Re: Huge Muzzle Velocity spreads
Were you doing your testing on a sunny day? Assuming that your chronograph is functioning properly, aligned, stable, and at least 15ft from the barrel, your first set of results look like variation caused by lighting. Shadowing, and or reflections off the bullet can easily cause the kind of variations in your first set of data. Depending on your particular rifle, initial shots from a cold or clean bore can also show variation but in my experience to a much lesser extent. Either shooting in a shaded area, or on an overcast day will generally improve readingis. Results can also be improved by constructing shades that stop stay light or shadows from interfering with the optical readers or causing refections off the bullet. A while back I got a Magnetspeed which eliminated the lighting issue, produced accurate results, and made set-up a whole lot easier. iMHO.
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