searching for info online...
Found this link with pictures of record HSB from various states. The Indiana one looks huge for a northern state type growth pattern.

Photo album of HSB record catches, 2 pages

Also see in this webpage they list state record for Michigan caught in the Kalamazoo river about 30 miles from my pond. Now how did a HSB get in the Kalamazoo river? I guess white bass are found natively in Michigan but how did it find a striped bass to mate with?

see table about 1/2 way down this web page. MI record 10 pounds, Indiana 18!

Table of records HSB