Load Specifications
Load data in caliber 9 x 21 with .355 | 124gr | Nosler Assured Stopping Power bullet and 62 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>> | 84% | 30,284 psi | 89% | 1132 fps | 97.4% |
| Accurate No. 5*² | <<locked>> | 68% | 28,181 psi | 83% | 1161 fps | 88.6% |
| Accurate Solo 1000 | <<locked>> | 84% | 30,269 psi | 89% | 1076 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 88% | 28,137 psi | 83% | 1106 fps | 100% |
| ADI AP 70N² | <<locked>> | 76% | 29,646 psi | 87% | 1142 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 28,979 psi | 85% | 958 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 30,226 psi | 89% | 1007 fps | 100% |
| ADI AS 30 | <<locked>> | 84% | 29,327 psi | 86% | 1043 fps | 100% |
| ADI AS 50N | <<locked>> | 80% | 28,689 psi | 84% | 1076 fps | 100% |
| Alliant BE-86 | <<locked>> | 88% | 28,906 psi | 85% | 1112 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 80% | 29,994 psi | 88% | 1175 fps | 99.6% |
| Alliant Green Dot | <<locked>> | 84% | 28,297 psi | 83% | 1076 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 23,989 psi | 70% | 1093 fps | 97.6% |
| Alliant RED DOT | <<locked>> | 84% | 27,992 psi | 82% | 1050 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 72% | 27,644 psi | 81% | 1142 fps | 98.7% |
| Alliant UNIQUE | <<locked>> | 92% | 28,660 psi | 84% | 1168 fps | 99% |
| Baschieri & Pellagri 100 | <<locked>> | 84% | 28,152 psi | 83% | 1060 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 24,729 psi | 73% | 1043 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 80% | 28,790 psi | 84% | 1099 fps | 100% |
| Hodgdon CFE Pistol² | <<locked>> | 64% | 27,137 psi | 80% | 1109 fps | 100% |
| Hodgdon Clays | <<locked>> | 88% | 28,674 psi | 84% | 988 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 29,660 psi | 87% | 1109 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 76% | 29,428 psi | 86% | 1171 fps | 91.7% |
| Hodgdon Longshot*² | <<locked>> | 72% | 29,225 psi | 86% | 1171 fps | 93.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 10,544 psi | 31% | 741 fps | 99.8% |
| Hodgdon Universal | <<locked>> | 84% | 29,646 psi | 87% | 1142 fps | 100% |
| Lovex D036*² | <<locked>> | 68% | 28,123 psi | 83% | 1161 fps | 88.5% |
| Lovex S011² | <<locked>> | 72% | 28,921 psi | 85% | 1083 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 30,342 psi | 89% | 1158 fps | 99.9% |
| Maxam CSB 1 | <<locked>> | 96% | 30,008 psi | 88% | 1125 fps | 100% |
| Maxam CSB 2 | <<locked>> | 92% | 29,138 psi | 85% | 1142 fps | 100% |
| Maxam CSB 3 | <<locked>> | 88% | 29,718 psi | 87% | 1106 fps | 100% |
| Maxam CSB 4 | <<locked>> | 84% | 29,443 psi | 86% | 1083 fps | 100% |
| Maxam CSB 5 | <<locked>> | 80% | 29,863 psi | 88% | 1043 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 29,240 psi | 86% | 1165 fps | 97.7% |
| Ramshot True Blue*² | <<locked>> | 68% | 26,818 psi | 79% | 1129 fps | 92.4% |
| Ramshot Zip² | <<locked>> | 64% | 29,747 psi | 87% | 1115 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 80% | 28,529 psi | 84% | 1122 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 9,152 psi | 27% | 719 fps | 96.3% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 29,820 psi | 87% | 1198 fps | 100% |
| Rottweil P 801² | <<locked>> | 72% | 28,355 psi | 83% | 1083 fps | 100% |
| Rottweil P 806*ᴾ | <<locked>> | 100% | 22,887 psi | 67% | 1181 fps | 88.8% |
| Shooters World Auto Pistol*² | <<locked>> | 68% | 28,123 psi | 83% | 1161 fps | 88.5% |
