Not sure why you think the military and its snipers of the world stopped using the 7.62, but that is not correct. It is still the primary sniper caliber world wide. I read somewhere that socom was going to convert their semiauto snipers rifles to the needmore, but can't confirm if that is correct. If so, it's stupid. The vacation spots our Marines and spec ops troops visit, don't and will never carry a needmore. So if our boys and girls run out of ammo, good luck funding needmore rounds in Somalia, Qatar, any of the " "stans, etc. If the world went to hell tomorrow, all these guys that think all the prcs, needmores and all the other latest and supposedly greatest rounds are the best thing will either be smart and pick up an ar15 and an ar10 or other 308 and a 300 win mag or they will be fools and quickly go the way of the dodo. I'd bet the 308 has killed everything on the planet too. Unfortunately elephants, tigers, lions and rhinos included albeit illegally. Polars and grizzlies legally by Inuits, no thanks. And most everything else is just small stuff that even a needmore might take at short ranges.
I love my 264 Wins and my 300 and 340 Weatherbys, but my first big game rifle was a 308 and I have and always will have several of them. I hunt with one in VA every yr. And for decades it has been a one shot deer slayer and has removed the head of many gobblers. Don't forget Carlos Hathcock hammered many many bad guys all around the 1000yd marker with them and Snipers have killed bad guys at near 1400yds with the 308. So I guess u could say it is certainly qualified to be called a long range round and is very viable if you know your limitations and respect its. As with all rifles, the shooter has to do their part. JOMO