I use a Keith design(255gr in 45LC) for two reasons, it doesn't have to expand to be effective, and it will penetrate most anything I need it to. I have cast it hard and soft, harder for hunting and use in a Colt Lightning slide action rifle, softer cast for a handgun. It has the best attributes of the other designs and seems to be very versatile in the accuaracy department, in handguns and in rifles. It was developed by one of the best and has stood the test of time.