Chambers are 2.75 so I'm assuming that any commercial #6 or 5 1.125oz load would be fine. As the gun weighs 6.8lb it precisely fits the "rule of 96" schema for gun wgt. for ounce and an eighth charge. I've had good luck with 1 oz of 6s on crossing pheasant altho the birds that get straight up at my feet always leave me looking for safeties and triggers and then probably shooting under while looking at tailfeathers. Sort of rooster fever. Thanks for the seat-of-pants advice TB, JCJ and Doverham.
jack