Since the Mossberg 835 patterns so well, why hasn't there been an over-bored 20? I know about the invector + barrels and Ithacas , Win X series,Pro bore and such . It just seems reasonable that it could help the patterns of the 1 1/4-1 1/2 oz loads in the 20s . The theoretically ideal field load is a 7/8oz. load for a 20 gauge.
Does anyone know if this has been tried?