Re: Clearidge Ultra XP5
In my opinion, yes the glass is in the Nikon class, and very close to the Conquest and VX-III. Yes they will hold zero!
The reticle is wire and yes they will hold up to a high power rifle. I don't have a good picture of the mil dot reticle at this time, but the mil dot is set a 10x, so the dots are fairly small.
Let me know if you have any other questions.