The TulAmmo KVB-7.62 primer is NATO spec and cheaper than most and creates the bottom velocity SD's I have found. The sole technical drawback is they are a slightly restricted suit, so you want to be additional very careful to receive them down below flush with the case head. I https://z-ndh-tchen-cci-55004703.canariblogs.com/new-step-by-step-map-for-cci-large-rifle-magnum-46644555