Does such a thing exist? I am guessing the profile of the 400 Corbon would do nicely (I have not seen that one but imagine it like a larger 357 SIG) but how tricky would the chambering be? Would a smith be willing to run a 400 Corbon reamer to 38-40 depth? If that is workable, I would see no problem neck sizing brass on a 400 Corbon die if it is adjusted right. If full-length sizing is needed, the rest could be done in a 45 Colt die. Would this offer a considerable improvement?