Dick Hosmer is a true gentleman and he generously shares a wealth of useful knowledge.  His observations and 2 cents worth are priceless!
  (It is my understanding that the U.S. Krag has the same metallurgy as a low # 1903 Springfield.  I won't shoot a low # 1903 because a case failure allows hot gases to get into the single heat-treat action with possible disasterous results.  The Krag with its rimmed cartridge provides a Seal to hot gases entering the action in the event of most cartridge case ruptures.  Although not as strong as the low # 1903 action, the Krag is safer in the event of a cartridge case failure.  I shoot my Krags, but with low pressure loads).
  Dick Hosmer is correct.  If you want to shoot hot loads,  get a stronger action!