when the deer are out at somewhere between 200 and three hundred (you're not really sure) being familiar with the trajectory between different rifles can mean a hit instead of close but no venison.
when i switched from a 308 to a 7 mag i found myself over compensating for bullet drop until i forced myself to think before i shot instead of making the shot instinctively.
There is a whopping inch and a half of difference in drop at the extreme end of your range mentioned there, 300 yards, between the .308 shooting a 150gr and the 7mm Mag shooting a 150gr. Even if you make the 7mm Mag bullet lighter it really doesn't make any tangible difference. Inside 300 yards,
all the standard hunting cartridges have virtually the same trajectory, we get worked up over differences that are imagined not real. Even at
400 yards, further than almost any of us shoot on a hunt, the difference between a 7mm Mag and a .308 is only 4"- less than the width of your palm. You can still shoot at the same point on big game and you'll kill it even that far out. At 200-300 yards, there is absolutely zero difference. The difference at 200 yards is a mere half inch, less than the width of my index finger! The margin of error in a hunting shot at 200-300 yards is far greater than any drop difference between any of the usual choices. So, pick up any rifle you're a fan of, and shoot it the same as any other rifle that does more than 2400fps- they're all the same.

Yes, if we're shooting gophers at 550 yards, a couple inches can matter. But not in this discussion and big game hunting.
Drop
.308 Win ---------
7mm Rem Mag
100 -0.0 ---------- 100 -0.0
150 -1.0 ---------- 150 -0.8
200 -3.3 ---------- 200 -2.8
250 -7.0 ---------- 250 -6.0
300 -12.2 --------- 300 -10.5
350 -19.1 --------- 350 -16.4
400 -27.9 --------- 400 -23.9