Load Specifications
Load data in caliber 9 x 21 with .356 | 125gr | SNS Coated Bullets RN 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 Maxam CSB 2.
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% | 30,385 psi | 89% | 1093 fps | 96.9% |
| Accurate No. 5*² | <<locked>> | 68% | 28,471 psi | 84% | 1125 fps | 87.8% |
| Accurate Solo 1000 | <<locked>> | 80% | 28,079 psi | 82% | 1017 fps | 100% |
| Accurate Solo 1250 | <<locked>> | 88% | 28,210 psi | 83% | 1070 fps | 100% |
| ADI AP 70N² | <<locked>> | 76% | 30,414 psi | 89% | 1112 fps | 100% |
| ADI APS 350² | <<locked>> | 76% | 30,182 psi | 89% | 942 fps | 100% |
| ADI APS 450 | <<locked>> | 80% | 30,385 psi | 89% | 978 fps | 100% |
| ADI AS 30 | <<locked>> | 84% | 30,095 psi | 88% | 1017 fps | 100% |
| ADI AS 50N | <<locked>> | 80% | 29,936 psi | 88% | 1053 fps | 100% |
| Alliant BE-86 | <<locked>> | 88% | 28,558 psi | 84% | 1073 fps | 100% |
| Alliant BULLSEYE | <<locked>> | 80% | 29,791 psi | 87% | 1135 fps | 99.3% |
| Alliant Green Dot | <<locked>> | 84% | 29,457 psi | 86% | 1053 fps | 100% |
| Alliant Hercoᴾ | <<locked>> | 100% | 25,396 psi | 75% | 1073 fps | 97.6% |
| Alliant RED DOT | <<locked>> | 84% | 28,790 psi | 84% | 1020 fps | 100% |
| Alliant Sport Pistol² | <<locked>> | 72% | 27,659 psi | 81% | 1106 fps | 98.3% |
| Alliant UNIQUE | <<locked>> | 92% | 29,602 psi | 87% | 1142 fps | 98.9% |
| Baschieri & Pellagri 100 | <<locked>> | 84% | 29,370 psi | 86% | 1040 fps | 100% |
| Baschieri & Pellagri 102 Pistolᴾ | <<locked>> | 100% | 25,483 psi | 75% | 1020 fps | 100% |
| Baschieri & Pellagri 103 Pistol | <<locked>> | 80% | 28,152 psi | 83% | 1056 fps | 100% |
| Hodgdon CFE Pistol | <<locked>> | 84% | 27,804 psi | 82% | 1076 fps | 100% |
| Hodgdon Clays² | <<locked>> | 76% | 30,516 psi | 90% | 955 fps | 100% |
| Hodgdon HP38² | <<locked>> | 64% | 29,747 psi | 87% | 1076 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 76% | 30,081 psi | 88% | 1142 fps | 91.1% |
| Hodgdon Longshot*² | <<locked>> | 72% | 29,631 psi | 87% | 1138 fps | 93% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 11,618 psi | 34% | 728 fps | 99.9% |
| Hodgdon Universal | <<locked>> | 84% | 30,414 psi | 89% | 1112 fps | 100% |
| Lovex D036*² | <<locked>> | 68% | 28,413 psi | 83% | 1125 fps | 87.7% |
| Lovex S011² | <<locked>> | 72% | 29,718 psi | 87% | 1060 fps | 100% |
| Lovex S020 | <<locked>> | 84% | 29,631 psi | 87% | 1109 fps | 99.7% |
| Maxam CSB 1 | <<locked>> | 96% | 30,371 psi | 89% | 1093 fps | 100% |
| Maxam CSB 2 | <<locked>> | 92% | 28,558 psi | 84% | 1099 fps | 100% |
| Maxam CSB 3 | <<locked>> | 88% | 29,486 psi | 87% | 1066 fps | 100% |
