You may be splitting hairs. If you're not getting an exit wound your bullet is expending all of its energy on the animal which results in quick kills. You don't need an exit wound if you don't need to track .
I have the same problem with my .257 Weatherby when I take a deer inside 200 yards. The velocity is so great with this round that the bullets (BT and Accubond) come apart and destroy everything internal. Beyond 200 yards the velocity is low enough that the bullet performs as advertised and I get a pass through. That may be an issue with a .270 if you are shooting less than 100 yards.
If you want a pass through, take look at a premium bonded bullet like a Barnes TSX in 130 grain.
CK
I have the same problem with my .257 Weatherby when I take a deer inside 200 yards. The velocity is so great with this round that the bullets (BT and Accubond) come apart and destroy everything internal. Beyond 200 yards the velocity is low enough that the bullet performs as advertised and I get a pass through. That may be an issue with a .270 if you are shooting less than 100 yards.
If you want a pass through, take look at a premium bonded bullet like a Barnes TSX in 130 grain.
CK