Here's a quick compare for things anyone can buy and saami pressures comparisons and apples to apples as possible comparison on popular 'hunting' marketed loads from one manufacturer. I had to add the 300 Win Mag into this equation to lend perspective as to why the manbun is such a stud, why it's the 21st century interpretation of a .308 win, and why it will stand the test of time just as well or better.
6.5 Creedmoor 143 gr eld-x factory load, .625 bc, .293 sd, 2700 fps launch
308 Win 178 gr eld-x factory load, .552 bc, .253 sd, 2600 fps launch
300 Win Mag 178 gr eld-x factory load, .552 bc, .253, 2960 fps launch
1800 fps impact at my elevation comes at; (a common minimum on game threshold by many hunters for most big game)
6.5 CM - 765 yards (160 yard 21% advantage over 308 in distance potential on game)
308 Win - 605 yards
300 Win Mag - 840 yards (28% advantage over 308, only 9% over 6.5 CM)
20" wind drift at 10 mph comes at; (a common max limit guys can actually hit well with on game in the field)
6.5 CM - 600 yards (tied 1st place with 300 WM, 9.2% advantage over 308, 9.2% higher hit probability another viewpoint)
308 Win - 545 yards
300 Win Mag - 600 yards
Recoil Energy in 8.5 lb Rifle comes at;
6.5 CM 143 gr - 11.7 ft/lbs (26.9% recoil advantage over 308, 61.8% over 300 WM!, the majority of population can shoot sub 12 ft/lbs well, falls off quick past 15 to the few)
308 Win 178 gr - 16 ft/lbs
300 Win Mag 178 gr - 30.6 ft/lbs
13.7% penetration advantage for the 6.5 CM over both the 30 cals given same impact velocity
AND, this look is just the hunting marketed hornady eld-x bullets. You could do an eld-m's compare also and the 140 6.5 is higher bc than the 143, the 147 eld-m is off the charts on bc and sd...if you tried to compare 150-165 grain bullets in the 30 cals to the 147 eld-m the 308 isn't even in the running, and then there's a-tips, and 150+ class 6.5's that hand loaded will run obliterate anything the 308 can do and run with premium choice 300 WM options (190+ gr options) all the way out to 1000 yards. Don't bring the PRC into it comparisons as it leaves the 300 WM looking pretty sad.
Where can 308 beat the manbun? Not really sure, it can run with it to 400, but so can everything else too, heck a 6.5 Grendel 123 is essentially a 3/4 scale 308 168 only a few fps slower but same bc/sd so even that can run with them to 400 and single digit ft/lbs recoil energy. Anyway, the advantages for 308 aren't really in the ballistics at all, just commonality and availability, the universal 20th century cartridge carrying over into the 21st century...that's the only real advantage.
Barrel life on 308/manbun? Close enough to a draw? 300 WM loses that one by a lot. Trying to give the 308 some wins, ballistically none, but in other categories I'm trying lol...poor 308, master of nothing but pretty good at a lot. There's a new kid in town, all grown up now too and polished just fine, just the way it goes, be a long long time before a new kid comes along to do the same to the manbun...none of us will be around to see it. Our kids likely won't see it either...grandkids maybe.
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