bigun Posted February 9, 2009 Report Share Posted February 9, 2009 you never stop learning http://www.jamescalhoon.com/primers_and_pressure.php Link to comment Share on other sites More sharing options...
Guest martin Posted February 9, 2009 Report Share Posted February 9, 2009 you never stop learning http://www.jamescalhoon.com/primers_and_pressure.php I really wish I could say that I understood all of that,but,I didn't.I am just about to get into home loading,so,I am hoping that it will mean something soon,thanks for putting it up mate.....martin. Link to comment Share on other sites More sharing options...
Andrew Posted February 9, 2009 Report Share Posted February 9, 2009 The technique that Calhoon describes -measuring the head for expansion- has been used here for a very long time. For factory chamberings (meaning those in standard calibers) the method is to measure the head areas on ten new, factory cartridges with a very good micrometer: One that measures to the 10,000th of and inch. Fire these 10 rounds in your rifle then carefully measure the head expansion after firing and average them. Since factory ammo is usually loaded to SAAMI maximum pressures, this will be your maximum expansion allowed for that lot or brand of brass. If you switch components you must start over working up loads; which is one of the primary rules of handloading anyhow.~Andrew Link to comment Share on other sites More sharing options...
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