It seems to look fine. Hard to tell when not in person. I am getting a feeling you would prefer to use the rifle as is and fireform the cases without flattened primers.
Could you seat a bullet to make contact with rifling? If so it might be the easiest way to fireform your cases. You might even be able to find an accurate. I just wouldn't go for a max load. Only issue is it might not fit the magazine or if bullet is set too deeply into the rifling an unfired round could leave the bullet in the barrel when it was extracted.
I have a friend that made a 22-250 Ackley Improved. He made a fireforming load that is very accurate with the bullet touching the rifling. He gets to use the rifle on varmint hunts plus is making his brass firemformed at the same time.
The false shoulder approach could be accomplished with the bullet seated deeper so it could fit the magzine box making the rifle a repeater. You could use that fireforming load for hunting if the fit when closing the bolt isn't too tight should a second shot be required.