Hard to beat the 7mm' s due to their high Ballistic Coefficientcy. The 175g Partition has a BC of .519! I didn' t see any in my Nosler reloading manual that has a higher BC and, pushing at a very high velocity, will ensure a very flat shooting round. For a factory offering the 7mm Ultra Mag would be hard to beat unless you added in the Lazzeroni 7' s;

http://www.lazzeroni.com/ct_lacart.htm

They have a 120g Warbird that is going almost 4000 fps and, with a 300yd zero, only drops 14" at 500 yards. Of course, as was mentioned, they use a lubed bullet to keep the pressures from maxing out and are very expensive (~$100/box).