I think you can just carefully stone the sear and striker to make it smoother.  That's what I did, but it was to remove a slight drag.  I shoot in local CMP matches all summer in addition to Camp Perry.

Krag's are already pretty match friendly... as opposed to, say, and Arisaka or Nagant (my son shoots my Arisaka T99 at Camp Perry, and the armorer laughs when he's trying unsuccessfully to get it to trip when weighing the trigger)!