Lapua make a bullet called the "Cutting Edge", it's a 100 gr. bullet, and it's absolutely devastating out of the .308 Win.
. With the RUM? Who knows...
Speer also makes a 125 gr. TNT or Hornady makes the 110 gr. V-Max.
I've used the Lapua and the Hornady, accuracy was good with both bullets, but exceptional with the Lapua.