A news report about the USS Iowa gun turret explosion in 1989.
My, What a Big Sniper Rifle You Have
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 same dwarfing effect.