Hey grit ,
Just loaded some yesterday ! I'm using RCBS dies, and they came with 2 seater plugs. One is flat which loads every 500 bullet I use, other than the ftx. The other plug is for a more pointed bullet. I did get a light ring around the bullets where the plug made contact, but I don't think it will be an issue.
300 gr FTX over 41.0 gr Lil Gun Supposedly 1700+ fps (almost starting load)
350 gr Berry's over Titegroup
350 gr XTP over H4227
400 gr Sierra over H4227