Excellent, logical, mature answer. Thank you for that.
When you say "ballistically capable to 600" do you mean with 140+ class high bc bullets, or also with others? I was underwhelmed by the velocities I was seeing from 143 ELD-X, generally in the high 2600's and occasionally in the low 2700's. My 7mm-08 140's are always mid 2800's and sometimes 2900's so I just didn't see any real advantage of the 6.5 for me. I also didn't feel any of my 6.5's were any more accurate than my 7mm-08 or .308, with the exception of one 120 grain CX load that would cloverleaf but at a disappointing 2750 fps.
I should probably buy a new chrony. I read some of the speeds others are getting from their 6.5 CM, with the same bullets and powder, and it really makes me wonder how. But my .308 based loads and my .300 WSM are pretty close to book, so I dunno.