If you look at a 7.62 side by side next to a 50cal round, the 7.62 is majorly dwarfed. Even the .338 Lapua dwarfs the 7.62 round. And you know just by looking, the 50cal is a monster. But if you stick a 50cal side by side next to a 20mm round you get the
Metal Storm has created a 36-barreled stacked projectile machine gun, boasting the highest rate of fire in the world. The prototype weapon demonstrated a firing rate of slightly over one million rounds per minute for a 180-round burst.