I would like to improve the performance of 400 grain cast projectiles(commercial) in my 45-70 for hunting. I have plenty of jacketed projectiles, but would like to use cast one in my marlin for hunting sambar deer and pigs. I am currently using 405 hard cost coated which have a metplat of .275. Putting them in my small lathe I have now got a metplat of .390 with out feeding problems. Has anyone tried similar projects.