im sure your aware but always check the barrel for the caliber to be shooting .233 and .556 are not the same. just as 7.62x39 is not the same as .308 my ar-10 wont cycle 7.51 but works fine with .308
We're not comparing 22s with 223 Remingtons, we are talking about Military vs. Comerical names for the same round.
Like the 30 cal M2 vs the 30-06.
You'll get a bigger difference using differant reloading dies.