An interesting observation. Are you working with a factory barrel, or one that has been overbored? If a factory barrel, what type? What kind of chokes?
My Browning Unsingle, .740" bore with a bore matched 40 point Angleport choke tube, gives as hard a break and as good a pattern as anything I have.
I also have a Perazzi, .724" bore with a 33 point choke, that will deliver a quality pattern and break.
The Perazzi will kick you off the station with HCP loads, while the Browning feels like a Tubed Skeet gun with the same ammo.