RE: Best choke for a rem 870 express magnummagnum?
I use a standard Undertaker in my 870 express w/23" barrel. I have patterned it with at least five different loads (#5 and #6). It patterns a little better than the stock turkey extra full choke, but not enough to make me recommend it. For what it's worth, in my gun, it does best with Winchester Supreme 1 3/4 oz. #5.