I've used it as a cleaning jag, before I knew that the modern two-piece rammers may come apart. It's a dandy Sharps cleaning rod, regardless.
Although I'm inclined to believe Curt's testimony that it is noted as a cleaning jag in the period manual, I think this is a case of "if it quacks like a duck." A slotted apparatus fitted on the end of the stick that you're going to use to clean your musket anyway. And it's obvious use is... ?
Pine River Boys, Co I, 7th Wisconsin
"We're... Christians, what read the Bible and foller what it says about lovin' your enemies and carin' for them what despitefully use you -- that is, after you've downed 'em good and hard."
-Si Klegg and His Pard Shorty