I use only the standard leupold bases with windage screws and have never had one come loose.I tighten them properly and do not use loctite or any type of epoxy.I have these bases on ultramags,stw's and my 338x8mm rem mag so they have been exposed to fair amounts of recoil.I hunt in temperatures from -30 to +70 F and hunt with horses a fair bit so my guns are exposed to most hunting conditions.