I' m satisfied with the accuracy of my Belgian Centaure revolver. I still think, however, that it can slightly be improved with a wider trigger, and a faster hammer, using a stiffer mainspring and/or a lightened hammer and minor changes in the load.
The group was achieved one hand held, standing, from 25 meters, 454 ball over 22 grains of FFFg Swiss powder and no fillers or wads, with ball sitting on the powder and grease over the chambers.
The thin trigger, typical in Colts, makes accuracy more difficult, as it multiplies finger mistakes.
Pd: Patched impacts by unknown shooter probably using a 9mm parabellum pistol...I employed a used target that I found in the range and there was a 9mm match the morning before. Not a very skilled shooter, by the way.