Thanks great info, never warmed up to collaths action but did find a Raush that had a 2” 16ga chamber that I suspected was collath number 6. Never could get any measurements for those collath chambers.May be it was a number 4 i believe that was 16ga bore 6 was the 20ga bore but I’m guessing again.

Last edited by Jtplumb; 11/15/21 10:03 PM.