Interesting. Does it have to be a certain calibur bullet, or will any sniper do?
edit:
hmm, doesn't seem like it matters too much..
(skip to 4:42)
Maybe I'll try playing with mouse-accel off once more. I tried for a little while, but it just felt really unnatural. I wonder if W7 is able to finally turn mouse-accel off properly once you deselect it in the options.