Yes Peg has a point about head shots , but I have never seen a head shot deer run off ever.I have though seen 2 neck shot deer run off , 1st one was a fallow buck which I dropped on the spot only for it to run off as we approached it, luckily it was dispatched a few fields further on.I also neck shot a red stag which did the same thing , but unfortunately we lost it!! I have never seen a roe get away with a head or neck shot though!!!