Re: Best New cartridge in 20 years. I might answer 6.5x47 Lapua.

Granted you don't find many factory rifles and affordable ammo.

Jeff - you said "HBR" - guessing you have an MBA?
DC223 - 130 NABs work well. Not that others might not have an edge.

GA Boy - indeed. Folks finally thinking as I did 20+ years ago. 6.5's. Smaller rounds that beat your shoulder and ears up far less.

Take a look at the 47, and if you want to take it a step further - a 6.5BR or Grendel.