| SNPE Vectan A0 | <<locked>> | 96% | 30,545 psi | 90% | 1145 fps | 99.2% |
| SNPE Vectan A1 | <<locked>> | 80% | 27,644 psi | 81% | 1083 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 84% | 30,023 psi | 88% | 1122 fps | 100% |
| SNPE Vectan BA10² | <<locked>> | 72% | 28,834 psi | 85% | 991 fps | 100% |
| SNPE Vectan BA7 1/2*ᴾ | <<locked>> | 100% | 29,399 psi | 86% | 1155 fps | 92.8% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 30,385 psi | 89% | 1142 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 92% | 30,487 psi | 89% | 1263 fps | 89.4% |
| Somchem MP200 | <<locked>> | 84% | 29,602 psi | 87% | 1165 fps | 98.4% |
| Somchem MS200 | <<locked>> | 88% | 29,167 psi | 86% | 1142 fps | 99.5% |
| Vihtavuori 3N37* | <<locked>> | 96% | 30,618 psi | 90% | 1204 fps | 94.7% |
| Vihtavuori N310² | <<locked>> | 64% | 27,963 psi | 82% | 994 fps | 100% |
| Vihtavuori N320 | <<locked>> | 84% | 30,168 psi | 89% | 1106 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 19,000 psi | 56% | 906 fps | 100% |
| Vihtavuori N330 | <<locked>> | 84% | 28,674 psi | 84% | 1142 fps | 100% |
| Vihtavuori N340 | <<locked>> | 88% | 27,847 psi | 82% | 1129 fps | 98.9% |
| Vihtavuori N350*ᴾ | <<locked>> | 100% | 28,790 psi | 84% | 1175 fps | 94.3% |
| Winchester 231² | <<locked>> | 72% | 29,747 psi | 87% | 1115 fps | 100% |
| Winchester 572*² | <<locked>> | 64% | 28,558 psi | 84% | 1168 fps | 92.5% |
| Winchester AutoComp | <<locked>> | 92% | 28,906 psi | 85% | 1132 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% | 14,692 psi | 43% | 860 fps | 87.2% |
| Accurate No. 5*² | <<locked>> | 64% | 24,250 psi | 71% | 1096 fps | 85.9% |
| Accurate Solo 1000² | <<locked>> | 60% | 16,418 psi | 48% | 869 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 13,184 psi | 39% | 837 fps | 95.4% |
| ADI AP 70N² | <<locked>> | 60% | 18,884 psi | 55% | 974 fps | 99.4% |
| ADI APS 350² | <<locked>> | 60% | 19,464 psi | 57% | 837 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 18,942 psi | 56% | 856 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 16,331 psi | 48% | 853 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 17,448 psi | 51% | 906 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 13,373 psi | 39% | 850 fps | 97.9% |
| Alliant BULLSEYE*² | <<locked>> | 60% | 17,085 psi | 50% | 945 fps | 93.9% |
| Alliant Green Dot² | <<locked>> | 60% | 16,346 psi | 48% | 883 fps | 100% |
| Alliant Herco*² | <<locked>> | 68% | 11,850 psi | 35% | 820 fps | 86.8% |
| Alliant RED DOT² | <<locked>> | 60% | 15,345 psi | 45% | 850 fps | 100% |
| Alliant Sport Pistol*² | <<locked>> | 60% | 19,276 psi | 57% | 994 fps | 94.8% |
| Alliant UNIQUE*² | 3.4 gr | 60% | 12,705 psi | 37% | 846 fps | 88% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 15,243 psi | 45% | 856 fps | 99.6% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 8,818 psi | 26% | 722 fps | 96.5% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 15,229 psi | 45% | 892 fps | 99.9% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 23,960 psi | 70% | 1063 fps | 99.8% |
| Hodgdon Clays² | <<locked>> | 60% | 14,953 psi | 44% | 787 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 26,078 psi | 77% | 1063 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 64% | 20,247 psi | 59% | 1017 fps | 85.3% |
| Hodgdon Longshot*² | <<locked>> | 60% | 19,131 psi | 56% | 997 fps | 86.7% |
| Hodgdon TrailBoss*² | <<locked>> | 60% | 5,105 psi | 15% | 535 fps | 91.7% |
