Just wanted to see if there was an update on this?
Last year, I was able to kill a large carb claw 7 point with a slight limp in late December muzzleloading. When cleaning the deer out, I cut my hand on a broadhead that was lodged in the lung area. It was a mechanical and about 5 inches of carbon arrow. It apparently was a frontal shot and only got the one lung without any major arteries being hit. The deer was originally shot with the arrow in early October, as I met the hunter who was tracking the wounded buck.
Not every deer that runs out of sight dies after being hit. I track like they do, but they are tough animals and can make it through. Best of luck.