Gday mate.
Yeah I had the same issue with my Howa .243, after 30 or so rounds my groups were opening up noticeably. I packed up and went home thinking I was just fatigued or what not.
Once I was home and about to get into cleaning the rifle I found the screws were incredibly loose that the action was moving around inside the stock.
I did mine up by hand with a bit of that blue medium strength Loctite. Coincidentally I think it was the labelled “243” although it has nothing to do with firearms. I did it right and then a little tweak more and I don’t suspect it will need redoing anytime soon.
Where are you shooting out to 200m at?
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