Brian:  That is an attractive "Sporter" you obtained that has probably served a few hunters over the years.  The magazine conversion would usually be a real 'turn-off' to me but your nice pictures show the clever latch system and the Hart Conversion stamping on the cover.  Sporter Conversions are a legitimate, but subjective, part of the Krag Story.  Is it possible the second digit of your Serial Number is a '3' or '6' and not an '8'?  Sometimes deeply stamped digits are misread on Krag receivers.  Number 482520 seems too high and outside most references. What style of front sight does your Krag have?  Let us know how well that Hart magazine conversion works when you take your Krag to the Range.  Chuck

Brian,
I'm curious of how many cartridges that can be carried in the magazine with the conversion. Just curious. Interesting specimen, thanks for showing.

BTW, the cartouche is dated 1900, but when I enter the serial number at this website, a manufacture date of 1904 is shown:

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So, I'm baffled by all that...!   

Brian:  It is likely the gunsmith, who created your Krag Sporter, put a decent looking cut-down rifle stock on her.  It is not surprizing if this is not the original stock.  Maybe your High # Receiver was never assembled into a completed rifle at Springfield Armory?  Your barrel appears to be a 1903 Springfield barrel manufactured in December, 1936.  It was common practice for gunsmiths to replace bad Krag barrels with '03 Springfield barrels.  The '03 barrels were shortened at the breech and rechambered for .30-40.  This is not a bad thing in a Shooter/Sporter, if properly done.  Your front sight is an '03 Springfield sight.  Look and see if the rear of the guide rib on your bolt makes contact with the Receiver.  Gunsmiths often fitted 're-barrels' this way to strengthen the action. I'm attaching a photo of a Sedgley Sporter I have that shows the re-use of a 1905 dated '03 barrel.  A lot of inexpensive hunting rifles were created from Krags and surplus parts during the Depression.  I think the Flat or "Slab-sided" look was influenced by the Reigning Lever Guns in hunting.

Brian:  The work was done by a clever gunsmith!

Brian:  In my opinion, $300 was a reasonable buy.  You have an interesting adaptation of a Military Krag to Civilian/Hunting use.  IMHO it was the Krag that sold U.S. Hunters and Riflemen on the Bolt Action Rifle.  However, your rifle may be difficult to re-sell.  Sporterized military rifles are a very subjective thing.  Most collectors hate or shun them.  A few see them as interesting and part of the Krag Saga.  A rifle like your's should be bought to be enjoyed because you like it and not as an investment.  Your rifle was altered in a workman-like fashion (Not by Bubba).  It is how Gunsmiths made a Living.  Chuck  (It might be useful to research Hart Arms Co.  It is likely this was your Gunsmith).

I definitely bought this for my own enjoyment as a unique hunting rifle, not at all as an investment.  I'm one of the oddballs that actually likes the sporterized military guns (I have a pretty decent Enfield, as well), as they have an actual practical application in the woods.
Don't get me wrong, I love original military arms, too!  I've owned some great Civil War and Indian Wars pieces.  But other than fun range shooting, they have no real practical use, other than as the aforementioned investments - and looking good in a collection....