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Post by metalcaster2 on Apr 1, 2015 18:48:11 GMT -8
Results from many chronogrph tests always have the first shot of a string as the lowest velocity and some times by over 100 fps lower than the other shots in the group. Remaining shots have very low SDs. Shots are fired one minute apart and the barrel allowed to cool between strings. Rifle is fired both with and without a supressor with similar results. Groups always have that first round as the flyer with the other shots in nice small groups. Any ideas for this issue.
Thanks,
Fred
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Post by GLSHOOTER on Apr 2, 2015 5:46:22 GMT -8
First shots on most of my loads have usually been low on a true cold bore shot. Not quite as bad on subsequent groups at the range on the same day. Is this repeated on every group of the day? If so I can't imagine what is at play here. Perhaps Rich will chime in on a theory.
Cold bores historically will vary on their locations especially if the rifle has been cleaned or if you change powder from one to another in shooting groups. That's one reason my M/O's had to know where the cold bore shot went every time. It would take many range days to establish that. We could get close waiting an hour or two but I always wanted the first one of the day to go in the record book as my guys probably were only going to get one shot.
Greg
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