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Old January 22, 2013, 08:42 AM   #3
243winxb
Senior Member
 
Join Date: July 26, 2011
Posts: 970
If all brass is doing it, primer undersize problem? 24gr is maximun for autos. Have some primer pockets been swaged or reamed to remove the crimped in primer? Maybe over done? Barrel length has a large effect on velocity. Sierra is getting 2600 fps with a colt 20" bbl with 24.1gr (69gr bullet) Subtract about 35fps per inch of barrel. http://accurateshooter.net/Downloads/sierra223ar.pdf
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