Does it have a rear support for you to rest the butt on as well? This is a basic little cheapo that works plenty well enough. It will take MUCH of the human element out of the equation. Get it all adjusted to where you are on target with the butt solidly on the butt rest and the cradle solidly holding your "forearm". Trust an old hand at this stuff TN. To do proper load development, you have to take as much of the human element out as you possibly can. I've had guys bring me rifles they said wouldn't hold a 3 inch group to work up a fix for it. All the fix it took was take THEM out of the mix and some of those rifles would one hole or cloverleaf! If your Caldwell is just the front cradle, make you up something solid to rest the butt on and get it to where the only thing you have to do is set and repeat!