You may have heard the wreck of the Cutter McCulloch, a participant in the Battle of Manila Bay, has been found of Pt. Conception.
The best coverage I have found is on the NOAA website.
There does seem to be an error in that it refers to the guns on the McCulloch as four 6-pounder, 3-inch rapid firing guns. 6-pounders were 57mm weapons (sound familiar?) while 3-inch guns typically fired a projectile of 13 pounds. Those figures are very close to projectile weights of the modern 76mm Mk75 and 57mm Mk110. The confusion may have originated from the fact that while the McCulloch, as built, was armed with 6-pounders, before the Battle of Manila Bay, she was up-gunned.
There is an interesting footnote on the McCulloch’s Spanish American War service.
Dewey presented USRC McCulloch with four of the six 1-pounder revolving Hotchkiss guns taken from the Spanish flagship, Reina Cristina. Each of these Hotchkiss cannons had five, revolving 37mm barrels. These four guns are displayed in pairs to either side of the front of Hamilton Hall facing the parade ground at the United States Coast Guard Academy.
As an advocate of torpedoes on cutters, I liked seeing the McCulloch had a torpedo tube, see, there is precedence.