If it is hard to close with a round in the chamber, and not otherwise, I would suspect a headspace problem. (Too tight). Assuming you are using factory cartridges and not reloads originally fired from a different rifle.
If it is equally difficult with nothing in the chamber but a cartridge in the magazine, I don't know.
Sometimes the front action screw extends too deep into the action and can obstruct the bolt, but I have only seen that when using an aftermarket stock. Also, sometimes a long scope mount screw can obstruct the bolt. Try removing or loosening them one at a time and test it. (Try one, then replace it, move the next)
Other than that, I got nothin.
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