Suds seemed to sire the most real muscle of the Shorthorn bulls I have used over the past 15 years or so. They may not have been the prettiest to look at, but they had real muscle. Ar Su Lu Maxwell (sired by Gizmo, I think, out of a Maine cow) threw a lot of thickness, too. My most disappointing calves were out of Double Stuff. They were hairy and small, but he did not throw any real muscle in the calves I got. Double Vision, Double Trouble, and Double Down all worked better as far as muscle goes. Some of the old Maine bulls also sired some thick calves with real muscle for me. We used a son of Etula for several years and really liked the calves.