Err Wait,....is there 6 shots in the top center target?
Have you tried shoot-> clean, shoot-> clean, repeat? If you have a rough bore its possible that its fouling quickly, although those groups aren't horrid.
You could always try lapping the bore but everywhere you turn you'll get a different opinion on if its beneficial or harmful. Guess the Jury is still out on that?
Although If you decide to replace that tube and don't mind using it to run an experiment before you swap it out, I would be interested to hear if lapping helped tighten up your groups. either fire lapping or just a hand lapping session.
Also I'm sure scope rings/bases have been triple checked, swapped scopes around maybe. Hope it turns out good for you!
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