Why 5.7? -- 5.7x28mm vs 5.56x45mm

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In today's video we explore the question I always get when I talk about 5.7x28mm- Why use 5.7? To explore that question we are going to compare 5.7 against 5.56 with other references to 5.7mm vs 22. To understand the genesis of this cartridge we have to l