Ryan:  The "knob' of your bolt's cocking piece is blurry in your pictures.  It appears a little odd.  Like there may be a small steel square fitted into a dovetail.  Lyman use to make a cocking-piece 'peep' sight that fit into a dovetail machined into the cocking-piece.  A clearer picture of the rear of the bolt would help.  Your serial # is close to the range of numbers used on .22 gallery rifles, hence my question about caliber.  Do you know if your rifle is in .30-40 Caliber?  Mallory (The Krag Rifle Story) reported #476045 as the highest serial number in the last lot of 1898 Rifles, manufactured in January 1904.  Your action is 14 digits higher.  There are some interesting questions here!  Maybe your receiver was unused surplus until completed into a hunting rifle by a gunsmith?  It would be interesting to see some pictures of your barrel and front-sight