I have always got my best groups from CCI primers,,only time I dont use CCI is for the 300 RUM that takes Rem 9 1/2M,,or if I run out and cant find any,,I try and keep at least 2,000 ahead,
there is none tellin how many CCI BR2 primers I have busted,,
I have had excellent results with the Federal 215m primers in my .300 win mag loads. The way its looking I may have to change to another brand of primers.
I tried the 215`s and the 250`s with the RUM and got a couple hangfires,,the people at Alliant said the Rem 9 1/2M was the only primer they tested that would ignite 100 grs of powder when it was much colder than 20 degrees