To me, corned beef is a brisket, but cold cut corned beef from the supermarkt always seems to be similar to the standard roast beef, except of course for the flavor. The grain structure seems like it would be impossible for it to be brisket. My assumption has always been that the roast beef cold cuts are from something like the rump though. So, grocery store deli corned beef... is it a brisket?... and what is the standard cut for deli roast beef? Remember, I'm asking about the stuff in the grocery store, like boar's head, not what you get at your deli down the street in NY. You'll just make me jealous and dislike you.