Re: Prefered scope/barrel clearance
I just attempted to mount a 56mm NF on a 20 moa base on a very heavy barrel. The medium (1" high) were not quite tall enough. They looked like they might be, but once torqued down there was no clearance.
NF takes the measurement from the top of the base to the centerline of the ring. Some others use a different measurement.
Aim small = Miss small