I agree with Hanco on he bullet choice of 140 gr NBT, but I moved from IMR4350 to H4350 for temp stability and then moved to IMR4166 for temp stability and no Copper fouling.

64 gr IMR 4350 is about 60kpsi.
I run 75 kpsi in 7mmRM and never re use brass.

There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps