
| Vihtavuori N340*² | <<locked>> | 60% | 11,574 psi | 34% | 778 fps | 85.1% |
| Vihtavuori N350* | <<locked>> | 88% | 18,623 psi | 55% | 965 fps | 85.3% |
| Winchester 231² | <<locked>> | 60% | 19,160 psi | 56% | 932 fps | 99.2% |
| Winchester 244² | <<locked>> | 60% | 26,208 psi | 77% | 1033 fps | 100% |
| Winchester 572*² | <<locked>> | 60% | 21,843 psi | 64% | 1020 fps | 86.4% |
| Winchester AutoComp *² | <<locked>> | 60% | 11,037 psi | 32% | 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 59 powders for 9 x 21 loaded with the .355 | 124gr | Geco FMJ. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,204 fps; across all powders the maximum-charge window runs from 669 fps to 1,204 fps. Alliant Herco gives the best case fill at 100 %, and 47 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 24–90 %, leaving at least 10 % headroom. Alliant Herco, Alliant UNIQUE, 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. Vihtavuori N330, Alliant UNIQUE, Somchem MP200 rank at the top here: for 9 x 21 with the .355 | 124gr | Geco FMJ 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.