I have a load worked up with federal brass that groups wonderful and it groups the same with lc brass . but im shooting max loads already and the lc brass has decreased case capacity . One gun smith told me aslong as im not splitting cases and blowing out primers im fine . the only affect it has on my AR 15 is they make me have to clean it every 100 rounds. I have about 6 pounds of lake city brass . how bad am im messing up shooting these loads in an AR?