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Message: <blockquote data-quote="MoBoost" data-source="post: 1998308" data-attributes="member: 3455">Wrong - once the bullet leaves the barrel only gravity, drag and gyroscopic stability matter. Again, wrong - shape of the case has nothing to do with bullet flight (see above). There is indeed trivial difference in caliber (.308 vs .310) - but for sake of this discussion it is 100% negligible.  Again, this is ridicules - you can use the same darn bullet in either cartridge, one just had more boiler room and can shove the same bullet faster. Apples to apples.  9" 300 125gn @ 2026FPS- 1139ft/lb w .338 BC  <a href="http://300aacblackout.com/resources/300-BLK.pdf" target="_blank">source</a>14.5" 5.56 75gn @  2627FPS - 1151ft/lb .360 BC <a href="http://www.ar15.com/mobile/topic.html?b=3&f=16&t=283506" target="_blank">source</a>Sorry, 5.56 has more energy and better bullet - 300 just can't hang.Blackout is not optimized for nothing - it is just a blind luck consequence of 300 Whisper that 220gn bullet goes subsonic. As far as taking role of SMG - well, SMGs seem to be doing just fine with over-the-counter handgun ammunition - so why reinvent the wheel?Again, there is nothing special about 300 blk - it is the same 20 year old cartridge just heavily marketed to general public. The difference? 300 Whisper had a specific use ... 300 BLK doesn't.If you start with lowered expectations in accuracy department ... what can I say....308 offers greater energy and distance over 223 at cost of recoil and size; 300 offers ... less range and less accuracy and more recoil  ... wtf?As far as subsonic goes - as I said, SMG just do it sooooo well.</blockquote>

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