The question that begs to be asked is, "Would you take a going away follow-up shot if your broadside shot hit too far back and your gut shot deer was headed for the next area code
Ah, but that's a different question. Your first post asked about shooting a deer up the poop chute, now your talking about a follow up shot. The answer to that is of course. A good 6mm bullet (tsx) might make it further upstream then a standard bullet, but any bullet has the chance of taking out a leg, severing the spine or cutting a major artery AS A BACK UP ONLY SHOT to slow it down. Under no circumstances should anybody make a Texas Heart Shot and say their deer is going to go down while it wanders off through your heavily wooded area. It's very simple, if you don't have a good shot, don't take it. I doubt anyone on here is starving, and patiance is a pleasure that too many have forgotten about.