I just thought I'd share my experience of a new scope mount that I've bought.
It's the DNZ game reaper 1" Low mount. My new Leupold 6x42 fits perfectly in it - I like how the mounting surfaces are really concentric and scope feels really smooth sliding it around before tightening up everything. The scope objective bell measures 49.3mm outside diameter and the clearance with the barrel is about 3.5mm (this reduces to about 1mm if the scope is moved all the way back in the mount.
The aluminium mount is really strong and very well machined. I think it suits my utilitarian nature and rifle very well. It's very light and makes for a very light package with a scope weighing about 380g.
I got it on special on ebay for £55 all in.
I hope this is helpful in some way to someone.