Krags seem to be almost human in their love of various food.  Some will feed spitzers reliably... some won't.  Some are accurate with the 180 gr sp... some aren't.  Most will do well with the standard 220 gr rn "Ball" round, but not all.  I have a friend who practically shoots out the X at 200 yards shooting a 165 gr rn bullet... and I had a hard time holding the 9 ring with them!  The trick is to find what your particular Krag loves best... and then stick with it!