I have two rifles in 32-40, my CPA and a Sharps-Borchardt.  It was suggested that I should keep the brass separate because the chambers are likely a bit different.  Since the Borchardt is new i used magic marker on the case head but that isn't going to last.  It seems logical to keep the brass separate but how do folks Mark the brass?  I messed atound in the shop and either filing or cutting a notch in the rim or drilling one or two small and shallow holes in the case head seems to be practical.   

Any suggestions? 

Dave

I keep my brass in cartridge boxes (plastic MTM boxes) and mark the boxes on an Avery label which rifle they are for, how many times loaded, and interspersed among the hash marks for loading, when they were annealed.

It is a bit more trouble to keep boxes of brass separated during cleaning, but if I'm mixing boxes in the tumbler, I'll mark the primers of one box with a carbide scribe so that I can separate them after tumbling.

I have 4 rifles in 38-55.  One uses W-W brass, one uses long Starline, and two use short Starline. For the two with distinct brass, separating is simply by sorting headstamps.

If you do have any W-W brass, you might reserve it for one rifle and use reformed Starline 38-55 for the other. If not, a little more initial expense for the long brass, but reform short Starline for one rifle and long for the other (trimmed to the appropriate length of course).

In one of my books, there is a formula, to turn brass black. You could dip the heads in that and it should make it possible to keep them seperate.

If you like, I'll look the formula up.

Frank

I mark any I want marked by a file notch on the edge of the rim. More than one if necessary.

Notching the rims works for identification - also works for indexing the cases in the chamber

I have marked my Brass to identify the actual Rifle. 
1) T stamped on the base for my Takedown Hiwall 32-40
2) 4 for my first Number 4 Barrel Hiwall 38-55
3) 3 for my 32-40 #3 barrel Hiwall
4) P for my Pope Hiwall 
5) H for my Home Talent Hiwall 32-40.

And so on, It does not have to be stamped heavy the Brass takes the stamp easily. The ID can be used for orientation also
if it is wished. HTH Regards FITZ.

I keep a wooden block drilled for the case needed for the gun with 12 holes in it. I keep a dozen cases for the gun in the shooting kit for each gun.
If your one of those guys who lands up a couple of hundred at home just mark the box with a lable maker.

40 Rod

I only have one 32-20 CPA, but two different lots (match years) of Starline brass, segregated by one and two notches in the rim.  the notches make it easier to index them in the wet tumbler as well....