I do not think It really is what gun they ended up shot it, that usually exhibits for a base bulge immediately after sizing. I might almost certainly evaluate you sizing die and powder funnel. Some steel-cased ammo features a projectile using a moderate metal Main, but some will not. https://9mmoncefiredbrass12759.theideasblog.com/37346723/9mm-bullets-for-reloading-an-overview