[Unclenick]

Hard to guess without a picture, but is likely to be shootable. Hatcher's Notebook contains an example of a Springfield '03 barrel he turned down to, IIRC, 1/8" thick metal without it blowing up. If your metal is at least that thick between the cut and the bore, especially considering the lower pressure of the Krag round, you likely should be fine. If you don't trust your judgement on the matter, by all means have a gunsmith inspect it for you.