I've used 30mm XTR lows with a 50mm objective in a Weaver 20MOA base...worked well. Also used 1" Signature Zee mediums with a 40mm objective and had plenty of clearance.
Do yourself a HUGE favor with that long action base and hacksaw the forward lug or two off...it will help immensely with scope clearance and does not impact the integrity of the base in the least. I've done this on Weavers and EGWs and it allows you to use the lowest possible rings (which helps a repeatable cheek weld).
A 7RM isn't going to hurt aluminum rings on an aluminum base...Signature Zees are plenty tough.
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