After nearly a half-century of grouse hunting in Southern Ontario, mostly in Simcoe County & the "Almaguin" areas of Muskoka Parry/Sound, I've found that for
my purposes a standard Trap load of 7-1/2's work very well indeed. My handloads over the past 35 years or so have been 1 oz. of 8's in 12 ga. and 7/8 oz. in 20 ga.
at 1200 fps, usually with Win. ball powders ... Super Target & predecessors like(452AA) for the 12 (but have used 700X, Red Dot & Promo) and Super Field (473AA)
for the 20, (but have also used 800X, Unique & Green Dot).
I've hunted both with & without good pointing dogs, and prefer to hunt with them, but have been successful as well without.
When hunting without a dog, make haste s-l-o-w-l-y ... look (and listen) more (a lot more) than you walk.
Yellow birch & poplar always seem to be present in most of my favourite coverts.
Learn the birds food sources and habits and you'll soon figure out where & when to find them.
Hitting birds on the wing is not as hard as some would make out. Getting "in tune" to the flush rather than being
startled or surprised by it is, I think, more than half the battle. Obviously a fairly lightweight gun that balances well,
handles quickly, and above all else, fits you properly is crucial. Whether it's a 12, 16, 20 or 28 matters little.
For choke, the more open the better. Cylinder, Skeet & Improved Cylinder are all reasonably good choices.
Modified is starting to get pretty tight for my liking.
A good bit of off-season reading may also help. The poet-laureate of Grouse writers, Butron Spiller is certainly a great start
with Grouse Feather, More Grouse Feathers & Firelight. Other good authors on the subject include George Bird Evans,
Gene Hill, Frank Woolner, Michael McIntosh & Steve Smith just to name a few.
Above all, keep at it, be ready for the flush & enjoy the outing !