I'll simplify this as much as I can (off the top of my head)so don't grill me if I'm a hair "off".
A 7mm 162 gr A-max has a .625 BC as you stated.
I need a 208 gr .308 A-max to equal it's BC.
I need approximately 10 gr. more IMR 4350 to push the .308 bullet approximately 150fps slower. Recoil with the .308/.300 is noticeably greater.
If you can't grasp/agree with that, I don't know what else to say.
I gotta take my daughter to school now. Be good.........
Well, let's see...
In real life, I shoot a 300 WM and a 208 A-Max. It's velocity is 2945 fps and BC is .648
To get close to that BC in a 7mm, you need a 180 Berger H VLD whose BC is .659. The Hodgdon site shows the best velocity at 2900 out of a 7 Mag
The 208 drops about a foot less and drifts a foot less at 760
