Any pointers? Would love to try some.
A couple of years ago I purchased some Fiocchi "heavy metal free" primers from Western Metal. The interior of the fired cases were amazingly clean.
Right now they are out of stock.
Apparently Federal has gone big into a new primer formula that is lead free and expected to replace most or all of the current primers. Bismuth and aluminium instead of lead. Called "catalyst".
https://www.outdoorlife.com/cartridge-primer-technology-developments/
I'm guessing it's a few years from being on the shelf too though.