Just a heads up,
I came across the exactly same problem today when i try to fit my Vortex PST with 50mm lens, i had a Vortex Match ring (well know as seekins) medium and it of course didn't fit, SO, i went to my local shop and even the high size Warne ring didn't fit, THEN, one of the guys who serve me there offer me a Vortex cant lever style mount, BOOM!!! It fit like a dream and even have 7 or 8mm of clearance.
I hope it help in the search for the "right ring".
Mac
Photos to come…
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