Re: Long Range Scope choice for a 300 Win. Mag.
The most rugged on you list is the Nightforce NSX 5.5x22x50 I would not hesitate to recommend the NSX for hunting excellent glass, recitals and adjustability of parallex and MOA.
The Leupold would be my 2nd choose excellent clarity and available MOA for the long shot.
I have no experience with the Zeiss Conquest.
If you think something is not possible move out of the way so the ones that are doing it can