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Based one the links I posted and further reading on silencertalk.com it seems like the main purpose of this round was its impressive subsonic db levels, along with it being ballistically similar to 7.62x39, without the problems associated with adapting that round to the ar-15 platform.
Essentially I think this was to make a relatively quiet round that will work in the standard ar-15/m4 platform and still be a decent performer out of a short barrel. (I think they percieve the advantage is in adopting the whole package including their silencer, rather than just the round itself)
Agree though it seems that they just made .300 whisper a standard cartridge along with the ability to adapt it to this platform in the easiest way possible.
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Vincit qui se vincit
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