I’ll vote for the rcbs style dies with the threaded expander rod and lockable die nut not the lee collet long expander rod gizmo that pulls out of the collet or the aluminum o-ring die nut that lee uses. The only lee die that is a good idea imo is the seater die with the big easily adjusted aluminum knob. I put a line on mine so I can do slight adjustments, 1/2 turn, 1/4 turn etc. You are in a good place for all things Krag which are from Norway not Denmark I’ve been told though there is a Danish Krag?. Good luck on your reloading.
I use a .308 Winchester sizer die that I neck size with that has a .310 expander button i think.