My uncle has the same gun with same choke.His is the woodland camo with 28" bbl.Its been his go to gun for the spring for 15+ yrs. He just won't put it down for anything else,lol.I haven't been able to talk him down to a 20 ga yet. He's old school and not a # counter but in his gun, Win XX & HV #6s do best. We didn't count pellets, but from what I saw it was a 120+ type pattern with the XX 6s. I gave him a box of magblends a few years ago and they killed just fine for him that year but like I said he's old school and went back to the Win 6s. The 2 loads you mentioned should do fine, as you know your not gonna get super high numbers from those shells but you should see nice even hunting patterns.