I spent a few hundred thousand rounds of .50 cal when I was in the Marine Corps. It does a lot of damage, but not like that and not one at a time unless it's a .50 cal sniper rifle. I've never shot one personally, but I've been on the range when they were shooting them. They're the same rounds that are in the .50 machine guns and they didn't seem to do anything different.
I think that's a MK-19. It's a .40mm fully-automatic grenade launcher. You can fire it one at a time like that and the range is incredible. It makes a lot more sense for the explosion and flying bits and pieces.
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