RE: is the 3 1/2 in. mag better for goose?
3" pattern much better, but it's all about how you shoot, shot size, choke, and distance the birds are you are shooting at. I am a terrible shot with a shotgun, because I am left eye dominant and shoot right handed. I cannot tell the difference between kent faststeel 3" and 3 1/2', with an improved choke. Lately I have been shooting Blackcloud in 3 1/2" with a modified choke andI have been doing much better. Today I shot Blackcloud 3" 2's out of an improved choke and shot like chit. I've still got some work to do, but I'm definately leaning towards 3 1/2 out of a modified choke. I've always preached that improved is good enough for decoyed birds, but I'm starting to change my tune. Good luck!