60 gr Partitions worked awesome on a fat axis doe this year. Made a 25 yard death run and crashed. Bullet did exit and the entrance and exit holes were big enough to stick a water hose in. No experience with the 64 gr BSB.
Shot two doe antelope with the 64 BSB. Both were shoulder shots and neither went anywhere but down. Really impressed. Both exited, but damage externally was minimal. This was a .223 and I was impressed.