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Too much YAW. The 55 grain fmj are much more accurate and the 62 FMJ are better too. I suspect the steel core is causing the YAW. The best consistancy that I can get is about 4" group at 200 yds. My ARs shoot very accurate with other bullets, but the mil-spec 62 sc stuff I can not get to be super accurate.
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It is critical to specify what barrel twist your statement refers to. I am convinced that most discussions about accuracy in 223/5.56 are (or should be) about barrel twist rate and what bullet weight the shooter expects to shoot well (either correctly or incorrectly).
For example, your gun could have a 1:12 twist and shoot that way. But a different gun, with a 1:9" twist, may shoot both those bullets very well. While another gun, with a 1:7" twist may spin lighter bullets at so fast an RPM that they lose structural integrity, while shooting 80-90 gr bullets extremely well.