I like Leupold's Dual Dovetail mounts very much and have several sets...... My only complaint with them is that is you swap rifles and scopes a bit as I have been prone to do, the dovetails will wear out and become loose to the point the rings will move in them...
You're not supposed to separate the rings and bases of dovetail setups once they've been mated, they're a one shot deal. Once they've been put together you leave them as one. So yea, if you turn them out several times they are going to loosen up, but that's not the way they're designed to be used.
