At least with a cannon you are never under poweredTagging back in. Creedmoor has simply been too large to fit the cz527 action that I have grown to like as a light walk around carry rifle. 6.5 Grendel has been as large as I have tried in that little Mauser action, Though I have come to believe the 6mm Arc is a perfect fit in this application. YMMV
When a cannon is what you need, then nothing less will do. How often do we need a cannon? Thus far in my personal experience, the need for a cannon has been near, nonexistent.
I like cannons