I have two Leupold scopes that have the disconcerting tendency to give a little jump or wiggle to the reticle when I dry fire the bolt action rifles that they are mounted on.

Both seem to hold accuracy well enough, although I am beginning to wonder if the rifles would be more accurate if this wasn't occurring. This "jiggle" doesn't seem to happen in any of a dozen other rifles that I shoot.

Mounts are tight, bedding is good, action screws tight, so I believe it is some kind of play in the internals of the scope. So what would cause this? Weak springs in the adjustment/erector assembly?

Your theories and experience welcome.