Good,

now as to chamber, I would say 20 gauge and have been mostly
fired with 2 3/4 ammo. May be a carbon ring in the chamber.
Clean the chamber REALLY well and then try a 3" cartridge again
to see if it clunks smile

I would say the 75mm chamber is a good tip.

My Krieghoff K-32 does have 75 mm 28 gauge chambers
but other 28 gauge 3" guns are not common.

Mike

Last edited by skeettx; 08/24/20 02:42 PM.