The 250-3000, the original quarter bore, developed in the 19 teens by Savage I think. I mean you had the .25-20 & the .25-35 but them were rimmed cartridges, this was one of if not the hottest of the rimless cartridges of the time. Now a days they are just known as the .250 Savage & you can find em some times for around 40 bucks, to collectors you might be able to sell them for 4 or 5 buck a piece, as a matter of fact I will give you 5 bucks for one of em, if you want to break up the box, you might even get 10 or 15 dollars just for the empty box to a collector, looks like its in good shape................
Let me know.
When all else fails.