I don't know what people use in the 308 but a velocity advantage is a velocity advantage;that goes for a trajectory advantage as well.
If the 7 Rem Mag were not an effective long range cartridge you would not see so many people stuffing them with VLD bullets and shooting at distance with them.
I have never been in an open country hunting situation where a flat trajectory and high velocity were not distinct advantages, rangefinder or not. This is because (a) LRF's don't always work, and (b) not all animals stand around waiting to be lazed while we fumble with rangefinders.
