I hope I can be of some help, just off what others say and not experience... Im a rookie too.

sounds like the gun will be great'
I shoot for goose, 3" BB , I have been told you can use BBB,BB,#2's for goose.

I have tried two ways to cook goose, one is to cut into strips, dip in egg and bread with potato chips(crums), then fry

I also took the same strips and fried them in butter and onions, with garlic and onion.. good luck..dont over cook or it gets tough, make fairly small strips and keep it pink.