First call for second opinions. My Papazian says 1/3c (80ml) corn sugar for a five gallon corny keg or 3/4c (175ml) for 5 gallons going into twelve ounce bottles.
I scored my 33rd 22oz bottle this AM ;-)
I guess mathematically 22oz is a bunch closer to 12 than it is to 640. Regular normal headspace too?