I have a 6 lb 1 oz 12 GA William Cashmore with 27"'barrels and 14-1/2" stock. I shoot only 1 ounce or less 2-1/2" factory ammo or my handloads. I also have a 4 lb 11 oz Verney Carron 28 gauge. I do occasionally shoot 1 oz through it, but only in the second barrel. The first barrel always has 3/4 oz loads. The one ounce charge is a little uncomfortable in so light a gun. Besides, when I do my part the birds fall just as hard with 3/4 oz as with one ounce.