GAP developed the 6.5 4S (6.5 SAUM) and has now standardized on the .120 freebore reamer. They sell Hornady brass with the 6.5 Gap 4S headstamp.
6.5 PRC is a Hornady deal, not a GAP development. I see the PRC being popular with the PRS and other shooting sports. Especially in a RPR. Wonder how many rifles Ruger will have out a year from now?
