Quote:
Originally Posted by dave99
Dean, see bolded above. I will check today with the paper clip method or else section the once fired brass with the stretch marks to check it for thinning from the inside.
My next step is to locate a piece of 9mm brass to measure the shoulder position, or else order a no-go gauge.
Thx.
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If Lapua and Norma brass both show the beginnings of case head separation after one firing and no resizing, then you don't need to measure anything more. The gun needs to be fixed before you have a major failure. If there is evidence of separation on Norma and not Lapua, use Lapua, it may be made to a larger spec from the get go and isn't stretching as much. From your other pictures it seems as though the Lapua brass is not showing the stretch mark after one firing.
Excess head space can be caused by the chamber, the lugs in the barrel being cut wrong or worn, or by the bolt itself not being fitted properly, or a combination of all these factors. If it is a head space issue take it to a smith to be repaired properly because you need to know what thing or combination of things is causing the problem.