I mark my case heads with a scratch each time the case has been fired.
My father started doing this 60 years ago with a punch, and I changed the process to a scratch made with a sharp tool. I have been doing it for the last 40 plus years, and it has worked for large amounts of cases shot through my pd guns, and amounts of 50 or less used for competition.
The first thing I do when I start my reloading process is mark the brass. Yes it adds another step, and I really don’t enjoy doing it, but (for me) it makes the management of brass so much easier. A little more work at the beginning saves a lot of work, and organizational headaches later.
With the spent primer still in the case I place the case in a wooden block with different size holes drilled to give a slip fit to the case. This holds the case in place for marking. I mark the case, pull it out and place another in the hole, repeat.
On 204 cases, the stamping leaves very little clear area for a scratch, but the system still works, you just need to scratch across the stamping, and you can still see it.
Lucky for me, my chambers are the same for most of my high volume rifles. The only cases I have to keep separate (for different rifles) is a couple 223s. I mark the case heads, but keep them separate in the reloading process and in storage.
If I wanted to keep cases separate for different rifles, and process them at the same time, I would make a small punch, and strategically place a small dot on the case head to separate them from the others. Just one small dot, and then use scratches to keep track of firings.
The last time I offered this method I was accused of “disfiguring” my brass, so I hesitate posting this. Apparently, I have crossed some line with respect to how my brass should look. The system is not for everyone, and I understand that. It works for me very well.
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Above, ergonomically designed tool, and perfectly drilled holes for holding cases to be marked.
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Above, case fired three times.
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Above, latest ergonomically designed tool for marking case heads, and lower case fired 14 times.
Jim