If my memory serves me correct, they say Shockwave is larger framed and his first calves are Hitting the ground this year.
http://cattlevisions.com/Composite/shockwave.php
the Rock Star calves I have seen are larger framed and throw some color
http://cattlevisions.com/Composite/Rock%20Star.php
PS
I dropped an email to Hara Farms to double check. I am interested in using Shockwave this year.