Holding close tolerances on brass is just a matter of spending the time. Also having good accurate equiptment. I always use the same brand of brass. I have a luxuary most do not have TIME. I also spent a life time as an engineer and tool maker. Setting the headspace on my guns I have a good feel, I fire 5 new rounds and record my readings. If I am not happy I do it over.
Probably I was to harsh in my statement, What ever works for you. My thoughts on teaching to work on their gun is teach the proper method and if he wants to shortcut let him thank that out on his own, after all we do not know what his skill level is.
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