BL> If you fire an M16 it leaves the muzzle at Mach-3 (990m/s),

 BG> In case you're interested, the fastest commercially available
 BG> rifle cartridge is the .220 Swift, with a muzzle velocity of
 BG> just over 4000fps... 

  1220m/s; mach-4. The back pressure must be incredible. There is a
law of diminishing returns. The 5.6mm load is just as large as the
7.6mm one.

Regards,
Bob
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