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Simplified version: 5.56 is .223, 5.56 uses the same bullet as .22 but throws it a lot faster. Speed makes aiming way easier, and just like in car accidents, speed kills.
We don't know yet. Shooters of this type tend to be shockingly incompetent (generally because there are other things wrong with them)- and making aiming harder in a life-or-death situation and using a round that isn't sufficiently powerful is incompetence.
I think you meant to say .223.
No, .22 and 5.56 use what is, functionally, the same projectile; the simplest explanation for 5.56 is just a .22 with anger issues.
Sure, the projectile for 5.56 needs to be pointier and covered in copper so it doesn't disintegrate due to spinning at ~300,000 RPM, but it's not meaningfully different in terms of weight (from "slightly heavier" at 55-62 grains to "exactly the same" at 40) and identical in terms of diameter.
22 and 556 bullets are not interchangeable. They are shaped significantly differently, despite the similar nominal diameter. One is a little nub like a pencil eraser. The other is a long pointy spike.
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The bullet is very, very, very different. Like twice as heavy for one thing, 30-40 grains vs 55 to 90 grains.
Plus 223s are engineered for controlled fragmentation while your average 22 is, uh, a lead blob with some copper painted on, lightly crimped into a case. The ones I buy in 1k buckets wobble and can be pulled with multitool pliers.
The 90 grain projectiles are memes, though, as they're too long to fit in the most common magazine; 77 grain OTMs are usable but not particularly common. (Interestingly, it's possible to find .223 with 40-grain projectiles as well.) 55 and 62 are the two most common, and ~1.5x a small weight is still a small weight.
Again, this is the simplest version. (Is a Miata with a 500 HP LS1 still a Miata to someone who doesn't understand what a drivetrain swap is?)
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