I don't think the 'scant' style stock is original to the Remington 03 as they were produced.
Stock has no cartouch per auction and looks refinished to me.

The 03 shares bbl thread and shank specs with the Newton rifle. IIRC, Newton would rebbl your (Newton?) rifle w/a surplus 03 bbl and re-chamber for 30Newton.
Maybe a bbl from them and put on the rifle here.
Rem Mod 03 bbl dates would only be of a couple yrs before switching to 03A3 style (43?).
It's a big round with a .525 base dia. Takes some bolt face
& extractor alteration as well as magazine and feed rail work to get it to work.

Well,,it does come from the highly regarded collection vault of CDNN,,maybe that's where the value is.

Just some thoughts.
I can't really see 3K for it.
Maybe Ike's teeth marks are on the other side of the rear sight sleeve from the caliber marking.