I have a friend who loads 150 gr Hornady RN bullets and routinely wins matches with his Krag.  Now I realize that this is a RN vs a Spitzer... however the 150 gr RN is short enough to present quite a jump to the rifling in the throat.  I've tried them and couldn't get enough accuracy with them to make it worth my while... but we all know that Krags like what they like, and his Krag loves 'em!

I also know guys who use A-Max bullets, Match grade HPBT... etc.  Bob Wolfe (madsenshooter) often experiments with different bullets and loads for his many Krags too.