The 65 grain Sierra Game Kings have dramatic expansion and fragmentation from the times I have shot animals with it. I never got a pass through on a deer with that bullet, and never a pass through on a pig. The deer went a short distance, but did go down. The pig ran a little further. The 70 AB will be a much tougher bullet. Expansion should be there, but the penetration will be much better. The 64 grain bonded bullet I used this past season worked great. .224" hole going in and about a dime size exit hole. I was really impressed with that bullet and the performance from a 223 Rem bolt gun. The 70 AB should perform very similar- decent expansion and deep penetration. You won't see the dramatic expansion with the 70 AB as the 65 grain SGK, especially on soft targets like a coyote.