I haven't had the opportunity to set the rifle up and put some DTI's on it to make measurements. What I suspect is happening is that the receiver is being pulled down into the stock and bowing the barrel upwards. Installing the second screw results in distortion of the bottom metal though it's not visible and function isn't impaired. I believe the problem is with the stock and the reason I am suspect of it is when you tighten either action screw by itself, the opposite end of the bottom metal sits proud of the stock. This concerns me as far as shooting from a rest but the owner has similar results shooting prone without a rest. Weatherby uses a 'pressure pad' which is just a bump in the stock barrel channel to stabilize the thin barrel. Weatherby only specs 1-1/2" groups which would be a vast improvement from what it is now. The group size is around 6" at 100 yards when shot from a rest with factory ammo. The elevation knob on the scope is at max CW just to get it on paper. The Mark V action has a threaded recoil lug that is secured by the front action screw. Action screws were torqued to 35in/lb per factory spec. The mount is tight, rings were retorqued to spec. It has a Bausch & Lomb scope sitting in a Leupold windage mount. It's an older rifle but a safe queen, it hasn't had more than 3 boxes of ammo down the tube if that. It 'patterns' with Weatherby factory ammo.
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