more info on Benelli Nova 20 gauge setup

[toolman]

needing your suggestions.heres more info.20 gauge Benelli Nova,26 in. barrel withBushnell Dusk&Dawn 1.5-4.5x32mm scope and HS Undertaker choke shooting Federal 4and5shot WingShok.Is my problem the shot or the choke or a combination of the two?Any help is appreciated.Thanks