Price seems a little too good. I suggest you arrange with the buyer to have H&H take a look at it as a condition of sale. Big problems are what I would worry about and H&H can help find those if there are any present. Wall thickness has already been mentioned. I am no gunsmith but I can think of a few things like: Is it on face? What does it look like under the lock plates? Is there any sign of water intrusion and/or rust under the ribs? Have the chambers been cut to 2-3/4". Proof and reproof info?

H&H is making and has available factory ammunition. Usually, the old guns only need a front sight replacement to get decent regulation. I would shoot the factory ammo, get that shooting to point of aim, and then tweak any hand loads I was making up to hit the same place as the factory ammo.

Let us know what you learn.