When I am casting 400 gr. .40 cal. bullets, no matter how I adjust the sprue cutter I get a slight bevel to the base of the bullet. It is uniform the entire circumference but it is not square or sharp. How important is a square base ?. I am thinking that when I size the bullet it might "iron out" the base. I will be only shooting out to 300 yards and most of my shooting problems are ME.