 The new model could also shoot any .244 ammunition.Previous Remington 722 rifles made after 1957 with 1 in 9-inch twist could also shoot the newer 6mm 100 grain ammunition.5 

Remington labeled their new 100 grain bullet ammunition as "6mm" when introduced.However Remington continued to manufacture and label the 75 and 90 grain bullet ammunition as ".244" for a number of years.