I can find multiple threads with this issue about spuhr. Almost zero about any other brand it rings, at least not in the frequency of spuhr.Manufacturers might have a tendency to ‘test’ things with a desired outcome in mind.
Seems pretty easy for us to grab x brand mount and install y brand scope with housing pushed up against it....and applying some of Ken’s numbers, tighten it down with same overall force as directed by 25”lb Spuhr caps.
Bottom line, I find it hard to believe Spuhr has the market cornered on squeezing parallax parts.
There are several high end optics manufacturers that will advise against spuhr mounts if you call them. Spuhr is a good product overall, so no one wants to ruffle feathers between manufacturers.
I have personally had parallax issues with spuhr and taken the same optic and jammed my arc rings against the turret housing without issue.
I’m not saying spuhr is “bad” at all. I’m actually saying the opposite. Because if the combination of one piece mount AND the abundant surface area if the rings, it’s almost too perfect and doesn’t mesh well with an optic that has a little bit of stacked tolerances inside of it. Tolerances that would be acceptable by the manufacturer and work fine in any other mount.