Anyone ever use these Ultimate 1 Keith Nose conical muzzleloading bullets? I am looking at trying them in the .50 cal. I have 2 inlines, CVA Optima and a New Frontier Bear Magnum(both are BPI made in Spain) and an old TC Hawken. I am looking for a good Elk round for possibly this fall. I was wondering if these are solid lead. Any info would be appreciated.