Have you had the rifle examined by a gunsmith who specializes in building accuracy rifles?
I have no experience with that caliber, so don't know what is good, acceptable or outstanding. But none of the groups you have posted would turn my crank and i would still be trying to tweak the rifle.
That said, I do have a lot of experience in trying to make rifles shoot. Sometimes I have concluded it is a bad barrel. More often I find something else. Here are some things I would look at if your rifle was in my hands:
Count turns on the action screws. With the action out of the stock, how many turns on the screw before the threaded section bottoms out? With the action in the stock, how many turns? If turns are the same, you are not clamping the action into the stock.
Bedding material in the stock screw holes. can you see any thread marks in the action screw holes in the stock? If so, the screws are acting as recoil lugs. Run a 5/16 or 11/32 drill through holes to open them up.
Bullet jump. Have you tried the bullets 30 thou off the rifling and also hard into the rifling, to see if the rifle has a strong preference? In my experience, this can be a big group variable.
Is the rifle supported under the forend and at the heel on sandbags? If so, does your cheek touch the stock? This can induce a big variable in the group. I don't shave on shooting day, and just place my whiskers on the stock.