Just found an interesting article in my archives by Vic Venters published in the Shooting Sportsman magazine (sorry but I don't have the date). He says ..." two inchers through the years and has found many to have wall thicknesses of .015" to .018", with one exhibiting .012" walls measured off of original bore dimensions."
Looks like I have answered my own question. But, would still welcome others to share their knowledge and experience with 2" guns.
Bill