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I posted this on another thread, but will repeat it here. Many CQB Teams are using 5.56(.223) instead of 9mm or .45ACP SMG's because of the lack of OVERPENETRATION with the more powerfull rifle round. According to tests nad actual street results, 5.56 is less likely to overpenetrate and injure bystanders than 9mm.
At 2800-3000fps(closer to std vel than 2300) for .223, it has more energy than .44 mag, so How is it more powerful than .45ACP again?
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