Mmmm yes don't use the Radway Green brass but I wouldn't rush into a primer change just yet. Maybe someone else with AR reloading experience can comment on best primers. CCI #41 are specifically designed for AR 223 but don't even know if they are available here. Rem 7 1/2s have the thicker cups at 0.025" compared to some of the others @ 0.020" so are a "safe" primer.
Bookmarks