The 6mm failed in our tests for exactly as you say. It's a good performer for range and accuracy, but it didn't manage to dump it's energy on target very convincingly. The problem in our (amateur) test with the ballistic gel is that the 6mm carts had too high of a sectional density and had a proclivity to just clean punch through the gel.
Range and accuracy almost directly mimicked 140gr bullets in the same class, but the 6.5s had more destructive effects on the gel.
We didn't gob off too much about it as drive for the 6mm ARC class of carts in the comp world as well as, it looks, for the military meant that everyone is in love with 6mm, but 6.5 Creedmoor is just better in all respects for the application of force onto a threat.
Also, an observation.... seeing as we are going down this path.... but 147gr ELD-M. Applied Ballistics hates them. We expected poor performance but the 147s were not only consistent (OAL, Dimensions etc etc, not BC as we don't have the means to measure), but performed super well. Like, super super well. Our 16.5" 6.5 Creedmoor with the 147s is up there with the rest of carts in capability.
Here's some of our data for the different guns we tested. Man, 147s are good to go.
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