First there was the original 5.56mm "plain" tip M193, then the green tip M855 optimized to penetrate Soviet metal helmets came along in the 80s

When stories of unsatisfactory results with the standard ammo spread from Afghanistan/Iraq, especially with short barrels, some US special units started using Mk262 ammo with 77 grain "match-king" bullets instead

Some then proposed replacement of 5.56mm with the new 6.8mm SPC or 6.5mm Grendel

Now comes the latest "solution" for the 5.56mm: a solid copper bullet with greater penetration capability

http://www.65grendel.com/forum/showthread.php?t=3964

ציטוט:

Brown Tip 5.56mm for Short Barrels May 16, 2008: U.S. SOCOM (Special Operations Command) has used its own, bureaucracy free, budget to design and manufacture special ammunition for the short barrel (10-15 inch) weapons (like the M-4 and SCAR Light). The new ammo, referred to as "5.56 Optimized", or "brown tip" (because the tips of the bullets are brown for easy identification) uses a bullet that is solid copper and 70 grains in weight (compared to 62 grains for the NATO standard 5.56 bullet). The solid copper design is believed to be based on a commercial design (the Barnes Triple-Shock X) that was introduced five years ago. The new round was designed to achieve better accuracy and hitting power at the ranges (under 300 meters) the short barrel weapons are most effective at. The brown tip ammo costs more, because of its unique design and small production runs, but SOCOM doesn't worry about that when it's for something that will make its operators more effective, and help keep them alive. -Strategypage

Sorry for the English... I was a bad student in Hebrew school

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