Googling "servo 555" turns up a few pages.
http://wolfstone.halloweenhost.com/T..._RCServos.html
About half way down, that one has a circuit that uses a pot to adjust it. I haven't tried that circuit myself, but I did use a 555 to control a servo a few years back. I was looking for specific positions, so I used resistors then a small pot to fine tune it. However, I don't see any reason that you couldn't get the full range.
Oh, and the victors use the same signal as servos.