Casting 300 BLK. "ZINC" Bullets! Lead Alternative?

Casting zinc bullets 140 gr 300 blackout with the Lee bottom pour pot. Using Zinc ingots and 2 lee molds. one for the 223.and one for the 300 blk. The casting process takes a little practice. The zinc bullets are light weight for their size. Take a look at a possible alternative to lead for those who can't get it and or can't use it!