guys, I use a Hastings turkey choke in my 11/87 and 20"
patterns are normal at 40 yards.
If your choke is not living up to your expectations, you may want to give one a try.
I had the very wierd experience of patterning some Remington Factory 000 Remington buck for my brother to deer hunt with, and at 40 yards, all pellets were in a 15" circle.
Rich, I think that your pattern at 50 yards is simply outstanding, guaranteed to roll a coyote.