Most of my grouse have come in the 30-60 yard range and more. I use a full choke and size 6 or size 4. They are big enough to hit with that size shot and they drop with one or two BBs penetrating. That way you don't get a mouth full of lead when you eat them. I like to have extended range of lots of BBs in the bird... grouse aren't that tough but they can be quite jumpy compared to pheasants or quail. Just remember to let them get out there around 30 yards if they happen to jump up closer to you. Give the pattern time to spread.

I happen to think that a modified choke in a grouse hunting scenario is best. Keep in mind I am hunting Ruffed Grouse in PA. Rarely can you take a shot beyond 35 yards on a flushed grouse. Team that up with the fact that most of the grouse I hunt and encounter are in thick woodlots with loads of brush, and pines. Speed and target acquisition are key in putting the bird to the ground. Many of the birds I have taken are within 25 yards. A full choke in a 25 yards or less situation will tear up the bird. I prefer modified with 6's or 7's

If you are hunting Ruffed, I would suggest skeet or improved cylinder. The rest of you must be hunting Sharptail.

it depends on where you are hunting. In thick woods/ alders i would use a choke that would give you a wide pattern since most shots are in areas that are too closed in to shoot tight patterns. In open areas i would use a moderate choke and 6 shot. Good luck and good hunting!

modified if you get alot of close fast shots

i would use a modified choke. i have never had much luck with a full, because i either miss the bird or make it look like it has gone through a blender. an improved leaves a lot to be desired as far as range goes. madified is just about right for me.