Well, after some POI trials yesterday chairgun tells me 55 yards should be 43 clicks on my turret. It turns out it actually is 30 clicks. Power is quite constant :confused at 772 FPS, I can't believe chairgun can be that far out so its either my turret is faulty or I have POI shift as explained in the link below?
I do have an AJP riser rail, Big Nikko mk3, Barry Taylor side wheel, bubble level, Rowan top turret & pointer on the MPR. Could all this mass be causing this shift as the barrel isn't floating?