Clod responds well to being cooked like BBQ, cooking until it renders out and becomes tender similar to a chuck, but, on a larger scale.
Steamship round is much more of a roast beef type of cut, and is often the choice of buffets, as you can get many levels of done, off of one roast. But, it really toughens above 140F.
The SS Platypus, sails again, to the support of the Vets!
"perhaps...but then again...maybe not..."