22" would be fine, balance or so some speak of, includes much more than a barrel. Unless your shooting off hand competition standing. Balance is a mute issue and just something to talk about, as is the same with the 20 or 22 inch barrel issue. Two inches of a #4 contour barrel weighs nothing, its about the same weigh of steel rings Vs alloy. With the .338 Federal velocity isn't going to change much other than slightly to the plus side for the 22 and swing isn't going to be noticeably different, between 20-22 inches of barrel. With the .338 bore and flutes you may have to go up a contour size or so.