Ammo that matches the groove size is usually going to shoot the best. The better quality ammo that matches, the better the rifle will shoot. If the groove diameter is .222", that is what you look for. Go bigger and it will hurt accuracy, smaller also.
Buy the best shooting ammo that matches the groove size for best accuracy. You can slug, then measure to find the groove size.
Do you know your groove size is .224", I'm betting it's closer to .222".

John