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The different tech for running moly bullets , is they seem to need more neck tension due to being so slippery , guys just chuck the necl expander in a drill press and use some real fine wet & dry...

Just saw the groups , vertical can be caused by the butt slipping against your shoulder , you could try some one else shoot your rifle to see IF you or the rifle has the issue .

Are you using Moly...

I would check to see the brake is tight & shows no sign of getting in contact with the bullet .

It seems you have checked all screws etc , I would pull the bipod off and fire it off sandbags front...