I'm gonna save you some trouble and let you know that commenters are going to tell you to use the search function. In the essence of trying to be helpful, your Federal XM855 is good to go.
First. The thought that they are reloads is likely the discoloration from annealing you're seeing on the case. It's normal and not a sign that they're reloads.
Second. M855 and M855A1 are two completely different loads. The latter is not going to be found for sale almost anywhere. Both are 5.56 pressures, and will be hotter than .223, but won't hurt an AR with a true 5.56 chamber.
Welcome to the forum and the AR life.
Last edited by Kdubya; 11-15-16 at 04:20.
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I did not know the man quoted above, and joined this Forum after his passing. He seemed to be a leader of men; both spiritually and physically. Someone we'd all be proud to emulate.
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