Rather amazing.
https://www.youtube.com/watch?v=jJ3XwizTqDw
It got me thinking. If someone has an artillery luger with 800m sights or a 9mm C96 with 550m sights and has access to a range with said distances, I would provide said shooter with match grade competition 124gr and 147gr ammunition of their choice (Hornady, Nosler, ASYM precision, etc) free of charge just to see how accurate these weapons can be in relation to their sights. Consider it a scientific experiment.