Well, IMO, They're a good gun, and a great round.
The .375 Winchester Round needs no advertising in my book.
Last I saw the NIB ones were going for about $1200.00 Bucks.
As far as the Differentiators for Value, I am not sure really what your asking.
They're a good gun, and a good Round.
I guess Condition, and what people can ask for there's!
It does seem like everything else that they just keep going up in Value, like everything else!
What is your LGS asking?
The ammo is around $75.00-100.00 Bucks for 20 rds. 200- 250 grain
Good post. As for "value", it is highly dependent on where and how it is listed and of course condition. Keep in mind that gunbroker has some exceptionally high prices. You might see one in the $2,000.00 range there. Locally, I'd expect to pay about half that or even less. That may just be me though. The last one I saw locally, was less than a year ago and it was the twin to mine. Even made in the same year:
It (the rifle at the gunshow, not the one pictured) was $800 at a small town gunshow and it came with 2 boxes of ammo. That's how I buy though. Many, it seems, don't roll the way I do. Probably why prices are so high on gunbroker. As a hobby, I roam the gunshows and small mom and pop shops. You guys would be amazed at the deals that can still be found, if you just get out and look around. Also, ammo and new brass can still be found. Ammo can be tricky though. Some/a lot have caught on and know its worth money. A couple years ago, I ran across a couple boxes for $25/box and just a few months ago, I ran across a small shop that had 500+ pieces of new starline brass for the 375 winchester. They were wanting too much money and I told them that. They asked what I'd be willing to pay. I told them that Starline sells it, so I would not pay more for it than what they charge. The store owner agreed and said he would sell it to me at starline's price. I didn't buy it because I saw some cheaper. That was at a gunshow for $15/50 pcs. Still kicking myself in the azz for not doing that and that was also last year at a small town gunshow that my club puts on every other month.. It is very nice that you can still find brass and shoot these rifles.