03-06-2008, 08:54
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חבר מתאריך: 19.09.05
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In addition to what Betis has already said, the 762 NATO has superior effects on other types of barriers than 556.
Remember that the green tip 556 M855 or SS109 was designed to meet the specific requirements of penetrating a thin steel helmet at ranges as good or better than the older 762 NATO round but with other materials its performance is inferior.
from http://www.globalsecurity.org/milit...rt/1986/MVT.htm
In barrier and fortification penetration tests, the 147 grain ball projectile can consistently penetrate two test building blocks
In tests of barrier and fortification penetration however, the steel penetrator of the SS109 could not pierce any of the test building blocks.
More ammo effect information here http://www.globalsecurity.org/milit...11/ch7.htm#par3
ציטוט:
c. Protection. The following common barriers in urban areas stop a 5.56-mm round fired at less than 50 meters:
One thickness of well-packed sandbags. A 2-inch concrete wall (nonreinforced). A 55-gallon drum filled with water or sand. A small ammunition can filled with sand. A cinder block filled with sand (block will probably shatter). A plate glass windowpane at a 45-degree angle (glass fragments may be thrown behind the glass). A brick veneer. A car body (5.56-mm rounds penetrate but may not always exit).
b. Weapon Penetration. The ability of the 7.62-mm and caliber .50 rounds to penetrate is also affected by the range to the target and type of material fired against. The 7.62-mm round is affected less by close ranges than the 5.56-mm; the caliber .50 rounds penetration is reduced least of all.
(1) At 50 meters, the 7.62-mm ball round cannot reliably penetrate a single layer of well-packed sandbags. It can penetrate a single sandbag layer at 200 meters, but not a double layer. The armor-piercing round does only slightly better against sandbags. It cannot penetrate a double layer but can penetrate up to 10 inches at 600 meters.
(2) The penetration of the 7.62-mm round is best at 600 meters. Most urban targets are closer. The longest effective range is usually 200 meters or less. Table 7-3 explains the penetration capabilities of a single 7.62-mm (ball) round at closer ranges.
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After all, there must be some good reason why MMGs shooting the larger 762 ammo like the MAG, MG3 or PK continue to serve in the same armies that have also adopted smaller LMGs like the Minini, RPD, RPK etc that shoot smaller 554, 556 or 762x39 ammo, despite the the greater weight and cost of the 762ammo and the greater size and weight of the MMGs
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Sorry for the English... I was a bad student in Hebrew school
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נערך לאחרונה ע"י zragon13 בתאריך 03-06-2008 בשעה 09:06.
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