Sounds like a decent deal at $600.. but you’re going to put another hundred or two into it by the time you get it drilled and tapped for bases, pick up some decent bases and rings, etc..
I’d love to own a 9.3x62… but I think I could likely find something similar to what you’re describing closer to the $400 range down here in TX..
Less common NA calibers like 300 HH, 9.3x62, etc sell down here, largely due to the density of hunters that travel to Europe and Africa that live in TX I believe… but rifles in those calibers, tend to end up back up for sale at gun shows and in gun shops at fairly discounted prices once the hunt is over.. this is especially true of the lower cost European rifles like zastava, whitworth, etc.. and even more true of the milsurp sporters built on M98, Springfield, P14, etc type actions..
I picked up an absolutely magnificent 300HH built on a p14 action for $300 out the door (including tax, transfer, tics, etc) a few years back… it needed a re-bluing, and I stripped down the stock and refinished out.. so I ended up putting a few hundred more bucks into it by the time I was done.. but for $500 that 300 HH is now one of the best looking (and best shooting) rifles in the safe..
The guy I bought it from was pretty honest with me.. he had bought it off a guy for $300… and had been toting it to guns shows trying to sell it for almost 2 years.. no one wanted a 300 HH.. all they were interested in a 30 magnum was a 300 WM… he just wanted to get his money back out of it at that point..
I was more than happy to help him out