Treestand or on the ground? I’ll assume treestand with your skyline comment, but there’s places on the ridge I hunt where I’m skylined with feet on the ground. I’d shoot for a third of the way down on the deer, just in front of, or just behind front shoulder. Either of those should wreck enough important stuff with a 140 BT.
Doc, 20' up in a tamarack tree, but I do think that behind the leading shoulder shot would get liver and gut and a mess from a quartering to angle. I took that shot once in fading light with my crossbow on what I thought was a broadside short coupled fawn of the year, but it was a mature doe at an angle toward me. Toughest tracking job that I'd ever had for hundreds of yards.
Stick, Agreed that a BT is a bit soft for a shoulder, but losing a trophy buck to a TSX was all I needed to experience to switch to faster opening BT's.