Apologies for the slow response. I personally wouldn’t invest in a 7mmTCU barrel unless I just wanted something to do. I’d definitely buy a .300BK Contender barrel and may do so one day. We haven’t touched our 7TCU much at all since we got the .300 BLK. There is nothing I’ve loaded for the 7mmTCU that compares to the 110 Barnes performance wise on deer.
I need to look up the data, we did use a 120BT and another 120 of some ilk. All of our shots were kept under 100 yards with these on game.