Re: Long Range Scope choice for a 300 Win. Mag.
I've got the Conquest on my 300 WM and am tickled to death with it. I looked at the Leupold and didn't think it was as clear as the Zeiss. It wasn't a side by side comparison because they were in two different stores but I did go back to both several times. I didn't look at the Nightforce (out of my price range) so I can't comment on that one.
The Leupold will give you more internal adjustment, but has a variable eye relief.
The Conquest will probably need tapered bases or burris pos-align rings to get you to 1000 yds., but has a fixed eye relief and a side paralax adjustment. (no reaching around to the end of the scope)
Both have user friendly target turrets(although the Conquest has them exposed/no caps) and lifetime warranties.
Hope this info helps some, and remember this is just one guys opinion, best thing to do is get your hands on each of them and see what your eyes like best.
Ignorance can be treated with education, sadly there is no cure for stupidity.