Another possible rebore is to the .375 BSA ctg. made by necking up the .303 British (I can't remember the exact Brit designation). Somebody over here must have a reamer for that, and it is a very mild but effective load for hunting in CONUS. I had a friend who had an original BSA sporter made on a No. 3 Enfield action; nice plain gun. Ought to work just fine in a Krag.