Get someone else to shoot the rifle off solid rests. Most issues with rifle accuracy end up being the shooter
Check the action screws, and rings screws are tight.
Give the barrel a really good clean and try again...
Re crowning is a good idea.
Bedding idea good idea on just about any rifle. Some good videos if you want to give it ago. Search for Nathan Forster or Ballistics Studies, he has a 5 part video series.
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