If you anneal and prep the same I have experienced no problems mixing the same headstamped brass from new, to brass that is on its last firing.
I have never mixed different brands of brass tho, so I wouldn't know from experience if that is an issue or not, other than what I have been told or heard.
As Gibo says annealing is a simple process. I don't have a flash machine.
I would like one for all my AR brass but you do not need one to achieve good results.
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