I like my 20 guage with #6 shot. My gun is a sxs with the back trigger on IC and the front trigger on modified.
Try to locate a bag of magnum 8 1/2 shot. Any shot larger than # 7 1/2 gives futile patterns with a 410 if wing shooting birds is your intent.
my 7.5 are patterning quite well. 8.5s or 9s are getting a little small for pushing threw bush IMO. i have taken big blues on the wing at 20yrds and folded them nicely.
Shooting grouse, especially ruffed grouse, is a game of speed. The birds themselves and the terrain they live in dictate that shooting techniques like sustained lead or pull ahead are seldom successful. The birds are too fast and disappear into the bush too quickly. Instinctive shooting is often all that can be utilized, but even other techniques will have to put a premium on quickness.
Another factor is not the distribution of mass, but the total mass. I don't care how strong you are, you can move a six lb. gun from port arms to shoulder faster than you can move an 8 lb. gun. The lighter the better for grouse, up to the point where your gun handling skills cannot adequately control the gun. Very lightweight guns take discipline to shoot.
Shooting grouse, especially ruffed grouse, is a game of speed.
Sharptail
Your grouse must be way smarter/faster than the grouse I've hunted with a .22
It's interesting that different populations of the same species may behave entirely differently.
I shoot a 28ga with #5's or #6's, don't miss too much with that setup, and hardly ever get a pellet in the breast!



























