The TulAmmo KVB-7.62 primer is NATO spec and less expensive than most and creates the lowest velocity SD's I've viewed. The one technical disadvantage is they are a slightly restricted in good shape, so you need to be extra very careful to receive them underneath flush with the case head. https://andyotxzz.qowap.com/90930485/the-greatest-guide-to-large-rifle-magnum