I'm not sure what you mean by stunt??
I have 230 grain TC bullets that I cast. I am using wheel weights and dropping them in cold water. They come out hard and will only slightly scratch with the finger nail.
I haven't seen any loads for 45 long colt rifle. I'll have to get some 250 grain and try them out.
I got the 8.5 load from http://stevespages.com/451p_3_225.html