I have looked all over on here and I know I have seen it before but I can't find it. What is the minimum hardness for gas checked bullets in a 30 cal? Might as well ask about 223 while I am at it in case I ever find a 225 sizing die. the 30 cal I don't plan to push beyond 2100-2300 FPS. The 223 I don't really know since I ave not looked into cast loads for that yet. I read the fryxell book end to end and it is all pistol, nothing at all about rifles.