rebs asks:
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as for reloads does it matter if you use 223 or 5.56 brass as far as accuracy given everything else the same, same powder charge, same brand primer, same exact bullet etc.?
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Yes, it matters if you want peak pressure and case neck tension to be the same. Weigh both types of cases to see the difference. Military brass tends to weigh more and therefore is thicker. With the same component set, that means higher pressure 'cause the case takes up more room in the chamber and neck tension is typically greater. Cut the powder charge 1 to 2 grains going from commercial .223 brass to the military 5.56 stuff and that will probably be OK.
Commerecial .223 fired brass may have its case heads more square with the case axis than military 5.56 brass. That's 'cause commercial rifles typically have bolt faces more squared up than service rifle do. While the difference is small, if you and your rifle perform very good, the difference in accuracy they produce.