Just looking for some help on a reamer purchase. I'm looking at a 450 Rigby reamer on the PTG website and they list two one is 450 Rigby rimless and the other is a 450 Rigby CIP. I called ptg but couldn't get a straight answer and was told someone would call back. From the quick googling I have done I understand that CIP is the European version of SAAMI. Hoping someone might be able to help me with the difference and which one I would be after? I'm just looking for a standard reamer for factory ammo nothing unusual or fancy. Thanks