The 90AB is not tough enough for the 240Wby, not even close. I shot two 8pts and a doe with them and they were like varmint bullets at that speed, no exits and shallow penetration. On one buck with a broadside rib impact the bullet did nothing to the offside ribs, just mush and bullet frags inside.
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It's possible you got a hold of the un-bonded Accubond. John Barsness has posted several times about a Nosler employee who thought he could speed up production and these resulted in no bonding. The Accubond with out the bonding would be as or more violent than a BT.