What is the smallest diameter bullet nose I can safely cast for use in a 45-70 Lever Gun. I am going to order a mold for a Pedersoli 1886 Winchester Lever Gun. I typically shoot it at 300 yards and want the smallest, most ballistically stable "flat point" that can safely be loaded in the tubular magazine. I have seen .22, .25, .33, .34. Thanks for any help.