Mine isn't exactly guilt-edged accurate, but it's accurate enough. Have you tried some 148 gn wadcutters?
I'd probably start with having someone else who I know hacn shoot bulleye shoot the gun, then I'd look at the sights. My front sight had become a bit loose over the years so I used a bit of blue loctite to keep it from rocking.
For comparisons sake- what's your best accuracy at these ranges on your favorite gun?
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