I might help a little. Never had a 7 TCU, but did have a 6 TCU for many years. I learned that lighter bullets at as fast as I could send them, put behind the shoulders, and less than 150 yds. did the best. Translated to the 7 TCU would probably mean 120s with the same placement and distance.
When shoulder blades were hit penetration suffered greatly.
As long as I kept the game small-does, groundhogs, foxes it was OK, but not earth shattering.