Interesting, never come across that issue!
When I got my first centrefire (Ruger 308) I was having all sorts of problems sighting it in, no consistency and generally about 4" groups. After a box or two of wasted ammo I eventually figured out the issue... the scope mounted by a gun shop was about 20mm too far forward and I was constantly straining my neck forward to look through it, putting a bunch of weird unbalanced tension into my body and pulling shots all over the place. Slid it back to a comfortable position and the groups instantly dropped to about 1.5" with cheap factory ammo.
Funny how obvious that stuff seems with a bit of experience, but as a newbie I had no idea!
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