I agree with this article. Though my preferred all around round is the 6.5 Creedmoor.
It looks like the 6.5 Creedmoor may replace both the 5.56 NATO and the 7.62x51 in the military eventually...
It's certainly a better sniper round than the 7.62.
From: https://taskandpurpose.com/special-operations-mk-48-machine-gun/
But it’s worth noting that the new contract with FN comes just a few months after SOCOM officials unveiled plans for a so-called “assault machine gun” chambered in 6.5mm Creedmoor, a smaller cartridge than the standard 7.62mm ammo that remains more effective for long-range fire support than the 5.56mm M249 SAW ammo. Here are the details of SOCOM’s new intermediate caliber ammo, per The War Zone:It seems to me a semi-auto only 6.5 Creedmoor battle rifle would be a fine alternative to the M-4 in almost every situation.In testing in 2017, special operators shooting rifles modified to fire 6.5mm Creedmoor were twice as likely to hit their targets compared those using control guns in the existing 7.62x51mm NATO cartridge. Special Operations Command also evaluated .260 Remington and collected data on the performance of all three types of ammunition in the FN Mk 20 Mod 0 Sniper Support Rifle, the Knight’s Armament Company M110 Semi-Automatic Sniper System (SASS), and Heckler and Koch M110A1 Compact Semi-Automatic Sniper System (CSASS).
The testing also showed that the 6.5mm versions of the weapons have 40 percent greater range and less recoil than their 7.62mm counterparts. The round was 30 percent less susceptible to wind drift, as well, making it more precise at those distances.