Shooting an Remington 1187 3" model with a <u>28 inch</u> barrel. Went with the nitro 4x5x7's and the rhino .670 constriction choke tube. The guys at nitro suggested I go with the .670 over the .660 stating that the .670 constriction would be best for the longer barrel. My question is why ? Anyone else use this setup?