Where's the corner on a corner bead?

[Mike Stelts]

When cutting the 45 on corner beads to mate stiles to rails, I can't find an accurate (and also fast) way to find the corner from my mark on the edge, because there isn't any - it's been rounded off. I'm hoping there's some method I'm not clever enough to figure out on my own.

Does anyone have a shortcut?

corner bead corner.jpg

[Lee Schierer]

I would mark the desired angle on the flat back side and then continue the guide line up the outside edge of the piece.