On Mon, 14 Jul 2014 08:23:50 -0600, H*a*r*r*o*l*d
wrote:

So which is it, genius, which is the predominant factor in muzzle flip,
weight or barrel length?

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Actually the predominant factor is muzzle velocity assuming bullets of
equal weight. Energy increases as the square of velocity so an
increase from 900 fps (typical light target load) to 1600 fps would
result in an energy increase of 3.16 .