Your rifle was made in 1964. A lever safety and no cartridge counter indicates it IS a 99E, but the stock isn't original. Can't quite tell, but it might be from a 99DL - or an aftermarket stock. Rubber buttplate is not factory.
And.. the accuracy depends on so many things. If you handload, different bullets/powders might help. Optics make a difference. Not to mention the shooter.
I hope your gunsmith doesn't do any more than polish/lubricate the surfaces to lighten the trigger. If he starts removing metal, the gun can become unsafe and be subject to slam fires. These are hunting rifles, they don't have triggers that can be tuned to be benchrest quality.
Welcome to the campfire!
