I would stay at that range until you get 1 inch groups standing unsupported.
Then go to 50. I would shoot at 1" squares or circles.
With a decent rifle you shouldbe grouping better. You have a flaw. Find what it is. Are you steady? are you squeezing the trigger or jerking?
Post a target and we can maybe give you some ideas.
Make a targert with five aimpoints per sheet.(like a five side dice). Shoot one round per aimpoint. Mark where you think the sights were when the gun fires on a seperate identical target.