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Now compare your .308 against a .270, w/premium ammo. A 150 Hornady sst or interbond with a .525 BC and a better sectional density than your .308/180.
.270/150sd is .279
.308/180sd is .271
400yds vel=2238/energy=1668/drop with mpbr zero of 245yds=15.5. total drop is only 41"
So it hits harder with a better SD, has almost a foot less drop, and time of flight to a moving target @400 is considerably better.
Tell me how well the .308 keeps up again?
Sorry bud, I've been having these discussions for almost 40 years. The .280ai or .270 vastly exceeds the .308 on game. We're not punching paper here.
I've seen more than one elk make it over the next ridge with a 300+ yd .308 round in them. And decent shots too. Right in the ribs and they penciled through without expanding. 1800 fps is the minimum recommended velocity for expansion on most premium bullets. At 400yds your .308/180 is out of gas. Back the weight down to get MV up and you lose too much due to lower BC.
All those numbers are great but your average Joe isn't a good enough shot beyond normal hunting ranges to realize all of those "advantages". 300 yards is an awful long shot for most guys. At 300 yards, you aren't giving up anything between a 270, 7mm-08, 280, 308, 30-06, 7mm Rem Mag or whatever. People just aren't good enough in the field to realize the 1 or 2 inches difference in drop. Deer and elk just aren't sensitive enough to feel that extra 50 or even 200 ft lbs of energy. A properly constructed bullet from any of those calibers in their standard weight ranges will do the job.
I take guys out to a meadow that isn't too far from work and let them shoot at a deer mock-up from 100, 200, 300, 400 and 500 yards. You have to walk in about 1/2 mile from a gate to get to it and I tell them to bring whatever they are willing to carry. People start missing at 200 yards and almost all of them are missing beyond 300 yards. You can AI whatever cartridge you want and its not gonna fix crappy shooting.
And from a numbers standpoint, its not likely that someone is going to pick a 180gr bullet from a 308 to go shooting 400 yards. Most 308s are 1 in 12 twist and shoot better with bullets with less bearing surface. I'd load 150gr Barnes MRX on a decent charge of Varget and weight retention will be more than any 150gr bullet from a 270, unless its a barnes as well. You can shoot a lighter bullet if its tough. All the BC stuff doesn't matter out to 400 yards anyway. Until you get to real long range, all that stuff is just numbers to get people confused.