This is neat. This is a very awesome video of a 20mm antitank rifle firing at 16 steel plates to see the type of penetration it can do. As you can see by the slow-mo, it penetrated six of the plated with some pretty hefty holes. For 80-year-old ammo to do that much damage is pretty impressive.
Its always interesting to check out these older weapons to see what they can still demolish in todays world, and this one definitely did not disappoint.