Quote:
Originally Posted by bushmaster1313
No in between 5.56 and .308?
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There have been arguments for an intermediate caliber but it's mostly talk since the military isn't open to suggestion. Also, it would be like saying that the 5.56mm isn't good enough and would practically be a replacement for it.
The 6.5 mm caliber gets a lot of support.
I doubt rounds like the .257 Roberts, as good as they are in the field, will be able to meet military requirements. It is also an older cartridge without newer powders in mind, even thought it fires a 6.5 mm bullet.
I believe that the .300 Blackout is to be used in the M4, and is similar to the AK-47 round