I used to hunt fox with a 3 in A 5 years ago. I loved it for fox and it deadly on them. What I could not understand is that I could shoot at clay birds all day and not hit one. Rabbits and phesants were safe if they were 30 ft. away or more. I could hammer fox with it, but nothing esle.
I would recomand you not shoot steel shot throught it unless it is a cylinder bore. Those old guns can split barrels with tight chokes.