Front to rear the rings are on the piss. i.e. they are not in line with each other in an angular plane. I'm betting the rear hole in the back ring is not in the center line with the rest, canting the rear ring. The action has been trued, and I have had a PT&G oversized lug installed so that also should be true. The barrel was fitted by True Flight and I am confident it also is straight.
Update. As I type, the gunsmith has just rung and the rear hole is out 0.4mm. Will re-drill and tap. Yay problem sussed.
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