Hey Mike, not sure I've seen anyone campaigning a 30 Dasher, although there's no reason not too. I've seen quite a few improved 30's on the BR case though. Most use the existing shoulder angle, just blown forward .075" or .100". As far as the neck length is concerned, I don't think you'll have a problem. Al Nyhus and Stan Ware came up with a case based on BR brass that leaves only .100" of neck. From what I can gather, there are no problems with seating into such a short neck. Maybe Al will chime in to give a little more info.
Hal
