I shot my Buck with the Reaper Broadhead it did the job got my deer which bled out in less than 70 yards no lungs hit but I think the liver or a vital artery was hit because the blood trail was clear all the way to were he laid down. When I found my arrow the blades seemed to not have opened but the exit wound looked like they did open,hard to read for a rookie hunter. Thanks for all your input on my question. Good Hunting!