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After years of flame cutting barrels through use, it became obvious that
there was some relationship between case capacity, bore diameter and gas
velocity that dramatically influenced barrel life. So we started tracking
barrel dimensional changes over the shooting life of a barrel, or at least
degrees of progressive throat erosion, and came up with this formula for
placing cartridges into barrel wear and tear context. The same formula also
works to gauge cartridge efficiency, the velocity return on powder charges.
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