Thread: True 5.56
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Old 01-07-2010, 05:49   #11
mgs
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Join Date: Dec 1998
Location: cogan station, pa, usa
Posts: 3,186
True 5.56 is loaded to higher pressures than most commercial .223...I purchased some factory Federal American Eagle .223 55FMJ years ago that was loaded so hot it expanded the primer pockets (on the first firing) and the brass was junk. This could have been caused by using a 5.56 NATO load in a commercial case (non crimped primer or soft brass). Higher chamber pressures of 5.56 recommend a 5.56 chamber, Mike.
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