Here's what Finn Aagaard had to say about the penetration of the 6.5x55 vs the 30-06 in his excellent Hunting Rifles & Cartridges.

In the test, the 140's from the 6.5x55 were loaded at 2,700 fps. Right where the 6.5 Creedmoor lives.

Finn doesn't list the 30-06/180 speed, but based on his extensive writing about that round, I think it's safe to assume 2,750 fps +/-

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“Perfection is Achieved Not When There Is Nothing More to Add, But When There Is Nothing Left to Take Away” Antoine de Saint-Exupery