Mike

I've loaded for numerous pinfire rifles and shotguns
Your biggest issue will be the case rims

There's a guy in Europe who offers some simple and elegant 16b brass pinfire cases
Just buy them and shoot your gun

I make all my own stuff
I'm a machinist though so it's not a big deal for me
You should just flex the PayPal account and get the ready made solution for the problem

http://www.hlebooks.com/pinfire/cal16-01.htm


Also, Henry might have something for you too.

https://www.henrykrank.com/reloading/cases-primers/shotgun-pinfire-cases.html