I shoot one in my 870 SuperMag with WinExtended #6s and it is just downright awesome. Like the previous poster, I've patterned out to 60yds, and I am quite confident it would work. I won't take that shot, but it would work.
The one thing I really like about it as opposed to say, a Rhino choke, is that I get a slightly larger pattern at 20yds. But the pattern stays full and uniform as far out as I care to shoot. Very effective.
I do shoot a Remington. I'll PM you.Kinda like my post said above, I like the Jellyhead a little more than some other jokes because I do get a slightly larger pattern at 20 yds. It seems to throw a larger but yet extremely even pattern.
If you shoot a Remington, I'd be happy to meet up with you and let you try it out sometime.