If you use the Hornady 220 gr RN (or the Sierra for that matter), set the bullet depth to the cannelure and you'll have the proper standard length.  Be sure to trim your brass to the correct length (I use a LEE 30-40 Krag case length trimmer here... pretty much fool proof). 

Just a word though about trying to duplicate other's successes... not all Krags like the same food.  The standard 220 gr RN/40.0 grains of 4350 is the go-to round... but many other shooters have great success with other loads.  If the standard load works well for you, then stick with it, but you may find that your Krag likes a different bullet than mine, and that's ok too!  Most of us find success by trial and error with our Krags.  I've tried many different rounds in my 98, but ultimately, I'm stubborn... and I DO like shooting the 220 because it does work well for me.  LOL

As far as cast goes, there are others that can speak volumes in that regards.  I do shoot cast out of my cutoff sporter, and I get incredible results, but the bullets are actually provided to me by Bob (Madsenshooter), who got me started shooting cast.  I use that Krag for benchrest Cast Boolit matches.  Bob is a great source of info for Cast shooting!

I look forward to shooting with you this summer, and I'll look for your email and provide you more info on the match there.

Paul