I prefer something a little heavier than the 55 grains just to help with the bullet drift a little more (I know it's not much). I have used Hornady 95gr SST's that have worked very well. I have also shot Hornady 100gr BTSP's with good success, although they didhave more drop than theSST's.
Just as a side note I have not had very good luck with any of their light magnum loads, for some reason I could not get any kind of accuracy out of my rifles with them, yours might differ though.Good luck!