I was with at a NWTF meeting a few years ago when the debate over 12 gauge 3 inch vs 3 1/2 inch came up. Everyone was chiming in with their two cents worth until one well-respected guy on the committee said. "I use a 3 1/2 inch gun and I'll tell you why - because they don't make 4 incher yet!" Everyone cracked up and the debate was over.