I have some 180gr soft lead Keith "boolits" coming from my caster (I cast my own .50/.73 Round Ball & .50 REALs, but not .357) and need to know how low I can go safely using BP or Substitutes without plugging up a 20" barrel.
It looks like I will have a maximum case capicity of about 15gr BP. I will be using a Lee Loader & dippers.
What I want to make is a heavy, sub-sonic small varmint load like but using BP or Substitute rather than smokeless. (I have about 3lbs of "3F" Substitutes and 2.5 lbs of 4F to play with.)
Thanks.