The easiest way to test your rifle is to use a fired shell in one barrel and put a live round in the other, you can alternate which barrel has the fired case, after firing with ejectors it will kick out the barrel or barrels that fired. My merkel doubled and I sent it back to the factory a German gunsmith asked if I knew how to shoot a double and I told him one barrel at a time, he insinuated I strummed the rear trigger. They said it was fixed but it had a delayed double the next time out so back it went. Cal from alaska who recently passed is a sxs fanatic always told me left barrel first
