04-18-2022, 10:27 PM
As VASCAR noted, Competition Shooting Sports (CSS) which was run by Arne Brennan, the co-developer of the Grendel sold a variation with a tighter neck. Arne shot in competition and preferred the smaller neck for longer brass life. That was over 10 years ago, though. At the time there was some bru-ha-ha over whether it should use the Grendel name and was, for a while may have been called the 6.5CSS. I think that Arne eventually started using the name "6.5mm PPCX". The "X", as I seem to recall stood for Grendel-style brass, which has the shoulder pushed forward when compared to regular PPC brass (eXtended capacity, in other words). It is possible that someone has a similar reamer to rent. There was also a 6mm PPCX, if that is of any interest. Gunsmiths who do a lot with Benchrest rifles may have one of those reamers, FWIW.