Looking for suggestion on the 30/30 with Lee 150 gr cast GC bullets in Win 94 24" barrel. I have tried IMR 4895 and IMR 3031 in 20 to 23 gr charges and none seems to want to group. I also tried 2400 with worse results. I am not using any filler and would like to avoid that. Bullets are WW+2% Tin sized .310 seated just short of a forced closing of the Win 94 lever.