Probably half the deer I've shot have been taken with a 12 ga. brenneke slug. They do penetrate.
IMO any blood trail is simply a luck thing. Hides that stretch and fat that will clog any hole you can make.
Last 2 deer with a Brenneke were a decent buck that made it probably 200 yards leaking heavy all the way. And a 100 lb doe that went 50 yards without losing a drop until she laid down
Both good hits tight behind the shoulder.
^^^^^^^^^^^ Well said, I agree ^^^^^^^^^^^^