| Maxam CSB 4 | <<locked>> | 84% | 30,269 psi | 89% | 1060 fps | 100% |
| Maxam CSB 5 | <<locked>> | 80% | 30,313 psi | 89% | 1017 fps | 100% |
| Ramshot Silhouette² | <<locked>> | 76% | 30,168 psi | 89% | 1138 fps | 97.5% |
| Ramshot True Blue*² | <<locked>> | 72% | 30,255 psi | 89% | 1142 fps | 93.3% |
| Ramshot Zip² | <<locked>> | 64% | 29,936 psi | 88% | 1083 fps | 100% |
| ReloadSwiss RS 12 | <<locked>> | 80% | 29,196 psi | 86% | 1089 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 11,052 psi | 32% | 728 fps | 97.9% |
| ReloadSwiss RS 20 | <<locked>> | 96% | 29,269 psi | 86% | 1152 fps | 99.8% |
| Rottweil P 801² | <<locked>> | 72% | 28,964 psi | 85% | 1053 fps | 100% |
| Rottweil P 806*ᴾ | <<locked>> | 100% | 23,467 psi | 69% | 1155 fps | 88.2% |
| Shooters World Auto Pistol*² | <<locked>> | 68% | 28,413 psi | 83% | 1125 fps | 87.7% |
| SNPE Vectan A0 | <<locked>> | 92% | 28,674 psi | 84% | 1083 fps | 98.3% |
| SNPE Vectan A1 | <<locked>> | 84% | 30,313 psi | 89% | 1079 fps | 100% |
| SNPE Vectan BA 9 | <<locked>> | 84% | 29,153 psi | 86% | 1073 fps | 99.9% |
| SNPE Vectan BA10² | <<locked>> | 72% | 28,834 psi | 85% | 961 fps | 100% |
| SNPE Vectan BA7 1/2*ᴾ | <<locked>> | 100% | 29,878 psi | 88% | 1122 fps | 92.2% |
| SNPE Vectan BA9 1/2 | <<locked>> | 88% | 30,777 psi | 90% | 1109 fps | 100% |
| SNPE Vectan SP 2* | <<locked>> | 92% | 30,313 psi | 89% | 1217 fps | 88.3% |
| Somchem MP200 | <<locked>> | 84% | 29,414 psi | 86% | 1122 fps | 97.9% |
| Somchem MS200 | <<locked>> | 88% | 29,849 psi | 88% | 1112 fps | 99.3% |
| Vihtavuori 3N37* | <<locked>> | 92% | 27,659 psi | 81% | 1122 fps | 92.5% |
| Vihtavuori N310² | <<locked>> | 64% | 29,718 psi | 87% | 981 fps | 100% |
| Vihtavuori N320 | <<locked>> | 80% | 28,384 psi | 83% | 1050 fps | 100% |
| Vihtavuori N32C Tin Starᴾ | <<locked>> | 100% | 20,436 psi | 60% | 889 fps | 100% |
| Vihtavuori N330 | <<locked>> | 84% | 28,906 psi | 85% | 1109 fps | 100% |
| Vihtavuori N340 | <<locked>> | 88% | 28,529 psi | 84% | 1099 fps | 98.6% |
| Vihtavuori N350*ᴾ | <<locked>> | 100% | 28,964 psi | 85% | 1138 fps | 93.5% |
| Winchester 231² | <<locked>> | 72% | 29,936 psi | 88% | 1083 fps | 100% |
| Winchester 572*² | <<locked>> | 64% | 29,544 psi | 87% | 1142 fps | 92.2% |
| Winchester AutoComp | <<locked>> | 92% | 30,226 psi | 89% | 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>> | 60% | 15,302 psi | 45% | 837 fps | 86.9% |
| Accurate No. 5*² | <<locked>> | 64% | 25,309 psi | 74% | 1076 fps | 85.7% |
| Accurate Solo 1000² | <<locked>> | 60% | 17,448 psi | 51% | 853 fps | 100% |
| Accurate Solo 1250² | <<locked>> | 60% | 13,895 psi | 41% | 814 fps | 95.4% |
