Semi auto rifle has no restriction on magazine or clip size. Shotguns cannot hold more than 3 rounds.

http://www.ct.gov/dep/cwp/view.asp?a=2700&q=452550&depNav_GID=1633#PVSHOT

I used to hunt with an M1A Bush with a 10 rd magazine. I had the 20 rd mag to mess with the other guys in the club