RE: What kind of gun to use?
If it is legal go ahead if you like, however inmy winchester sx2 i have tried several different chokes six to be exact everything from $20 dollar chokes to the $90 mad max choke. Also tried all different rounds all manufacters lead and hevi shot and copper. i have probably spent $400 or $500 to get the best combo possible out of my gun and it is with a $30 carlson choke and federal flite control lead rounds 14 and 15 strikes in the kill zone at 60 yds. I have toped it off with a 1.5 to 4 power scope but that is due to a eye diease that I have.
Good luck and let us know how you do