As the other guys have said, 410 will work for grouse and other small game like rabbits and squirrels and the likes.
The 410's effective range is reduced and not as many pellets covering the same space if shooting it side by side to a larger caliber/gauge.
I learned how to hunt with 410 and still like a 410, you just have to know its' limitations. And try to get a close and good shot.
I suppose the condensed version of my answer is that 410 will do the job, but a bigger shell (shotgun gauge) will do the job better by allowing a farther range and better covered pattern area.