Any slight change in marksmanship principles will likely show a change on the target.
There is a definite shift as a result of the pressure you applied. (Is it a consistent shift do you know?)
Whether it is due to the stock, harmonics or position you just need to find out what works and stick to it imo.
Just lining up slightly off when you get behind the rifle or slightly forcing your position with out you noticing, will/can cause a impact shift like that. Especially if it is waterline, in my experience.
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