Been shooting birds for most of my life and have tried about everything. We have ended up treating specific birds in different ways. All upland birds now get gutted and rinsed in the field. While you can leave the guts in, you never really know if they are ruptured internally. Due to having to toss birds we aged and later discovered popped guts, we always field dress. This seems to help with overall flavor and gets em cooled down quick.
Chukar, hang in beer fridge head up from hooks 1-3 days (depending on age of bird).
Pheasant, 1-7 days in the fridge (gotta hang em) young birds need little to no aging. Big roosters can stay in there for over a week and it only helps.
Huns, no aging. de bone all meat (legs included) and freeze. We grind them at the end of the year for meatballs and sausage.
Sage grouse, same as pheasants. Epic chicken fried steaks from thighs and breasts.
Quail, they get 24 hours in a buttermilk brine as soon as they get home. We fry em the next day.
Hanging can help with tenderizing the meat. It is also extremely helpful in plucking. As for plucking, I only pluck chukar whole. Pheasants get the half back plucked. The thighs and legs with skin on braise into something magical. Never roasted one whole that was worth a damn. Boneless breast meat gets turned into schnitzels and added to casseroles.
Save all the bones. Roast and make some of the finest stock on the planet.
I am hungry now.