Maybe it's because of better shotshell technology or something, but I don't think you need any choke for American skeet, if you're shooting at least 3/4 oz loads. I don't shoot straights all that often, but I've shot a few with 3/4 oz 8 1/2's or 9's through a 20ga that was choked 000/007. Back in "the day", those guys were probably shooting 1 1/8 oz loads in a 12ga. Can't imagine you'd need any choke with those, for any American skeet target.