Thread: What could cause this?

Originally Posted by Hugh Shields

@JBNZ I've learnt something new from this blog today, thanks. Getting my scopes dead plumb is something I really struggling with. I'm going to try "The Concrete Wall Method," which I had never heard of.... I also struggle with getting the rifle plumb in the vice (plywood packers), what part of the rifle do you put the spirit level on especially if the receiver is round with no flat surfaces? Is the iron rear sight (removed) dovetail accurately level? Alternatively, is the din rail accurately level? I know a couple of my scopes are not perfectly setup and it is irritating!

@hugh

In the absence of a flat top reciever, if you attach the bottom half of the rings, that gives you a good level surface to use to get the rifle level. If not you have other problems. If the rings you are using have a verticle split like warnes etc, you can fit one flat ring from spare parts collection and then remove it once the rifle is level and cinched in place as per below. Then fit the rings you will use.

To hold the rifle I put a rifle rest in an engineers vice, and then use a small tie down strop to hold the rifle tight in the rest. It takes a few goes sometimes to get it sitting right and level, but once the strop is tight it works well. No risk of crushing any part of the rifle in the vice.