That's a good price for it.
Weatherby rifles in general are not free floated, so don't necessarily worry about it.
You are correct. Given that it is pre-MOA, there is a better chance that it may be a shooter, but that is not 100%. However, you may want to take a look at the test target that comes with the gun.
If I was in your area, I would buy one for $400 no questions asked.
Zachary