Load Specifications
Load data in caliber 9 x 21 with .355 | 121gr | Frontier Bullets CMJ FP atch 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 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% | 29,051 psi | 85% | 1132 fps | 97.1% |
| Accurate No. 5*² | <<locked>> | 68% | 30,313 psi | 89% | 1214 fps | 89.8% |
| Accurate Solo 1000 | <<locked>> | 80% | 29,486 psi | 87% | 1083 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 88% | 29,979 psi | 88% | 1145 fps | 100% |
| ADI AP 70N² | <<locked>> | 72% | 29,849 psi | 88% | 1155 fps | 100% |
| ADI APS 350² | <<locked>> | 72% | 28,224 psi | 83% | 965 fps | 100% |
| ADI APS 450² | <<locked>> | 76% | 29,269 psi | 86% | 1010 fps | 100% |
| ADI AS 30 | <<locked>> | 80% | 29,182 psi | 86% | 1053 fps | 100% |
| ADI AS 50N² | <<locked>> | 76% | 28,674 psi | 84% | 1089 fps | 100% |
| Alliant BE-86 | <<locked>> | 84% | 28,456 psi | 83% | 1122 fps | 100% |
| Alliant BULLSEYE² | <<locked>> | 76% | 29,182 psi | 86% | 1181 fps | 99.4% |
| Alliant Green Dot | <<locked>> | 80% | 29,515 psi | 87% | 1102 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 27,064 psi | 79% | 1152 fps | 98.6% |
| Alliant RED DOT | <<locked>> | 84% | 30,690 psi | 90% | 1093 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 72% | 30,371 psi | 89% | 1201 fps | 99.3% |
| Alliant UNIQUE | <<locked>> | 88% | 29,733 psi | 87% | 1198 fps | 99.2% |
| Baschieri & Pellagri 100 | <<locked>> | 80% | 28,950 psi | 85% | 1086 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 27,644 psi | 81% | 1093 fps | 100% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 76% | 27,340 psi | 80% | 1093 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 30,226 psi | 89% | 1165 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 30,429 psi | 89% | 1024 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 72% | 28,616 psi | 84% | 1175 fps | 91.2% |
| Hodgdon Longshot*² | <<locked>> | 68% | 28,500 psi | 84% | 1178 fps | 93.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 12,473 psi | 37% | 781 fps | 100% |
| Hodgdon Universal | <<locked>> | 80% | 29,849 psi | 88% | 1155 fps | 100% |
| Lovex D036*² | <<locked>> | 68% | 30,255 psi | 89% | 1211 fps | 89.8% |
| Lovex S011² | <<locked>> | 72% | 30,574 psi | 90% | 1122 fps | 100% |
| Lovex S020 | <<locked>> | 80% | 29,791 psi | 87% | 1168 fps | 99.9% |
| Maxam CSB 1 | <<locked>> | 92% | 30,632 psi | 90% | 1148 fps | 100% |
| Maxam CSB 2 | <<locked>> | 88% | 29,269 psi | 86% | 1155 fps | 100% |
| Maxam CSB 3 | <<locked>> | 84% | 29,153 psi | 86% | 1112 fps | 100% |
| Maxam CSB 4 | <<locked>> | 80% | 28,892 psi | 85% | 1089 fps | 100% |
| Maxam CSB 5² | <<locked>> | 76% | 29,341 psi | 86% | 1053 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 72% | 28,500 psi | 84% | 1171 fps | 97.5% |
| Ramshot True Blue*² | <<locked>> | 68% | 29,051 psi | 85% | 1178 fps | 93.6% |
| ReloadSwiss RS 12² | <<locked>> | 76% | 29,138 psi | 85% | 1135 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,821 psi | 35% | 781 fps | 98.8% |
| ReloadSwiss RS 20 | <<locked>> | 92% | 29,051 psi | 85% | 1201 fps | 99.9% |
| Rottweil P 801² | <<locked>> | 68% | 27,702 psi | 81% | 1083 fps | 100% |
| Rottweil P 806*ᴾ | <<locked>> | 100% | 27,195 psi | 80% | 1266 fps | 91.6% |
