Hi I have a moss.835, I bought for turkey hunting, but after a couple of years of shooting the 3 1/2's, I changed over to win. supremes in 3" and never looked back, much tighter pattern, and so much easier on the shoulder, funny how you don't notice its kick when shooting at a bird, but when your shooting at a piece of paper, I can hardly hold onto the gun. NO, you don't really need a 3 1/2", a 3" will do the job nicely.