The gun can take it. The brass is the weak link.
Years ago when people started loading the 45 Colt hot for the Blackhawks, they did discover that Fed brass was heavier and had good luck with it. Win brass was weaker. Rem brass was the weakest. Case life was shorter than a typical 44 mag case on all the brands. Starline brass for the 45 Colt is heat treated and has a different grain structure just for this reason of people loading it at the higher levels. Agreed on not loading it to 65K psi.
