Does anyone on here by chance or luck own a rifle in this caliber?

I don't but I know two who do.

What do you want to know ?

I have form dies and reloading dies that are hard to come by.

OK

One of them doesn't shoot his, the other already has them.

Looking to sell?
I would like to build a 369 Purdey single shot some day.
They use .375" bullets you know.