So far as primers go, in some cases there can be a large distinction in precision potential. Practically all of the rifles I have experimented with the CCI BR2s in have liked them. CCI BR2 Primers in stock use specially chosen cups and anvils for added regularity. An independent researcher https://gregorypdrcv.blogdigy.com/cci-250-large-rifle-magnum-can-be-fun-for-anyone-47153523