Good luck with the 162s in the 20"........tested some 160/162s in a 20" M70 long ago......trajectory suffered.
For me, the 140 AB is near perfect in the round, the 150 NBT for a tad more bullet weight if you so desire.
Some folks run a 7/08 hard with heavies, and in a long tube. Sure seems simpler to just step up to more displacement like a 270 or 280, if not a 7RM to keep things simple and not redline pressures. Just me. Shot a good bit of loads from 100s to 162s in a several 7/08s. Either extreme can work, but when you factor BC/SD, MV and trajectory.......I think the 139-150 class wrings out most of the potential for field use on big game. If you are in to serious LR work, there are better rounds.
FWIW I have shot 140s at 2960 in 21" barrels........all I wanted. I'd be very content with a 150 at 2700-2800. I ran a 7RM long ago with 162s under 2900 for shootability and accuracy. Killed great and did not punish me as bad.
In the end, that saying use enough gun..........is met with a mid-weight in the 7/08. I too like heavy for cal, but within reason. I like reasonable trajectory........Some get it, some maybe not using heavies in the modest 308 case..........but once you get enough, more is more....but not necessarily better......and certainly not needed. For North America and even other countries, a good 140-150 is about all you will need.
Last note, I recall Layne Simpson who worked with this round since inception in 1981, as I recall, he was quoted perhaps in the Nosler manual, that a 150 Partition was perhaps a better choice if going more than 140......and more usable than anything heavier. Personally I still agree.
Many ways to accomplish a job..........
Oh, what did I take hunting today? Compact T3x, loaded with 150 BTs