I have been using cci 450, cci br4, federal 205m, 1990 vintage rws srp, new issue rws srp, 1980's vintage rem 7 1/2 (2 anvil) and newer rem 7 1/2 (3 anvil) primers in 6mm BR, .17 rem, 6x47 lap, 222, 223 etc.
Easy chambering and extraction of cases, satisfactory visual inspection of fired primers, continuing firm primer seating and removal etc all indicate pressures are not excessive in these calibres.
However, I no longer use the new 3 anvil rem 7 1/2 's due to the occasional pin hole leaks on the primer edges.
cheers
goodi