While I certainly don't recommend the practice, there have been times when I've loaded pointy bullets in the .30-30, but I've used those as single shots, nothing in the magazine tube. I don't think it's a good idea to tempt fate, because Murphy seems to appear at totally inconvenient times.
However, there have been guys who tested the idea, with some interesting results. Once such thread, with pics, can be found over at the Leverguns forums.
LINKY! Interesting stuff there, although again, I don't recommend the practice.