Dave in San Diego wrote:
A 50 pound mass travelling 100+ mph should make a hole deeper than just a
foot. A 14 pound bowling ball from the 6th story of a beachfront hotel went
deeper than that many moons ago.

But keep in mind the difference between sand and Florida clay.
Middleburg, by the way, is/was the home of Slim Whitman, and is just
north of where Bo Diddley hails from.
--
Noah