The more I read the more confused I get. When purchasing a boolit mould how does one decide what weight to purchase? I am planning to cast .358 dia. 158gr RNFP 38 spl. I have read where a mould might drop + or - as much as 5 grs. difference. I would think this would have an effect in how much powder to charge. I understand the different lead chemistry causes the problem. How would you solve this problem or would you just take that it drops the correct 158 grs. and drop the correct powder charge for my load? This is for CAS and not paper punching as of yet. NEED HELP!!!!!