I knew the owner of a shot gun range who was a championship skeet shooter. There is a wall in the club house literally filled with awards for winning. She always said why clean the bores. They are cleaned each time you shoot. She shot Remington 1100's and a Krieghoff. I don't think she was kidding and she probably shot a million rounds.
I am always concerned that the residue will hold moisture and cause a problem. I have no idea where I got that idea. I spend too much time cleaning my guns but I rarely shoot the same gun twice in a row or even twice in a month so it does sit in the safe for long periods.
