I'm a little baffled on the subject, specifically in regards to the .284 BT hunting bullets. From the advice and experience of several here, I understand the 7mm 150 BT's to be pretty darn tough, but the 140's not so much. I also understand the 120 BT to be very tough. I would have thought there would be a cutoff point of, say, anything over an "x" grain bullet is tougher than the one's under this point. How does one know which BT's in the same caliber are tougher than another of the same caliber?
