Well the compressed air "dynamite guns" the Navy had in the late 1800's pretty much went away after the Spanish American War:
https://www.wearethemighty.com/mighty-history/short-lived-compressed-air-cannons/
(The USS Vesuvius, launched in 1888, was armed with three fifteen-inch pneumatic guns capable of firing an explosive projectile 1.5 miles (2.4 km), and eventually bombarded Cuba in the Spanish–American War.)
https://en.wikipedia.org/wiki/Dynamite_gun
And the $800,000 per round Advanced Gun System on the Zumwalt class U.S. Navy destroyers was cancelled around 2017:
https://www.foxnews.com/us/at-800k-a-pop-new-navy-destroyers-ammo-is-in-question
And now the U.S. Navy has decided NOT to field a rail gun system:
https://www.msn.com/en-us/news/worl...finally-dead/ar-AAL46mY?ocid=msedgdhp&pc=U531
Lest you think innovation is dead the U.S. Navy is still developing laser weapons so they ARE looking to the future.
https://news.usni.org/2020/05/22/vi...laser-weapon-downs-drone-in-first-at-sea-test
Despite all the innovations (and I am actually glad they are looking into this stuff) it seems gun powder will be with us for the forseeable future. Just for reference it seems the 16 inch guns of the WWII battleships get brought out of retirement on a semi-regular bases, Viet Nam, Gulf War.
https://www.wearethemighty.com/mighty-history/short-lived-compressed-air-cannons/
(The USS Vesuvius, launched in 1888, was armed with three fifteen-inch pneumatic guns capable of firing an explosive projectile 1.5 miles (2.4 km), and eventually bombarded Cuba in the Spanish–American War.)
https://en.wikipedia.org/wiki/Dynamite_gun
And the $800,000 per round Advanced Gun System on the Zumwalt class U.S. Navy destroyers was cancelled around 2017:
https://www.foxnews.com/us/at-800k-a-pop-new-navy-destroyers-ammo-is-in-question
And now the U.S. Navy has decided NOT to field a rail gun system:
https://www.msn.com/en-us/news/worl...finally-dead/ar-AAL46mY?ocid=msedgdhp&pc=U531
Lest you think innovation is dead the U.S. Navy is still developing laser weapons so they ARE looking to the future.
https://news.usni.org/2020/05/22/vi...laser-weapon-downs-drone-in-first-at-sea-test
Despite all the innovations (and I am actually glad they are looking into this stuff) it seems gun powder will be with us for the forseeable future. Just for reference it seems the 16 inch guns of the WWII battleships get brought out of retirement on a semi-regular bases, Viet Nam, Gulf War.