hi shooter,
I've done some searching and also left ?'s on antique boards with no response on a replacement barrel. The link below is for a custom barrel which aren't cheap but the rifle you have is definatley worth the $$ and if you rebarrel you can determine what cartridge or keep the original. personally if the barrel is in good condition i'ld put a scope on it and see how it shoots, you may be surprized. I've become interested in the caliber and if i find any other info i'll send it your way. JMHO
Kim
http://www.savagegunsmithing.com/
New_Rifle_Barrels.html