As a ground only hunter for deer. I try to set up for a 20 to 25 shot. I prefer to be shooting past the initial 's' curve of my arrow. I think deer can hear my eye balls blink when they are real close. Once I reached between two trees and touched a little 6 pointer, the little bugger almost broke my arm when it jumped, that is too close. If I was to use the guarantee to hit the heart lungs rule on small game, I would have to have the pheasant or rabbit in my one hand and a knife in the other and I would still miss it 50 percent of the time. I shot a pheasant that was way over my 58 yard point, the shot went from looking good to two feet off and then right on, when the pheasant decided to catch my arrow. This year I took a long shot at a running rabbit. It stopped when I released, I would have missed it by a wide margin, a deflection almost gave me a head shot. We can do all kinds of things to make it a guaranteed deal, but this is traditional archery, the human element and a host of variables throw out most of the guarantees.