If you're talking about shot size, I'd say #6 would be best all-around, although I've used #7 1/2 for both.

#6 low brass will do it all. I always liked Win Super X but most will do.

Sounds like I am the odd man out here but in a 20 gauge, I like low brass #4 shot for rabbits and squirrels. It gives me greater range than smaller shot and it tends to hit with fewer pellets that each penetrate the game completely. These combine to leave fewer shot to chomp on with your teeth when you eat that tasty morsel. In 12 gauge, I move down to #6 shot.

>it doesn't matter with squirrel.

high brass for squirrel too, sir

6's are the best for general all around elmer fudding: you might get a shot at dove, quail, woodcock as well as rabbit or squirrel, use 6's

use 2 ,2 1/2 , or 3 inch shells

I've been using #4 high brass 2.75" in my 100 for squirrel with the idea of taking a turkey if one presents itself within 30 yards. Missed just such chances last 2 Saturdays. I agree that there are fewer pellets, and they are a little easier find for eating. Still, the #6 or even #7 1/2 would do for squirrels.

You probably wouldn't like my answer. I shoot squirrel with a 20 bore flintlock double and 6 shot! If not using my smooth bore, I use a 36 caliber Bedford County rifle.

Sorry, didn't mean to repeat myself.