CCI Large Rifle Bench Rest Primers #BR2. In Benchrest competition, there’s no such thing as a group that’s “too small.” Everything has to be tuned to the highest degree to produce match-winning results. That’s why you should use CCI Benchrest primers. Only the most experienced skilled personnel put the priming mix in the cups, so you get the same flame, shot after shot. Benchrest Primers also use specially selected cups and anvils for added consistency. An independent researcher identified the use of CCI Benchrest primers as one of two factors that were the most significant contributors to tiny groups.