Why is the 223 caliber and the 5.56 mm considered the same round?

What are the advantages of the CheyTac .408 round compared to the standard .50 caliber round?

• What are the advantages of the CheyTac .408 round compared to the standard .50 caliber round, and I've heard a rumor that it has almost the same power and velocity as it? Why is this?

• Answer:

  Some of the loads include bullets with extraordinarily high ballistic coefficients. It's a big son of a gun, and the velocity of the 50 BMG is nothing exceptional. In terms of "power," you can cover a lot of sins and prove whatever point you want to make by cherry-picking your data. That's one of the charms of statistics. By giving up some ballistic coefficient and sectional density, for instance, you can goose up your muzzle velocity and energy. It's pretty well pointless to talk about a cartridge in those terms without also talking about the specific bullet loaded in it, and even a rara avis like this one has many options for choices of bullet.