| Shooters World Auto Pistol*² | <<locked>> | 68% | 30,255 psi | 89% | 1211 fps | 89.8% |
| SNPE Vectan A0 | <<locked>> | 92% | 30,734 psi | 90% | 1165 fps | 99.2% |
| SNPE Vectan A1 | <<locked>> | 80% | 30,240 psi | 89% | 1129 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 80% | 29,095 psi | 85% | 1125 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 30,574 psi | 90% | 1027 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 96% | 29,530 psi | 87% | 1175 fps | 93% |
| SNPE Vectan BA9 1/2 | <<locked>> | 80% | 27,644 psi | 81% | 1115 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 84% | 27,050 psi | 79% | 1220 fps | 87.2% |
| Somchem MP200 | <<locked>> | 80% | 29,196 psi | 86% | 1171 fps | 98.3% |
| Somchem MS200 | <<locked>> | 84% | 28,805 psi | 85% | 1152 fps | 99.4% |
| Vihtavuori 3N37* | <<locked>> | 92% | 30,792 psi | 90% | 1224 fps | 94.8% |
| Vihtavuori N310² | <<locked>> | 64% | 30,632 psi | 90% | 1037 fps | 100% |
| Vihtavuori N320² | <<locked>> | 76% | 27,253 psi | 80% | 1079 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 21,654 psi | 64% | 948 fps | 100% |
| Vihtavuori N330 | <<locked>> | 80% | 28,224 psi | 83% | 1148 fps | 100% |
| Vihtavuori N340 | <<locked>> | 84% | 28,529 psi | 84% | 1152 fps | 99% |
| Vihtavuori N350* | <<locked>> | 96% | 28,906 psi | 85% | 1191 fps | 94.3% |
| Winchester 231² | <<locked>> | 68% | 29,196 psi | 86% | 1125 fps | 100% |
| Winchester AutoComp | <<locked>> | 88% | 29,689 psi | 87% | 1155 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% | 16,592 psi | 49% | 912 fps | 89.4% |
| Accurate No. 5*² | <<locked>> | 60% | 23,859 psi | 70% | 1102 fps | 85.6% |
| Accurate Solo 1000² | <<locked>> | 60% | 18,536 psi | 54% | 915 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 14,663 psi | 43% | 873 fps | 96.7% |
| ADI AP 70N² | <<locked>> | 60% | 21,654 psi | 64% | 1027 fps | 99.9% |
| ADI APS 350² | <<locked>> | 60% | 21,770 psi | 64% | 879 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 19,914 psi | 58% | 883 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 19,043 psi | 56% | 902 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 20,030 psi | 59% | 955 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 15,635 psi | 46% | 902 fps | 99.1% |
| Alliant BULLSEYE² | <<locked>> | 60% | 19,058 psi | 56% | 997 fps | 95.4% |
| Alliant Green Dot² | <<locked>> | 60% | 18,014 psi | 53% | 919 fps | 100% |
| Alliant Herco*² | <<locked>> | 60% | 11,632 psi | 34% | 801 fps | 86.4% |
| Alliant RED DOT² | <<locked>> | 60% | 18,173 psi | 53% | 902 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 60% | 21,161 psi | 62% | 1040 fps | 96% |
| Alliant UNIQUE*² | 3.6 gr | 60% | 15,142 psi | 44% | 909 fps | 91.1% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 16,795 psi | 49% | 892 fps | 99.9% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 11,095 psi | 33% | 781 fps | 98.8% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 17,883 psi | 52% | 948 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 27,050 psi | 79% | 1119 fps | 100% |
| Hodgdon Clays² | <<locked>> | 60% | 17,100 psi | 50% | 833 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 64% | 22,597 psi | 66% | 1073 fps | 87.3% |
| Hodgdon Longshot*² | <<locked>> | 60% | 21,567 psi | 63% | 1056 fps | 88.8% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 7,005 psi | 21% | 591 fps | 96.7% |
