I show early signs of pressure with nosler brass with my 6.5 284 norma but not with my 2 6.5 prcs using hornady brass I've worked up too 63.5 grs of n165 with a cci 250 mag primer toped with a 123 gr absolute hammer at 3452 fps with no pressure issues the 6.5 prc has been one of the easist cartridges I've loaded for but I'm not at saami specs . 145 freebore unless your loosing primer pockets ejector marks etc bolt lift could be a sizing issue allways be careful all else fails have a competent gunsmith check your chambering