Maybe I wasn't clear in my thread response. If I use the Wheeler level product on the barrel and the top of the MOA one piece mount and use a level to put my scope vertical level with the one piece mount and the top of the rings, I find when I mount my rifle and look thru the scope the vertical is canted a few degrees counterclockwise or to the 11 o'clock position based on how the buttstock fits into the pocket of my shoulder.
Instead of trying to force the vertical reticle back to 12 o'clock which feels unnatural, I have gone to a process where I twist the scope vertical reticle at 12 o'clock when I mount the gun to shoot. That way, even though I may not be level with the top of the rings/MOA mount level, I've got a consistent vertical/horizontal reticle that I can replicate from shot to shot. My barrel doesn't care where reticle is a long as I do the same thing over and over. I never consider the lines on the target itself for alignment...I align the vertical and horizontal posts to level based on how I mount the gun and focus on a target. As I am a hunter more than a target shooter, this is my way of ensuring I get consistent on my mount and consistent on my scope reticle which is tied to my sight-in grouping.
My way of saying I don't see the need for a scope or ring level as it doesn't match my gun mount posture.