RE: 3 or 3 1/2???
I must respectfully disagree with the logic. You are running 3.5's and only gaining 1/8 or so oz of shot and the fps advantage is minimal. The question was, 'if i keep my shots under 35yds...'.... I say the 3" is plenty. Sure you can use the 3.5 if you want, do you NEED it...no.
I think too much is being made of fps and loads and not enough on skill. Everyone seems to be trying to gain an edge with technology and speed, a nova or a supernova.....black or camo......who cares? Get yourself a good shotgun you are comfortable with that you can hit consistantly with and go hunting, enjoy yourself and quit worrying about 50fps difference between the load you are using and your buddies.