I've killed a few deer in my 58 years, and knock on wood, I've not lost a single one, but I've had some go at least 100 yds after a good lick through the boiler room, but only had two drop in their tracks.
Now this deal brings to mind an interesting story that I'm gonna share here.
A good buddy of mine hunted on a place in the Verdigris River bottoms for a few years and killed several deer on the place. The land owner nor his son were ever interested in hunting, but the son being a friend of the fella that did hunt decided that he would give deer hunting a try.
The hunter took the son out to one of his good stands and left him to go to another stand that was fairly close. The hunter says right after good light he hears the son fire, and thought that he's probably killed his first deer. A few minutes passed, and he hears another shot...and then a bit later another. Now I'm not sure if there were three or four shots that were fired by the son, but it was one or the other.
My friend, the hunter went to where the landowner's son was and asked him where the deer were. This is where it gets funny. The fella says that he just must be a bad shot or something, cause he'd shot at 3 or 4 (like I said I don't remember which) and they just ran off.
My buddy found all the deer, and the son had the impression that they would drop in their tracks when shot by a high powered rifle.