Have you had trouble getting Hevi-metal shells to feed in a semi-auto?
My Beneilli SBE II eats just about anything, until now. I'm using 3" BB in a goose field, and the first two flights gave me a surprise. First shot, boom then action fails to cycle. When I put Kent 3" in...boom, boom, boom.

Even when loading, the Hevi shells don't go in easy.