I treat most of my .30 cast bullet target rifles with a 1 1/2° included angle throating creamer to create a gentle taper that seems to help ease bullets gently into the bore straight. I have a sewage die made with the same dreamer to put a matching slight taper on a select few suitable bullet designs. Every little bit helps in this game. 1/2 MOA accuracy and sometimes better, with cast bullets, is the result of a lot of anal skullduggery.
For cast bullet hunting/plinking loads in more prosaic rifles, I don't bother with such shenanigans. I just load 'em and shoot 'em.
