"Marking" brass?

[Gmoney]

I remark with each loading...

[22hornet]

How about trying painting the base of each case with coloured nail polish? The nail polish is quite hard and it will fill the name / calibre stamping on the case. When the cases go through the tumbler maybe the polish will remain in the name / calibre stamp?
 Just a thought......

[Paul Hoskins]

You can buy felt tipped 'paint markers,' which use real paint, and cover the head with diffrent colors to match the gun. This paint will stay in the stamping a long time even in a tumbler. This paint stinks until it dries.     .......Paul H

[chris112]

As was mentioned before, different headstamps (or brands of brass) for different rifles. Works just fine for me with my 2 6mm Remingtons. One gets Remington brass the other gets Winchester. If I get a third 6mm then I will probably have to use your method of nickle plated for the third.