Seems too soon to tell what the problem might be. Have you developed accurate loads for that same barrel before? If not, I am sure you have more work to do before you can judge it.
I am not familiar with the stock, but the whole action may need bedding. Maybe not if it is synthetic. It is my understanding that the lug should not have any contact with bedding on the bottom, sides or front. If it were mine, I would clear all the material around it except for the rear of the lug.
Having said that, I'd start by clearing the lug as I said, then do more load testing. After that, consider bedding the rear, but I doubt it needs it if it is synthetic.
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