Not really an answer. Who is using the "industry spec" of 4" at 7y?
That’s just it... I doubt today that you can get that info as it is not required as a spec. However, over the years, more than I care to admit, I have had my share of guns from many makes and models that wouldn’t group better than that. Manufacturer claimed they were within factory specs. Whatever that means. You can probably find some in the classifieds or GB under slightly used.