| ADI AP 70N² | <<locked>> | 60% | 20,233 psi | 59% | 958 fps | 99.5% |
| ADI APS 350² | <<locked>> | 60% | 20,030 psi | 59% | 814 fps | 100% |
| ADI APS 450² | <<locked>> | 60% | 18,608 psi | 55% | 823 fps | 100% |
| ADI AS 30² | <<locked>> | 60% | 17,637 psi | 52% | 837 fps | 100% |
| ADI AS 50N² | <<locked>> | 60% | 18,057 psi | 53% | 876 fps | 100% |
| Alliant BE-86² | <<locked>> | 60% | 14,475 psi | 42% | 837 fps | 98.2% |
| Alliant BULLSEYE*² | <<locked>> | 60% | 17,637 psi | 52% | 919 fps | 93.6% |
| Alliant Green Dot² | <<locked>> | 60% | 16,897 psi | 50% | 856 fps | 100% |
| Alliant Herco*² | <<locked>> | 64% | 12,140 psi | 36% | 784 fps | 86.4% |
| Alliant RED DOT² | <<locked>> | 60% | 16,694 psi | 49% | 837 fps | 100% |
| Alliant Sport Pistol*² | <<locked>> | 60% | 20,044 psi | 59% | 971 fps | 94.6% |
| Alliant UNIQUE*² | 3.1 gr | 60% | 13,837 psi | 41% | 833 fps | 88.7% |
| Baschieri & Pellagri 100² | <<locked>> | 60% | 15,882 psi | 47% | 833 fps | 99.5% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 10,399 psi | 31% | 728 fps | 97.9% |
| Baschieri & Pellagri 103 Pistol² | <<locked>> | 60% | 16,099 psi | 47% | 873 fps | 99.9% |
| Hodgdon CFE Pistol² | <<locked>> | 60% | 15,708 psi | 46% | 863 fps | 96.5% |
| Hodgdon Clays² | <<locked>> | 60% | 20,189 psi | 59% | 827 fps | 100% |
| Hodgdon HP38² | <<locked>> | 60% | 27,195 psi | 80% | 1043 fps | 100% |
| Hodgdon HS-6*² | <<locked>> | 68% | 23,917 psi | 70% | 1047 fps | 87.3% |
| Hodgdon Longshot*² | <<locked>> | 60% | 20,088 psi | 59% | 978 fps | 86.6% |
| Hodgdon TrailBoss² | <<locked>> | 60% | 6,498 psi | 19% | 538 fps | 95.2% |
| Hodgdon Universal² | <<locked>> | 60% | 16,607 psi | 49% | 883 fps | 98.1% |
| Lovex D036*² | <<locked>> | 64% | 25,266 psi | 74% | 1073 fps | 85.6% |
| Lovex S011² | <<locked>> | 60% | 20,885 psi | 61% | 935 fps | 99.8% |
| Lovex S020*² | <<locked>> | 60% | 15,708 psi | 46% | 873 fps | 93.6% |
| Maxam CSB 1² | <<locked>> | 60% | 13,474 psi | 40% | 801 fps | 95.1% |
| Maxam CSB 2² | 3 gr | 60% | 13,518 psi | 40% | 843 fps | 99.3% |
| Maxam CSB 3² | <<locked>> | 60% | 15,360 psi | 45% | 837 fps | 99.3% |
| Maxam CSB 4² | <<locked>> | 60% | 17,129 psi | 50% | 866 fps | 100% |
| Maxam CSB 5² | <<locked>> | 60% | 18,391 psi | 54% | 856 fps | 100% |
| Ramshot Silhouette*² | <<locked>> | 60% | 18,449 psi | 54% | 942 fps | 90.9% |
| Ramshot True Blue*² | <<locked>> | 60% | 21,379 psi | 63% | 997 fps | 87.7% |
| Ramshot Zip² | <<locked>> | 60% | 26,179 psi | 77% | 1033 fps | 100% |
| ReloadSwiss RS 12² | <<locked>> | 60% | 17,912 psi | 53% | 925 fps | 100% |
| ReloadSwiss RS 14*² | <<locked>> | 60% | 6,527 psi | 19% | 545 fps | 90.5% |
