Explain........This Cartridge needs a 35-40 Degree shoulder due to poor quality Brass from Hornady.
Curious why you are necking up the 6.5 PRC instead of necking down the 300 RCM, just curious? That said I have a reamer for the 7mm/300 RCM but have not chambered anything yet but plan to sometime yet this winter. Basic difference between the two is that the RCM is about 1/10" longer than the PRC, slightly more case capacity.