This stems from the mention of these devices in a previous post regarding the potential purchase of a Darne. The potential buyer mentions checking to see if the barrels are regulated through the use of the laser pointing cartridges. Somehow I always imagined a regulation problem would stem from something wrong at the muzzle end like chokes, etc. Does a regulation problem in a shotgun originate at the breach / chamber area? I have never used these laser pointer cartridges nor have I ever owned a shotgun that did not shoot to the same point of aim on a patterning board, so my question is an honest one. All answers appreciated.
