In other words - is a newer pump like the Nova or BPS as fast as a newer semi auto?
John Satterwhite in his day, shot his 870 pump gun faster than any of us could shoot our new M-1 Super 90's.
Jim Kleaman in his day, could make a M121-B fire so fast that we questioned if is was not full-auto.
Mr Knapp is shockingly fast with the new Nova pumpgun.
So I will parrot my pop's frequently preached sermon, "son it's not the arrow, it's the Indian!"
Given apples to apples comparison, My personal opinion is that a tuned up Benelli Model 121 semiautomatic scattergun is about as fast as it gets.
Good Luck and Be Safe