re: Suppressor Question

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Regarding the 300 Blackout: It's the 5.56 necked up to 30 cal.

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CP, You're really close, but you left out one small detail. The 300 Blackout uses a shortened 5.56X45 case that's then necked up to 30 caliber 300 Blackout. The length of the unloaded 300 Blackout is 35 mm The overall length of the loaded 300 Blackout round will be about the same as that of a loaded 5.56X45.