If you want to use full choke with steel then it is probably best to get a choke that is steel shot approved. I've been using a cabela's full hevi shot choke that is also rated for steel since 2003 with no problems thus far. I have used 4s in it but I like kent fasteel 2s the best(gonna try 3s when I find some to buy). However I don't like anything bigger than 2s with a full.