Hornady's shape is closer to the original .30 Army bullet.  Sierra's bullet is ok, but it has a more pronounced taper with a smaller RN.  Although they shoot ok, (at least in my Krags) they just come up a bit short in the accuracy department.

Back 15 years ago or so, Hornady offered a 220 gr RN FMJ bullet which was almost an exact duplicate of the .30 Army bullet.  I shot a hundred of them in matches a few years ago until my stash was depleted... and they were the most accurate bullet I ever fed my Krag!!!  I wish Hornady would bring that bullet back.  Now Woodleigh offers a 220 gr RN FMJ bullet, but it's almost $2.00 a bullet - not really what you want to be shooting for matches or general plinking, LOL.