I shot Federal Heavyweight thru my sons Mossberg Super bantam today. I was using a .572 undertaker. I cleaned the barrel and shot one dove load to make sure it was in line. I then ran a few dry patches thru the barrel. I got 163 in a 10" circle at a lasered 40 yards. The lot number was 5P or 5R. I couldn't make it out. I only shot one time.
That should really do a number on a turkeys head for sure.
In my opinion this may be a little tight. The 10 looked good but the 20 was lacking.