In an extreme case (and lots for you to che k first), my mate had this on his rifle.
The rear holes in the reciever for the scope bases were out a touch to one side.
Bugger all I might add.
He was shooting long range way further than you.
Managed to get a carbide end mill the tapping size for the next size up screws, as I said, not by much, and it cleaned up.
He did a lot of checking and soul searching before he did it.
And yup it was it.
It was kicking the scope off in such a way that even though it was centered it threw them off further out.
You might have something similar?
Is your scope square to the reciever?
What sort of mounts, if they are the old school twist in with adjustable rear, maybe they need looked at
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