RE: Converting shotgun from 2 3/4 to 3 inch
I have a Remington 870 Wingmaster. It is a sweet shooting shotgun. I love using it for duck and goose hunting. It only handles 2 3/4 inch shells. This has simply never been a problem. I have 2 guns that shoot 3 inchers, but I use my 870 almost exclusively. The few more pellets in the 3 inch shells really aren' t going to change your success dramatically, though they might fill in a pattern for another 5 yards or so. You still have to hit ' em! If the gun shoots well, it would be a big mistake to mess with it.
Honestly, unless you are going to be pass-shooting geese all the time at long range, I can' t imagine the 2 3/4 inch chamber being a detriment.
Get some fast moving 1oz. or 1 1/8 oz loads and let ' em have it.