I just finished fire forming 125 40-65 W/W cases form my Browning bpcr, I plan on dedicating these just for the longer chamber Browning, how would you mark these cases so I can tell them apart from my other cases, seeing that I have 4 40-65's in the safe and I like to shoot them all.
This is going to be my dedicated silhouette gun for the year. 
Is there anything that I can put on the base of the case to permanently mark it.  I don't think I want to file notches in the base. 
Any ideas otherwise. 

thanks VAN 

I already have some WW cases filed with a notch and I'd have to bag those or file two notches.  The  other WW cases that are notched are shorter like 2.10 like the book suggest, but "Dan T. the Man" says that the Browning chambers are like 2.125 and after looking into it I believe that to be true, so I bought new WW 45-70 cases and formed them, then fire formed them with some older BP and after the fire forming the cases did shorten to about 2.130 so I just cleaned up the end to 2.125.  Hoping that this will do.   
Guess that I could use a Magic Marker but that would come off when polishing them.  All my cases are polished to new condition otherwise so maybe I'll just leave them BROWN, like the old guys did.
 
thanks again,  VAN

Van, I have identified brass for specific rifles by stamping the base with a letter character that identifies specific rifles. For instance, I have a 32-40 I built. I call that my "Home Talent Rifle) thus brass for it has an 
(H) stamped. Have a 32-40 Takedown, Its brass is stamped (T). Have a Pope 38-55, Its brass is stamped (P). and so on and so forth. For most of us our rifles have some specific characteristic we can and do identify. So just stamp the brass with the first letter of the characteristic letter. I use 1/16" high letters. I use a steel sleeve that stands up nicely and a SMALL brass hammer so I don't do any damage to the brass. A light tap will strike the letter well enough so that tumbling will not remove it or make it unreadable. I have brass that has been in use for 20 years stamped in this manner and it is still quite clear and obvious. HTH, Regards. FITZ.

thanks for the help.........
van