I'm not buying that a modern gun of quality manufacturing reputation will have drastically different effective choke results vs. another of similar quality shooting the same ammo when constrictions are identical. Guns made by the same maker will have same/similar patterns for the same choke constriction unless something is amiss in the bore/choke.

If it weren't so, buying a gun or Briley chokes by constiction would be meaningless.

I dunno about you guys, but all the guns I've patterned gave pretty much expected patterns for their respective constrictions.

I'm guessing the development of chokes pursued the maximum density patterns that could be achieved, then lessor constrictions were made available.