Well seeing as Buckshot is no longer acceptable for deer I would have to say 000buck should do nicely for Grouse.
12g is a lot of gun for grouse... it doesn't take much to knock them down.... but anyhow, just regular trap loads will do.
meantime, you better get some more shotguns.... 20g and .410 for starters, then a 28g, and repeat as necessary in semi-auto, and side by side.
If you want another challenge try #4 on clays, you'll see how good your aim really is.
For grouse and ptarmigan I prefer low brass #4s as they tend not to tear up the birds so badly as the smaller shot with denser patterns. Truth be told I prefer to shoot them with a rifle.
I technically own a single shot 12 gauge cooey as well as a .410 although they are in my father's name. They used to belong to my grandfather. Besides shooting a grouse on the wing with a .22 isn't the easiest.![]()



























