That's how a hot dog or bologna or mortadella is made, not "roast beef".I worked for Eckrich Meats between HS and college. I saw the beef hot dogs being made. Nothing but great looking meat, spices etc. It was processed (chopped/ground/mixed/etc) into a slurry and pumped into casings... smoked... cooked... cooled... stripped of the casing... and packaged. Grabbing one as soon as the casing was removed got you a wonderful snack. cannot vouch for other brands or other recipes.
And my friend at Oscar Meyer was commenting on the rodent dropping more than anything.