I bought a 50 count box of nosler brass. Select, weighed, trimmed, and tapered at neck. Never have had a primer failure before this. They were installed by a Lyman primer tool and went in quite hard on each case. Had two failures on first 20 rounds. Never had a failure before loading once fired remington, wihchester, or federal brass. They were cci BR2 primers in the 243 nosler unfired brass.