Yep, got them on my 4 F Class rifles. Nothing on my sporters. See @Puffin comment.
Whenever I see them on a sporter though "bling" springs to mind.
Initially I used US Optics ones. They attach to the picatinny rails and you hinge them out to use them. I was forever forgetting to swing them back in after a shoot so eventually they were going to get damaged. Also I had to dick with them with thin shims to get them to indicate level. I set up my scopes to be plumb thru the bore centre - scope centre and sometimes the picatinny is not exactly level even on a Barnard.
Now only use scope attached levels. They are easier to see when behind the rifle. Also like the fact that when you remove the scope from the rifle for any reason the level stays attached and assists in aligning the scope again when remounted on the rifle.
As far as brands, my current ones are Vortex. Have also used generic no name ones and they were OK. Prefer the brands that have fine thread clamping screws.
Yep, I do the tall target test. Haven't had any where the bubble broke up into lots of smaller bubbles. Maybe this is a viscosity issue with cheaper ones.
Although having said that I did on one occassion have an Anschutz one on my smallbore rifle seperate out. Noticed when getting rifle out of case. I gave the rifle a shake and all came good.
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