I don't know if anyone has ever tried this. I was in a pinch about six weeks ago, wanted to bottle condition one beer, as I was kegging the rest. I typically will mail my brother or in-laws some beer every now and then, that's the reason. Anyways, I had my bomber full when I started racking into the keg, realizing I had no new bottle caps. Long story short, I ended having, of all things, a Russian River cap from an old Pliny. Even used, it was in good repair, not bent too much, so I figured I'd try it. But, as I was worried about it not holding pressure, I decided to keep it for myself...
Flash forward, to today.
Well, that did the trick! Not that I'm going to start reusing all my bottle caps, but in a pinch it does work. Also, I primed a 22 oz bottle with (1) 5 gram packet of sugar in the raw. Works every time!