Use them on every rifle where possible including on my F Class stuff up to 284. Never ever had a scope shift. The only thing I do is modify the cross bolts by tapping to the next size up in metric and use cap screws instead of the small slotted head screws.
They can be a it of an arse fitting the scope. You need to tighten the screws like a cylinder head, a wee bit at a time on each screw or turn screws opposite each other simultaneously otherwise the scope may rotate slightly in the rings.
I also lightly lube the outer shells taking care to not get any lube on the inner surfaces.
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