I have an ar with 5.56 chamber that has over 1000 rounds through it. Rifle runs like a sewing machine and has never failed. mostly handloads using lake city brass and 55 gr with near max load of varget. Seems like brass does not grow very much from multiple shots. Can get more than 4 loadings before it's getting close to max length when trimmed to .007 under max length. Is this an indication of headspace on the tight side ?
