BL> There is a law of diminishing returns. The 5.6mm load is just
 BL> as large as the 7.6mm one.

 BG> This is far too involved to go into here, but as a one-time
 BG> reloader of my own cartridges, ballistics is a science all on
 BG> its own. There are actually several different types of
 BG> gunpowder, and it's not so much the volume of powder used, as
 BG> its burn rate when ignited which creates the force required to
 BG> propel the projectile from the barrel. Check your library, as
 BG> it's interesting stuff. 

  I was forced to learn this stuff as Thermodynamics. It is dead boring.

Regards,
Bob
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