I have been considering getting a 20 or 28 bore O/U Turkish made gun. Seems well made and $649.00 here. However, I do have a pair of 12pump guns that work just fine and will suffice with lighter shot charges for grouse.
Then there's the 12bore/.222 O/U. Cast 48gr. GC loads in the .222 and 1oz. shot loads (or 7/8oz) both for grouse, sitting or flying.