as tom said depends on a few factors mostly condition and wood grain in the stock will play a factor - if it was a more desirable caliber like 240/257 are the most popular u could see those values double.
Allot of 300's online for sale you can do a little research and honestly stack yours up against them and see. Guns re-sales are cold right now most people looking for deals when couple years ago it was a sellers market. 300/7mm's for whatever reason do not get as much hype. I guess all the smart people already own one and everyone is jumping on band wagons with modern rifles chambered in prc's and rums - i pull my weatherby's out and the new kids look at me I have to remind them these calibers were hot decades before the new stuff you have lol
Good luck with your sales,