I don't know what kind of super grouse people encounter in Ohio, but the species out west are easy to bag. (I hunt Dusky, Ruffed, Blue, and two species of Sage/Prairie.)
I use anything from #4 to #9 shot, in .44 Mag, .444 Marlin (consider it a .410), and 12 ga.
Most first shots are 5 to 15 feet, at most. The rare occasion of a second shot is usually 20 to 45 seconds later (after a short relocation), and 20 to 40 feet, at most. So, choke doesn't matter much, and there is almost always time to reload even the slowest single-shot. I generally don't even bother trying to shoot, unless I have a head shot opportunity (at 10 feet, a 12 ga to the chest doesn't leave much bird to pick up).
An "ideal" load, for me, would be 7/8 to 1 oz of #6 shot (at standard velocity) in a shotgun that's easy to carry and quick on target.