I've been casting bullets for almost a year now and I've acquired atleast a ton of lead from an indoor shooting range. I did a BHN test and it tested between 5-6 BHN. I am considering on heat treating the bullets in a gas stove I picked up at a junk yard and rigged up a digital thermometer. My question is in order to heat treat the alloy, it must contain some arsnic.
Question:
1. What is the best source of arsnic?
2. What is the appropriate proportion/weight to say --10 pounds of lead with a BHN 5-6?