My guess is a scope needs to be refurbed or replaced if it will not hold its zero and your hits start straying all over the target. You might try to shoot a box and see if it comes back to zero like it should.
Does your scope have the marked rings under the caps with 36 equal markings around the circumference? Do you know what each mark is supposed to represent? 1/4 MOA, 1 MOA?
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