My M586 has been flame cut since 1984 after firing a lot of 125 grain .357's. Over the years I learned that the 125's were the culprit and now I only shoot 158 grain .357 mag's. The flame cutting has pretty much stopped and has not gotten any deeper with the use of 158 grain bullets. Now I barely even notice it & other than cosmetics, it's a non -issue.

Chief38