this is going to be my first attempt to cast I am considering an alloy of 16 oz of super hard + 2 oz of 95/5 + 30 oz of lead which will give me 3lb of alloy for a 130 grain 300 blackout boolit at 2000 fps question 1)what would be the bhn. 2) should I use a gas check. 3) do you think this will cast well