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According to the Meat Bible, the Round can be used to make Knuckle Steaks, peeled or unpeeled. Alternatively, they can make a Top Round Steak by removing the opaque portion of the membrane. the center is the most tender portion of this subprimal.
For the record, in the industry, the Sirloin is generally called a Top Butt as a subprimal cut. Similarly, you won’t find a subprimal called “New York” but Strip Loin.