Rebel,
Actually, I have this old military in the 6.5, along with a modern action Savage that I wrenched together in 6.5 with a Shilen barrel.
It's not difficult to keep the brass separate as I shoot only Lapua brass from my Savage. If I shoot RP from it, I may get 3 rounds at most. My Savage will push a Berger 140gr. a tad above 2800fps with no pressure signs, and as long as I use quality components, I will get about 10 to 12 reloads from the brass before it's time to "retire" it.
And since I load Lapua brass for the Savage, and either Berger or Barnes bullets, it's easy to keep track of the bullets as the Hornady's all have the red rubber tip on 'em!!
Also, I have a Redding body die with two "hash marks" on it. One for the military....and one for the Savage.
You raise all valid points and I thank you for pointing that out. I just wanted to post this and let any reader know it's possible to keep it separate. I think it would get a lot more difficult though....if you were loading the same bullets, or if the bullets looked alike.
DAve