I am in the process of shooting my first postal match - Little Bore.  I'm having fun in spite of not doing very well.   I'm thinking of (hurriedly) signing up for the mid bore, and a couple of others, but I have sort of a problem.  The only mid-bore gun I have is a 338 WM, and the only mold I have for that is the Lee 220.  My version casts undersized, and I've been experimenting with paper patching them.   My question: are paper patched bullets allowed?  If they're technically allowed, are they frowned upon?  Should I just maybe shim the mold or get another?