There is evidence that, historically, Douglas fir could exceed the heights of the redwoods. I once read that the Doug fir has a wider gene pool and that of redwoods is more restricted. I don't know if that thinking is still in vogue, but it seems to make sense.
I don't remember if you've posted the answer before, but what is the tallest angiosperm in Europe? In decades to come, can we expect a shootout between eucalyptus and Douglas fir? What would be #3?
Robert T. Leverett
Co-founder and Executive Director
Native Native Tree Society
Co-founder and President
Friends of Mohawk Trail State Forest