| Hodgdon Universal² | <<locked>> | 60% | 15,476 psi | 45% | 902 fps | 97.9% |
| Lovex D036*² | <<locked>> | 64% | 24,207 psi | 71% | 1096 fps | 85.8% |
| Lovex S011² | <<locked>> | 60% | 20,479 psi | 60% | 961 fps | 99.9% |
| Lovex S020*² | <<locked>> | 60% | 14,591 psi | 43% | 889 fps | 93.3% |
| Maxam CSB 1*² | <<locked>> | 60% | 12,053 psi | 35% | 801 fps | 94.2% |
| Maxam CSB 2² | <<locked>> | 60% | 11,661 psi | 34% | 837 fps | 98.5% |
| Maxam CSB 3² | <<locked>> | 60% | 14,808 psi | 43% | 863 fps | 99.4% |
| Maxam CSB 4² | <<locked>> | 60% | 15,853 psi | 47% | 876 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 18,376 psi | 54% | 892 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 17,912 psi | 53% | 968 fps | 91.2% |
| Ramshot True Blue*² | <<locked>> | 60% | 20,421 psi | 60% | 1020 fps | 87.9% |
| Ramshot Zip² | <<locked>> | 60% | 26,121 psi | 77% | 1070 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 16,563 psi | 49% | 942 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 64% | 4,989 psi | 15% | 535 fps | 85.8% |
| ReloadSwiss RS 20*² | 3.6 gr | 60% | 11,473 psi | 34% | 827 fps | 88.3% |
| Rottweil P 801² | <<locked>> | 60% | 19,363 psi | 57% | 958 fps | 100% |
| Rottweil P 806* | <<locked>> | 96% | 20,508 psi | 60% | 1135 fps | 86.7% |
| Shooters World Auto Pistol*² | <<locked>> | 64% | 24,207 psi | 71% | 1096 fps | 85.8% |
| SNPE Vectan A0*² | <<locked>> | 60% | 12,618 psi | 37% | 807 fps | 87.4% |
| SNPE Vectan A1² | <<locked>> | 60% | 16,244 psi | 48% | 892 fps | 98.8% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 15,563 psi | 46% | 876 fps | 95.5% |
| SNPE Vectan BA10² | <<locked>> | 60% | 21,176 psi | 62% | 892 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 84% | 20,160 psi | 59% | 1004 fps | 86.7% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 14,518 psi | 43% | 869 fps | 96.3% |
| SNPE Vectan SP 2* | <<locked>> | 84% | 24,149 psi | 71% | 1161 fps | 85.2% |
| Somchem MP200*² | <<locked>> | 60% | 14,953 psi | 44% | 892 fps | 89.2% |
| Somchem MS200*² | 3.5 gr | 60% | 14,272 psi | 42% | 866 fps | 91.4% |
| Vihtavuori 3N37*² | <<locked>> | 76% | 18,101 psi | 53% | 991 fps | 86.4% |
| Vihtavuori N310² | <<locked>> | 60% | 24,961 psi | 73% | 958 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 15,954 psi | 47% | 896 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 7,687 psi | 23% | 659 fps | 99.9% |
| Vihtavuori N330² | <<locked>> | 60% | 14,141 psi | 41% | 896 fps | 97.8% |
| Vihtavuori N340*² | <<locked>> | 60% | 13,082 psi | 38% | 843 fps | 89% |
| Vihtavuori N350* | <<locked>> | 80% | 17,434 psi | 51% | 974 fps | 85.9% |
| Winchester 231² | <<locked>> | 60% | 20,784 psi | 61% | 988 fps | 99.9% |
| Winchester 572*² | <<locked>> | 60% | 25,295 psi | 74% | 1115 fps | 90.6% |
| Winchester AutoComp *² | <<locked>> | 60% | 12,343 psi | 36% | 820 fps | 93.1% |
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 62 powders for 9 x 21 loaded with the .355 | 124gr | Nosler Assured Stopping Power. SNPE Vectan SP 2 delivers the highest muzzle velocity at 1,263 fps; across all powders the maximum-charge window runs from 719 fps to 1,263 fps. Alliant Herco gives the best case fill at 100 %, and 43 of the 62 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (235 MPa), the top charges use 27–90 %, 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 .355 | 124gr | Nosler Assured Stopping Power 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.