had a guy in camp a couple years ago that watched a bull for 20 minutes at 70 yards that was racked on one side and a spike on the other with an eye guard. he let him walk. heard through the grape vine that a 6x1 was killed the next morning in the same draw. he just wasn't sure & erred on the side of caution. when he heard the news and consulted the reg's again, the dude was physically ill, would have been his first. hard to tell some times, but you really have to know the reg's and pay attention to what you are looking at. I know I've let a few walk because I just cant measure an 1/8th of an inch through a scope at any yardage.