Unless the bore was mechanically wrecked in some manner as a result of the "boring", you should be able to adjust the load to the barrel. Shotguns are no different than rifles, you can't expect to shove anything you want in the back side and have it work properly on the front side. Change the powder, change the payload weight, change the wad, ect. The amount of squeeze applied by a common constriction choke often means less to degree of pattern quality than a properly built load for the gun.
"Carry the battle to them. Don't let them bring it to you. Put them on the defensive and don't ever apologize for anything."
Harry S. Truman