I have a Remmy 722 chambered in .222 Rem. that my dad bought in the 50's.
It has a 1:14 twist barrel & likes bullets 52 gr or less. If I do my part, the rifle will yield groups that you can cover with a dime at 100 yds. I have no idea what its value is, but it sure is a good shooter.
H 322 was the powder of choice for the ammo used with 52 gr bullets.