@ Metal God did you ever see a piece of Lapua or lake City brass straight from the box that did not have thermal oxidation marks ?
Yes I have hundreds of Lapua brass .
If you do not have any annealing marks on your brass after annealing it is because you either did not get the brass hot enough to oxidize or there was no oxygen present in the room. It is a simple chemical process
That does not seem to be true in my test . I used tempilaq of 750* inside the necks and 450* below the shoulder .
This pic of the 450* tempilaq melting was taking when I saw the 750 melt inside the neck . I just got lucky and had the 450 melting in the pic as well
All I can say is we both can't be right . I do know based on the temp indicators I used the brass I heated up reached the temps you claim require annealing marks to be present and they were not . At least nothing like you see in Lapua or new LC brass .
Also there is less then .5% of of copper in steel and they add zinc to steel for many reasons . This would lead me to believe there is basically no steel in brass . Not sure how steel reacts to heat is a good comparison .
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