You can’t compare a 6.5 Grendel (which I have and love) or 6.5x55 Swede (which is identical in performance to the 260/6.5x47 Lapua/Creedmoor) to chamberings which offer performance increases ranging from modest (PRC) to significant (Nosler/Weatherby). It also sounds like you’re basing your opinion on the performance of poor quality bullets. I would never shoot an elk with a 123gr A-Max from a 26 Nosler at any range. Throw a 124gr Hammer Hunter in the same gun and you have a completely different level of performance. It’s not the chambering’s fault that inexperienced shooters make poor bullet choices.