There is actually no difference in the intrinsic accuracy of a revolver with a 2 inch barrel or a 15 inch barrel. The perceived difference with longer barrels is due to the longer sight radius. A longer barrel can extract more velocity from the ammo, depending upon caliber, bullet, and burning rate of the powder and it moves the report a little further away. The longer barrel will also change the balance of the revolver, reduces muzzle rise and the extra weight will reduce felt recoil. For me, 4 and 6 inch barrels seem to work best for me, but an 8 inch barrel will certainly make my sight misalignment easier to detect.