7mm Sierra\'s I was wondering what you guys know, think, and advise about using Sierra Matchkings or Gamekings in a 7mm Rem.Ultra mag., 130 to 140 grain bullets? I have a couple of questions. First, which bullet is most accurate? Second, how do these bullets perform on small to medium sized whitetails for both short range, say 250 yards and under, but mostly longer range, from 250-500 yards? Thanks much!