Ask your father-in-law. This Krag was used by him as well as your father. I am sure he would know its history in regard to 'chambering', ammo that was used in it, and how it performed.

Most of us do not have much to go on, except visual inspection, when we latch on to an 'experienced' military surplus arm.

Your Krag has a family track record!

IMHO - It is hard to find a competent "Gunsmith", nowadays, especially one that knows anything about Krags.