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Originally Posted by John Dallas
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John that is the exact article I was recalling. When I look at Table II I read this as an experiment where various primers were substituted within the same reload that produced pressures that varied as much as 3,320 LUP (wish it would have been stated in PSI). Roster goes on to state that this is "nothing to disregard to say the least". You refer to this as "slightly more in pressures". To me this seems significant. I do not profess to be knowledgeable in ballistics so please educate me, what am I missing ? His writings are the primary reason I never substitute primers or any other components that are not proven.