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So I reloaded some 300 BO for some tests using 230 gr berger and a 185 berger with 7-9 grns of win 296 for the 230 and 14-15 grns of the same. Shot it thru a BCM 9" upper with an aero m4 lower. After shooting 5 rounds of each I noticed the brass was flattened on one side. Anyone have an idea as to what may cause this? All this cycled through the gun just fine though no bolt lock on the 185's.