Also how do you mean it's still 250mm low??? Are you bore sighting and comparing to view through scope or shooting.the reason I ask is that 250mm at fifty yards is a hell of a long way out for adjustment. If bore is pointing at say a tennis ball sized dot at fifty and your X hair is 250 mm below this you will shoot really high not low. To be shooting low,out of elevation it would be the other way around,X hairs above the ball.
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