Rotate video 360 degrees

I would like to take a video of a symbol I have and have it rotate around clockwise 360 degrees.

I have looked in the rotate/sheer settings and I see keyframeable rotation available. I set my keyframes (one at beginning of video, One at end) and set the x rotation to max (1800) and it only rotates 180 degrees. So, Im doing something pretty wrong here. I have looked thru the sparse documentation and have found nothing on this. I guess I dont understand. Would be nice to know how to do this???

If someone knows could you please fill me in or show me where to find the answer? I dont see anything on google either.

thanks,

northpoint