I've owned a few Leupold VX3HDs in 2.5-8X, and they were once my favorite scope. "Wandering zero" is not exactly the reason i jettisoned them. Wandering adjustments, however, drove me crazy. I can't say they ever lost zero, but they certainly didn't track as they should have, and that frustrated me to no end.
PS: The Kimber 84m is a factory rifle, so they have a few issues, but in my mind, they're tough to beat. The Montana stocks fit me perfectly.
Mine was an older VX-3i. I never had terrible problems with it, but it didn’t seem to like being bumped around.