David, yeah I know you gents are Super 10 advocates. Walter doesn't have a count on the graded Super 10's. I'd estimate maybe 10-15% just extrapolating from the guns I've seen since I started actively looking for Super 10's about 8 years ago.
Charlie the info is too long to summarize and much of it is in Part 2 of the Double Gun Journal article that will be in its Summer edition, thus it isn't fair to the publishers to do it here. Part 1 is in the Spring 2014 edition that was released last month. Short answer is: they were made for the heaviest 2-7/8" loads and most of the Super 10's had very heavy choking.
Frank
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