The TulAmmo KVB-7.62 primer is NATO spec and cheaper than most and produces the bottom velocity SD's I've noticed. The only real complex downside is They are really a slightly limited in shape, so you would like to be excess cautious for getting them under flush with the case head. https://z-ndh-tchen-large-rifle84623.estate-blog.com/30905358/detailed-notes-on-cci-zündhütchen-large-rifle-200