I'm going to do some testing regarding switching from magnum to standard large rifle primers since I have way more of the latter, than the former. For anyone that's gone from magnum to non-magnum in 300-WM and 300-PRC ... you guys have already answered that it's no big deal, and sometimes even "better". My remaining question is ... Would I expect the velocity to decrease and as such, bulk up the charge weight a bit for my early tests, and if so ... how much (5%, 10%, other)?