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Originally Posted by Otter
Sounds like CrazyPhuD knows a lot more than me. I had no idea the rounds were designed to tumble. That makes a big difference in CCW consideration.
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Well to be fair I own one, so I better know what it can and can't do!(well theoretically) 
The design is pretty cool....low recoil...high capacity and designed to tumble....just need more guns chambered for it!
https://en.wikipedia.org/wiki/FN_5.7%C3%9728mm
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The cartridge has a loud report and produces considerable muzzle flash (when fired from a pistol), but it has roughly 30 percent less recoil than the 9×19mm cartridge, improving controllability. Due to its high velocity, the 5.7×28mm also exhibits an exceptionally flat trajectory.
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Quote:
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In testing, the SS190 and similar 5.7×28mm projectiles consistently turn base over point ("tumble") as they pass through ballistic gelatin and other media, using the 21.6-mm (.85 in) projectile length to create a larger wound cavity.
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