Antique as in circa 1592 (Well at least they were based on the antiques.). Film of the testers cowering behind cover makes it more fun.
Tests on cannon recovered from an Elizabethan warship suggest it carried powerful cast iron guns, of uniform size, firing standard ammunition.
"This marked the beginning of a kind of mechanisation of war," says naval historian Professor Eric Grove of Salford University.
Wish I had one of those.