My parents were from the Copper Country (Calumet), but, I was born a Troll.

I don't have leads on re-boring. It's an expensive process and ends with a .35 cal. 'Wild Cat' in the 40,000 psi, or below category.

Any 'buggered up' or 'cut-down' military Krag stock would allow testing a complete barreled-action for accuracy.
It's amazing the interchangeability of Springfield Armory stocks, within a model  group.
(The model 1896 and model 1898 stocks are different in the bolt handle recess area).

With the U.S. Krag, always use a barrel-band or barrel anchor-screw, to keep the barrel secure in its channel.

The Krag trigger-guard/action screws are close together.
Uncontrolled barrel whip will split a stock, horizontally, behind and in front of the magazine area.