Normally, a core is cut (similar to BGK describes) and the larger aggregate is laid in and run down/packed by the heavy trucks and dozer/equipment that spreads it. There will be other heavy equipment trucks as this project progresses, so you want to take advantage of their "power of compaction" to create a very firm sub-footing. The fancy, lighter grades of finish gravel should arrive after all the smoke clears and the likelihood of another heavy truck coming thru is minimal.
We used "oversize", basically large river rock with clay fines

Completed driveway after the sub-footing is packed in and dressed