Comments by "buddermonger2000" (@buddermonger2000) on "Prototype Plastic Ammo True Velocity General Dynamics" video.
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E Nope. Sure it has a ridiculous amount of powder, a few things to understand:
With a barrel as short as 8.5" you get the same energy from 7.62x51 as 7.62x39, but win tons of drawbacks like increase concussion, increased muzzle flash, and a whole lot more recoil (which only increases with increased powder).
It's also important to understand that for the ranges with which an SBR is applicable, the 5.56 can still pierce modern body armor. The 6.8 cartridge is intended to pierce it at range where 5.56 is limited. Also you can carry more 5.56 in a magazine of the same size as you can for full power.
Thus, the only thing you have from a raptor, is a very loud toy. Only maybe as effective, with more drawbacks, and only possible benefit being streamlining ammo, but you want a weapon which is designed for your CQB Assault squads regardless which 5.56 is half designed for as an intermediate cartridge.
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