Boom

I found this pic a long time ago an Iowa-class Battleship firing its main 16" guns. Look at the shockwave in the ocean and then imagine this thing hurling something the heavier than a Volkswagen Beetle through your house from 20 miles away.




The 16 inch, Mark 7 Naval Gun

In service	1943–1992
Used by	United States
Wars	World War II Korean War Vietnam War Gulf War
Production history
Designed	1939
Specifications
Weight	267,904 lb (121,519 kg)
Length	816 in (20.73 m)
Barrel length	800 in/20.3 m (50 calibers)
Shell	AP Mark 8: 2,700 lb. (1,225 kg) HC Mark 13: 1,900 lb. (862 kg) Nuclear Mark 23: 1,900 lb. (862 kg)
Caliber	16 in (406 mm)
Muzzle velocity	AP: 2,500 ft/s (762 m/s) HC & Nuclear: 2,690 ft/s (820 m/s)
Maximum range	41,622 yds (38 km)