i hunt squirrels with either a Ruger MK II 22/45, 6 7/8 inch slab BBL with a 4X Simmons scope or a MK II 22/45 4 inch BBL with open sites.
i had a Taurus Tracker in .22 LR and it was a total piece of crap. with a scope and benchrested, the best group i could get at 15 yards was about 3 1/2 to 4 inches. i traded that gun real quick. i really did like the feel and fit of it though.