I cannot believe the number of random, useless and downright stupid responses. If you have a drill press, table top or stand alone, just put the 30BR case in with the rim down right at the end of the chuck. Then take a fine tooth file and spin them suckers up. Hold the file against the rim of the 30Br case and in about 30-45 seconds you have reduced the rim diameter to fit the ppc bolt face. Just check now and then and pretty soon you will know about how long to hold the file against the rim. You could of course use the bolt to check as to when you get to the diameter that works. It is actually dirt simple. I have done bunches of them and sometimes you have to chamfer the upper edge of the rim to get them to eject properly. But all done with a drill press and a fine tooth flat bastard file. Simple simple.
Donald