I accidentally won a Gunbroker bid (at a great price) for a Mauser M-96 straight pull in 7mm Rem Mag. It was a nice rifle, but I was in grad school at the time and didn't have the time or inclination to start reloading for another caliber. I wound up selling it to someone who wanted it for elk hunting before I put any rounds down the tube.
Recently I saw a Mauser 98 at a local gun store for a price that I couldn't pass up. After a couple weeks I decided I didn't really have a use for it, and again, didn't want to start reloading for another caliber I didn't have a need for, so I sold it off.
I think those are the only two out of the few dozen that I have owned, that I haven't shot though, the vast majority make it to the range.