Talley Lightweight Alloy Scope Mounts

What size would I need to mount a Steiner GS3 2-10x42mm rifle scope on a Browning A-bolt? I want the scope mounted as low as possible but not sure if the low size would work. Maybe the medium?

I used low with a 42mm leupold, it had a 30mm tube.

Cool. That's good information.

I used medium on my 44mm , 1" tube Zeiss Conquest...There was enough room that I felt like low would have been better

Low with a 30mm tube, medium with a 1"

MASH for Talley's guide to ring height

I've used lows for 50mm scopes before.