https://www.reddit.com/r/reloading/comments/yjht7t/diy_primer_cupping_tool_is_probably_mostly_ready/

https://www.reddit.com/r/reloading/comments/xqjf17/are_there_reasons_why_modern_primer_anvils_are/

I proudly present. Also, the primer composition used is H-48, that is chlorate based primer. It was used primarily to the 50's, and some countries like soviet bloc used it far beyond that, and it's proven and reliable.