How many firings did the brass have on it when it was extracting fine? I can get about two firings on full pressure loads without any clicks at the top of extraction. After the case expands (near the base) a smidge after two or so firings I get clicks at the top of extraction from then on. I have a feeling it's due to poor primary extraction and some bolt timing work is needed so that everything is working in unison to extract the case.