| Hodgdon Universal² | <<locked>> | 60% | 18,173 psi | 53% | 958 fps | 99.2% |
| Lovex D036*² | <<locked>> | 60% | 23,815 psi | 70% | 1102 fps | 85.5% |
| Lovex S011² | <<locked>> | 60% | 22,394 psi | 66% | 1004 fps | 100% |
| Lovex S020² | <<locked>> | 60% | 16,940 psi | 50% | 945 fps | 95.3% |
| Maxam CSB 1² | <<locked>> | 60% | 14,272 psi | 42% | 856 fps | 96.4% |
| Maxam CSB 2² | <<locked>> | 60% | 14,475 psi | 42% | 899 fps | 99.8% |
| Maxam CSB 3² | <<locked>> | 60% | 16,288 psi | 48% | 899 fps | 99.8% |
| Maxam CSB 4² | <<locked>> | 60% | 18,202 psi | 53% | 925 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 19,827 psi | 58% | 919 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 20,494 psi | 60% | 1030 fps | 93.4% |
| Ramshot True Blue*² | <<locked>> | 60% | 22,843 psi | 67% | 1073 fps | 89.8% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 18,811 psi | 55% | 978 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 6,701 psi | 20% | 577 fps | 91.8% |
| ReloadSwiss RS 20*² | 3.7 gr | 60% | 12,908 psi | 38% | 866 fps | 90.7% |
| Rottweil P 801² | <<locked>> | 60% | 22,408 psi | 66% | 1007 fps | 100% |
| Rottweil P 806* | <<locked>> | 88% | 19,189 psi | 56% | 1112 fps | 85.1% |
| Shooters World Auto Pistol*² | <<locked>> | 60% | 23,815 psi | 70% | 1102 fps | 85.5% |
| SNPE Vectan A0*² | 3.6 gr | 60% | 14,489 psi | 43% | 860 fps | 90% |
| SNPE Vectan A1² | <<locked>> | 60% | 18,101 psi | 53% | 935 fps | 99.5% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 17,376 psi | 51% | 922 fps | 96.9% |
| SNPE Vectan BA10² | <<locked>> | 60% | 22,060 psi | 65% | 915 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 80% | 20,291 psi | 60% | 1014 fps | 86.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 16,737 psi | 49% | 922 fps | 97.8% |
| SNPE Vectan SP 2* | <<locked>> | 80% | 24,308 psi | 71% | 1171 fps | 85.2% |
| Somchem MP200*² | <<locked>> | 60% | 17,085 psi | 50% | 945 fps | 91.5% |
| Somchem MS200*² | <<locked>> | 60% | 15,679 psi | 46% | 899 fps | 92.8% |
| Vihtavuori 3N37*² | <<locked>> | 72% | 17,883 psi | 52% | 991 fps | 86% |
| Vihtavuori N310² | <<locked>> | 60% | 27,775 psi | 81% | 1004 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 17,695 psi | 52% | 932 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,819 psi | 29% | 702 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 16,520 psi | 48% | 951 fps | 99.1% |
| Vihtavuori N340*² | <<locked>> | 60% | 15,258 psi | 45% | 899 fps | 91.6% |
| Vihtavuori N350*² | <<locked>> | 76% | 17,767 psi | 52% | 988 fps | 86.2% |
| Winchester 231² | <<locked>> | 60% | 22,887 psi | 67% | 1030 fps | 100% |
| Winchester AutoComp ² | <<locked>> | 60% | 14,634 psi | 43% | 876 fps | 95.5% |
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 | 121gr | Frontier Bullets CMJ FP atch. Rottweil P 806 delivers the highest muzzle velocity at 1,266 fps; across all powders the maximum-charge window runs from 781 fps to 1,266 fps. Alliant Herco gives the best case fill at 100 %, and 36 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 35–90 %, 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 .355 | 121gr | Frontier Bullets CMJ FP atch 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.