I load my rounds with the Hornady 220 RN using 40.0 grains of IMR 4350 and a CCI 250 Magnum primer.  This is about as close as you can get to the ballistics of the original .30 US Army round that our Krags were designed for.  This is what I'll be shooting at the Nationals this year in three weeks.

That said, there are a plethora of different loads and bullets which work well in Krags.  I know a guy who shoots a 150 GR RN bullet in his and regularly shoots 296+ all day long in CMP matches (300 is a perfect score, so you can imagine how accurate he is).  Not all Krags love the same loads, so once you find what works for you in your Krag, stick with it!