RE: Chronograph ?
i have the very same cronograph and it did the same thing to me. i have found that dusk is in deed the worst time to try to use it. the best time i have found is mid day with it in a slightly shaded area or cloudy. as for the velocity, i have found that most of your reloading manuals to be different from each other. the book i have found that seems to be real close is the serria 5th eddition. and dont forget to keep a fresh battery (9v) for your cronograph printer. if it gets a little low, it wont print being a laser printer. also keep in mind, trickle your powder to fine tone your loads. you will find it to be more consistant.