cgrivois Posted January 3, 2012 Share Posted January 3, 2012 How much of a difference can mixed heads stamps make with velocity? I’m getting as much as 50fps difference between highest and lowest velocity out of a 10 shot string. I dial in my powder by throwing 10 charges then get the average. After that I run 20-30 rounds through the press, 550B, and then set up charge for next load to test. I’ve also seen my OAL vary by as much as +- .003, which could be mixed head stamp related to I suppose, so Im guessing I could be getting some variance there as well. Chrono is a Pro Chrono and brand new. Should I take the time and make sure all head stamps are the same when testing loads? Quote Link to comment Share on other sites More sharing options...
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