First off, the .375 Win is not a shoulder buster, stout, but nowhere close to a .444 or .450. Or even the .307 Win BB or .356 BB for that matter.
Quite a bit more moxie than the .35 Rem though, excellent < 200 yard rifle for almost anything in North America.
As far as value, having it set up for a side winder scope actually takes value away. $550 to $750 in todays market should be right in the ball park.
I'd like the brass, only have a hundred or so left to load.
DO NOT USE .38-55 brass in the .375 unless you take .100" off the length of the brass. IT WILL JAMB into the chamber of the .375 and could cause dangerously high pressure!
Love the .375 Win though, actually have two spare original barrels, had three but wore out the first....travelled the country shooting Jim Bridger matches with it, probably got 18k to 20k of rounds out of the first barrel.