hi, i have a batavia leader with Damascus barrels the gun has been getting loose (side to side movement) on the face while cleaning the gun today i noticed a screw on the back side of the hook, not sure what its for but i backed it out about a 1/4 turn and the looseness is cured. not sure this is an adjustment screw or not?? question 2. what do the initials ADH stamped on the bottom of each barrel refer to? question 3.do any of you gentlemen use your Damascus guns on game? partridge, rabbit ect? maybe even over decoys after ducks? thanks