Federal Gold Medal Match primers/Magnum

[Martini2]

Over years have used plenty Fed 215 Mag. (less $$) Primers in 45-70 loads. One thing to note is they have coating and seems to cover the flash hole so powder is less likely to sift in to primer. I.E. without paper wad inside case or in primer pocket. My best loads produce single digit SD velocity wise with these hot Feds. GM match only means bit extra eyeball on production lines should be more better ;-)