I've read in more than one discussion in the past that someone thought some Krag bolts were over hardened, they were the ones that cracked.  Others stretched over many firings, without cracking, until they bore on the guide rib also.  And then there's the ones that were lapped.  A Lt Col friend of mine tried that, lapped the lug until the guide rib touched on a new bolt body, then discovered he had excess headspace due to his work.  Interesting to note, his lapping did not take any of the locking recess metal from the receiver, another new bolt body headspaced properly.  Sometimes, a cracked, stretched or highly stressed area will show as rubbing on the bolt body. Thanks for bringing up Flaig's, I need my memory jogged from time about where a curly maple Krag blank I have came from.  Always forget the name of the company!  The inletting on the blank is short enough, it could be used for the US or Norwegian models.