"DSK" wrote
There are accounts of snipers with customized rifles hitting
small targets (like bad guys' heads) at 2200 yards. Now for
an even more extreme (and slightly more on-topic) example,
the battleship USS Pennsylvania, firing 14"/50 naval rifles,
blew a hole in a bunker from 15 miles away, then less than a
minute later, put a second round thru the hole.

WOW!! The good ol' boys at Dahlgren did some pretty impressive shooting using
16" rifles but nothing like that.