| ReloadSwiss RS 20*² | 3.3 gr | 60% | 12,430 psi | 36% | 817 fps | 89.1% |
| Rottweil P 801² | <<locked>> | 60% | 20,784 psi | 61% | 942 fps | 100% |
| Rottweil P 806* | <<locked>> | 96% | 21,161 psi | 62% | 1109 fps | 86.2% |
| Shooters World Auto Pistol*² | <<locked>> | 64% | 25,266 psi | 74% | 1073 fps | 85.6% |
| SNPE Vectan A0*² | <<locked>> | 60% | 13,329 psi | 39% | 787 fps | 87.5% |
| SNPE Vectan A1² | <<locked>> | 60% | 17,042 psi | 50% | 873 fps | 98.8% |
| SNPE Vectan BA 9² | <<locked>> | 60% | 16,273 psi | 48% | 856 fps | 95.5% |
| SNPE Vectan BA10² | <<locked>> | 60% | 20,900 psi | 61% | 856 fps | 100% |
| SNPE Vectan BA7 1/2* | <<locked>> | 84% | 20,392 psi | 60% | 968 fps | 85.8% |
| SNPE Vectan BA9 1/2² | <<locked>> | 60% | 16,157 psi | 47% | 866 fps | 97% |
| SNPE Vectan SP 2* | <<locked>> | 88% | 28,079 psi | 82% | 1184 fps | 87% |
| Somchem MP200*² | <<locked>> | 60% | 16,157 psi | 47% | 879 fps | 89.7% |
| Somchem MS200*² | <<locked>> | 60% | 15,142 psi | 44% | 846 fps | 91.5% |
| Vihtavuori 3N37*² | <<locked>> | 76% | 18,333 psi | 54% | 958 fps | 85.5% |
| Vihtavuori N310² | <<locked>> | 60% | 26,542 psi | 78% | 945 fps | 100% |
| Vihtavuori N320² | <<locked>> | 60% | 16,549 psi | 49% | 869 fps | 100% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 9,239 psi | 27% | 659 fps | 100% |
| Vihtavuori N330² | <<locked>> | 60% | 15,026 psi | 44% | 876 fps | 98% |
| Vihtavuori N340*² | <<locked>> | 60% | 14,054 psi | 41% | 830 fps | 89.4% |
| Vihtavuori N350* | <<locked>> | 80% | 18,217 psi | 53% | 951 fps | 85.7% |
| Winchester 231² | <<locked>> | 60% | 21,727 psi | 64% | 965 fps | 99.9% |
| Winchester 572*² | <<locked>> | 60% | 25,164 psi | 74% | 1073 fps | 89.6% |
| Winchester AutoComp *² | <<locked>> | 60% | 13,648 psi | 40% | 814 fps | 94% |
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 33 powders for 9 x 21 loaded with the .356 | 125gr | SNS Coated Bullets RN. ReloadSwiss RS 20 delivers the highest muzzle velocity at 1,152 fps; across all powders the maximum-charge window runs from 728 fps to 1,152 fps. Alliant Herco gives the best case fill at 100 %, and 33 of the 33 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (235 MPa), the top charges use 32–90 %, 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, Maxam CSB 2 rank at the top here: for 9 x 21 with the .356 | 125gr | SNS Coated Bullets RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, SNPE Vectan BA7 1/2, Vihtavuori 3N37, Vihtavuori N350 burn incompletely and react more sensitively to barrel length and temperature. Accurate No. 2, Accurate Solo 1250, ADI AS 30 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.