I’ve had more chances at grouse when moose or deer hunting over the years, years ago we carried .22 handguns ( legally) for chickens but that option disappeared in the mid 70’s I think. As a senior senior now, birds are more my size than moose and I love a light responsive English side by side with at least one open choked barrel- rarely get a second shot. Mostly though for the last 40+ years I’m carrying my Heym Model 22S in 7x57R for moose or deer and the 20 gauge shotgun barrel has a Kreighoff .22 LR insert for birds and bunnies. Many a feed of grouse in moose camp, usually done as coq au vin. Other birds, other guns. My new to me Westley Richards 180 year old percussion double 16 and the sweet little Westley Richards made 20 gauge side by that is presently undergoing metamorphosis will get carried next year.