My 1911, 20 gauge VH Parker with 2 1/2" chambers,
digests AAs with ease and handles standard 1 oz field loads just fine but due to it's six pound weight, is unpleasant to shoot large quantities of the latter. I do not hesitate to use the 2 3/4" standard 2 1/2 dr eq, 1 oz field load in it for the infrequent shot at grouse.
90 years of such abuse. Will she stand another 25 (If I'm lucky)? Stay tuned!