If you have spare parts, that's a great place to start. Scope, and esp. another barrel fitted to the action. Action problems can be the devil to track down, and another barrel would help. For example, this kind of shot pattern can be brought about by serious ignition issues, such as the striker rubbing against the shroud -- but not if barrel two has no problems.
Without spare parts, you're left with checking everything mechanical, including any protruding or bottomed out screws (scope bases, action bedding., etc.), barrel or trigger housing touching the stock, & on & on. Then -- or first -- change bullets & powder. The newer stuff may not shoot as small, but if the fliers disappear, you've a place to look further.
Etc. It's no fun, I've been there.