James, I noticed you have a birthday coming up Thursday, so HAPPY BIRTHDAY! Now I would like to know more about your chronograph, like how much light it requires and how much shade effects it. I have a prochrono plus and it's very fussy about the degree of light that it will work with. It's usually got to be in partial shade to be dependable. This is why I worry more about my group size than velocity. I'm also more into punching paper than hunting, not by choice but because of some injuries I've been slow to recover from. But maybe I'll get to go bear hunting in a year or so! THANKS Glenn;