RGS022,
Mine has a "open" pistol grip, not straight english grip, and has usual tight chokes in both barrels. On that first pheasant hunt with it I used some 1970s Fiocchi 16X65s with 28 grams (1,0 oz) of #6 lead alloy shot at 1300 fps in right barrel because they pattern more openly in all my 16s and Remington black game loads with 1,0 oz of #6 at 1220 fps in left barrel. These Remington 16 gauge loads have 67 mm hulls.
Only problem I had was that on longish shots -- roughly 40 yards -- #6 shot from those Remington loads did not penetrate deeply enough to give clean kills on going away shots, even with up to 10 pellets hitting bird. Pheasants dropped nicely but, were not dead. Next time I will use Cu-plated #5 lead alloy or #5 Bi-Sn alloy shot -- both penetrate deeply into vitals on going away mallards.
Niklas