12 ga is best for birds. #6,#7.5, #8 lead shot are all good choices for upland hunting. For waterfowl you need to use non toxic shot. I like 2 & 3 for ducks, BB & BBB for geese. BBB would also an effective Coyote/wolf load although I would choose 4 buck for the toothy critters.
...something like the Winchester 1200 pump (or whatever it's called now) is aluminum. And if you can't find something with choke tubes, Imp Cyl works well with lead for grouse, and with steel for ducks over decoys.
I started out with a Lakefield 22 and a CIL singe shot 16 gauge. The 16 kicked like a mule. It was light to carry but has ridiculous recoil. I wouldn't look for a light 12...
I just find a 12 gauge is just too hard on ruffed grouse. I picked up a Citori from Clay, I wanted to take it hunting. I shot on ruffy with it and it blew it to sh!t with improved cylinder choke and light clay loads.
How can a 12 ga with 7/8oz or 1oz or 11/8 oz be over kill for birds . Please explain to me this logic.
This is the logic for saying 12ga is overkill
Where you are matters a great deal. You need to read the hunting regs for your Province as hunting birds with a rifle isn't legal everywhere nor during all hunting seasons. No rifles at all for waterfowl. And a .22LR isn't suitable for wolves. The hunting regs will tell you all of it.
A 18 or 20 inch, barreled 12 or 20 gauge with suitable shot and an open choke is best for upland birds. Grouse, for example, will sit, usually in pairs, until you nearly step on 'em, then will rocket off in two directions with wings thundering while you stand wondering what happened. A short barrel helps get a shot off while they fly out of range. The laws pertaining to magazine capacities are the same no matter what you're doing. Most hunting regs tell you the FA applies.