Chris, you have the big brother to my 2E--- both having been born in 1907. I'm sorry that I can't recommend ammo for your gun, as mine is a 16 with 3" chambers, long forcing cones and, as you said, a joy to carry and shoot. Mine will accompany me to Highland County, VA Thursday grouse hunting. Yours does have Crown Steel barrels, right? Hopefully, Drew Hause, the Guru of Low Pressure loads, will be along to give you a specific load/ manufacturer of shells appropriate for your pheasant hunt !