My fellow freepers. I have a few questions about the purchase of a shotgun. I have just discovered how much fun shooting clay pigeons at the local club. I have only been a couple a times and rent a Browning over/under from the club. But that can get expensive and its a different gun each time. The person that I took some lessons from recommended a Baretta over/under. My questions are semi-auto vs. over/under, brand, barrel length, 12 vs 20 gauge? I will be using the shotgun for clays mostly. Thanks in advance.