I've also heard that the front band should be slightly loose to allow for some barrel whip... not sure what that means, but I know it makes quite a difference in some rifles! 

Also, with regards to the bullets you used:  Krags are funny beasts... and almost human with regards to the food they like!  What works well in one Krag may be horrible in another, and often, two different bullets will net very different results.  In my 1898 that I use for Match shooting, the Hornady 220 gr RN works well, but the Sierra 220 gr RN is pretty pathetic.  Hornady 220 gr RN FMJ bullets were tack drivers for me, but sadly, they haven't been available for some time now!  My point is, when you find what works well for you... stick with it!  You'll do well   8-)