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Old October 6, 2012, 08:24 AM   #5
Senior Member
Join Date: December 23, 2005
Location: Minnesota
Posts: 2,863
I seat to just under mag length of 2.255 +/-. I don't play around much with OAL in my 223/5.56 AR. Mag length ammo already has a substantial jump in my 5.56 chamber and seating deeper has not shown me much if any improvement. YMMV. Crimping with the Lee Factory Crimp die has shown improved accuracy in my AR so I use it on all my Semi-Auto ammo.
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