Once I see any sign of a headstamp I stop shooting my test loads. I won't fire any of the hotter loads at that point and I will go home and pull the bullets because at that point I know they are too hot to be considered safe.
It's also worth mentioning that all of the resizing lube must be removed prior to firing reloads because that can cause a dangerous condition in the firearm from too much rearward pressure as the case slips back against the bolt face.
Otherwise a really good write up.
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