I've never used 220's, but, as I posted on a recent thread, went to a 20 or 22 pound Wolfe spring to cure extraction problems in my Glock 20 with hot 180 grain xtp/2400 loads. It worked like a charm. Also replaced the plastic guide rod with a heavy steel one. This set up runs all the 200 grain loads on down with no problem and, in fact, it runs .40 S&W 165's and 180's without a problem.
