likewise, my light carbon barreled 300WM has a VX-6 on it for that very reason, lot's of glass power and little weight. I think my 3-18 is like 18oz or something, that's half the weight.
You will have to decide whether to mount it and shoot it, then it will be a used scope if you try to sell it.
Or sell it straight off and you said that you got a good deal on it but now you can sell it as a new scope and maybe recuperate all your money back.
Option #3 is mount it, shoot it and keep it but it will always be heavy.
When in doubt, get another rifle that matches the capabilities of the scope!
A heavy .223 or 6 br or .308 perhaps.
Then put an NSX or SHV on the above.
I'd mount it up until funds allowed for the above plan...
I have too many guns.
I have decided to get a gun (later on) to match this scope. Seekins is now making a tactical bolt. I will wait until they make that in a few more calibers. Maybe the 300 PRC. I am going to put a Nightforce ATACR 4-16x50mm F1 ZeroStop .250 MOA DigIllum PTL MOAR C617 on the gun I ordered. That should suit the pro Hunter better.