Thank you, Raimey! The pistol grip plate/cover has 1900 engraved on it and there's a "1994" on the barrels I think on the 5th picture. I was told it was rebarreled around 1990.

I'll look for Brenneke slugs. Would rather do nothing with slugs than something stupid.

Edit: they exist! https://www.brennekeusa.com/products?btype=Hunting&kaliber=20%20GA%202%C2%BE%22
I'll call their tech line, check the choke, etc. and proceed with extreme caution.

Last edited by Mt Al; 11/28/24 10:12 PM.