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The jacket material
is specially developed low-carbon steel, coated with copper which
passes through double heat treatment while being made. It allows to
finish properties of this material up to a level of copper.
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In comparison with
other .223 Rem cases, internal volume has been increased by 8%, which
allows to decrease pressure by ~10Mpa saving projectiles' kinetic
energy, and stabilize ballistic characteristics of cartridges.
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Applied jacket
material together with pressure and powder gases temperature decrease
essentially diminishes barrel wear and life on the level of
projectiles' copper jacket
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All the projectiles
have boat tails for improving fire grouping.
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High accuracy of
neck making eliminates cases influence on fire grouping.
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Fire grouping tests
during cartridge manufacturing a performed in 7 to 12 inch twist
barrels. Thus, maximum projectiles dispersion does not exceed 10 cm at
a distance of 100m. Customers are recommended to use slow twist
barrels while shooting light projectiles, on the contrary, heavy
projectiles are preferred for quicker twist barrels. The results go
better by 1.5 to 2 times in these cases.
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The changed
configuration of grinding and optimal allocation of hardness on case
body allows to extract it quite easily after firing even in conditions
of fouling.
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A case is able to
withstand pressure up to 700 MPa and can be extracted from a chamber
without effort.
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A specially
developed non-corrosive "Berdan" primer with increased width
of bottom has high sensibility and is safe. It is more reliable in
comparison with "Boxer" primer.
