CT, What's Your Thought on uUper Chest Shrugs?

I’d heard of these before. I know that you pull your shoulder forward, but I still can’t see how the upper chest would take more of a load than the traps. Thoughts?

Have you tried them? I can kind of get my self to feel them in my upper chest but I can feel it better with various forms of flies or presses (look at latest article by Boyce).

Action of upper chest is to pull upper arm in and up.