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Now the question - do I need better ammo? Winchester double X has yielded very similar results.
a tighter choke would probably help. A Remington ventilator would be my first choice.
Yep, that ammo is not very good. IMO.
I think your gun would do better with different ammo.
Try hevi 13 magnum blend or Hevi 13 #7s....the #7s will do wonders inside the magic 40....u will be amazed
try some 3 inch mag blends out of that choke. Ive gotten deadly patterns at 40 yds in my 870 w/28 inch barrel and that choke.
If that is a non ported undertaker .665....and u don't feel like purchasing a jelly head or similar choke...I had really good success using the federal flight control wad in either the lead 5s they sell or the heavyweight 7s...pick your poison depending on how much you want to spend. Both will slam turkeys....