I was thinking about getting a Remington 870 Express in 16 ga. I think I'm going to get it in 20 ga. instead. My question is what would be better and why, a 26 inch or 28 inch barrel? Is there a difference in performance? Do you get more velocity with the longer barrel? Does one barrel length shoot a better patterns? I'll be hunting grouse, squirrel, rabbit, pheasant and things like that. I'll be shooting a lot of clay pigeons too. I like the shorter barrel but don't really know why you would pick one over the other! Thank's