If you are picking the pan up & pouring, you'll get some carbon & crud clinging to the side of the pan. When fluxing, scrape the bottom & sides well usign a wooden paint stick, then skim & pour. it will help. You can & should flux when adding ingots to yur casting pot. That will take care of the small amounts left over form smelting.
"Given adequate penetration, a larger diameter bullet will have an edge in wounding effectiveness. It will damage a blood vessel the smaller projectile barely misses. The larger permanent cavity may lead to faster blood loss. Although such an edge clearly exists, its significance cannot be quantified".