Too answer your question IC and mod works very well for grouse, I have a AYA #2 with two sets of barrels, IC and mod and mod and full. I shot the IC/mod 99 percent of the time.

Say for those board members that thinks a 28 shooting 3/4oz load is light-look at the pellet count of a 20 shooting 7/8 oz load.

Shoot straight and enjoy life at its fullest