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Q: Why 5.56 mm caliber is more powerful than 9 mm caliber?

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556 * 556 = 309,136

why you asking me 556-thousands = 556/1000 = 0.556 as a decimal

70% of 556 is 389.2. Which means that 166.8 is 30% of 556.

It is: 556 = DLVI

556 - 223 = 333

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5.56 hands down.

Yes there is a difference. They are physically the same size casing, but the 556 military rounds' chamber pressure is ~10,000 psi higher then 223. Military rifles generally have chambers with a different throat configuration than normal sport 223 rifles. This being said, I would not recommend shooting 556 unless your rifle was designed for the higher pressures.

556

556 * 556 = 309,136

556 = 55,600%

why you asking me 556-thousands = 556/1000 = 0.556 as a decimal

70% of 556 is 389.2. Which means that 166.8 is 30% of 556.

556

It is: 556 = DLVI

563 + 556 = 1019

556 x 2 = 1,112

556 - 223 = 333