Well guys against conventional wisdom I tried something a bit different in some big cartridges and the results were pretty amazing. I recently did some loading for my 338 lapua and 338 norma magnums and didn't have any mag primes so I went with the 210m and got amazing results accuracy. I then got in my 215s and did the same tests. With identical weight charges group sizes were half as big with the non mag primers and the chagre weight and groups fluctuated accordingly ie 92gn for example was the best with both primers relative to the other groups but the non mag 92gn group was half the size. My 2 cents but this has happened to me on a few other guns like my 30 hart. Has anyone else experienced this same phenomenon? I have never experiences a non mag not make even a large charge go bang but perhaps others have. For a target rifle it's perhaps different than for hunting where temp could be adverse to ignition. If you haven't tried it please do and let me know what happens next step will be to run it over a chronology to see the differences in es and sd to see if that is also improved relative to the mag primers stats.