I am shooting a Remington 870 Express 3 1/2 " Magnum. I am currently shooting Kent Fast Steel 3 1/2" with a Modified choke for steel shot. It seems like I am not getting as good of a pattern as I would like to be. I currently shooting size BB shot. I was going to buy some different brands of shells and see which is the best, but I wanted to hear from you guys first and see if maybe I am doing something wrong with my choke, or if you have a different brand of ammo that you know works good in the Rem 870. Any advice would be helpful.