I agree with the others as far as always being ready, but I did do something similar to you the other day. I called it the LD-50. Some may remember from biology classes that LD-50 is a dose of chemical that would kill 50% of test subjects. So, because I'm a scientific dork, I wanted to know the distance at which I could reliably get 50% of my shots in the kill zone(15" round). Plus, if you haven't done any long distance shooting, it's really fun. Anyway, my LD-50 was right around 55 yards. Interestingly enough, I have only slightly better accuracy from 35 yards and out.