Re: CCI vs Remington primers for 300 win mag
Ron would you by chance be using RL 19, 22, or 25 in your 7mm rm? Or perhaps a ball powder? I have noticed that those 3 RL powders and several ball powders from W748 up to Supreme 780 do not care for 215s, they have an inconsistant burn because the lightoff is so fast the powder column burns unevenly/erradically, in those cases a hot but more controlled ignition is better, I no longer use 215s unless I cannot find 215Ms, there is a big difference in my findings that the 215Ms are much better controlled and ever so slightly cooler than a run of the mill 215. I see that you actually mentioned the match version so when I encounter what you have, I simply switch to CCI250 or #34s, if the consistency is still off I go to the WLR. The PMC (russian) standard LRPs are like match grade CCI250s but good luck finding any!