"Does anyone else remember the longest golf drive in history? ... I forget which astranaut did it."
It was Alan Shepherd. He was an avid golfer as well as an astronaut. IIRC, he took a shortened shaft 5 iron. I doubt the ball went miles and miles. On earth he would have been lucky to get 100 yards out of the shot due to the club he used and the space suit hendering his swing. Maybe he got 600 to 700 yards out of it, but if it hit rock on the way down, he probably got some good distance from the bounce.
For the bullet in space question, it's been answered well. Even in intergalactic space (the emptiest space there is), there are several atoms per cubic meter (usually hydrogen). It would go a long, long distance - many light years distance probably, and many millions of actual years, but it would eventually stop. However, even the term "stop" is relative in space. Stopped in relation to what? Even before the bullet was fired it was traveling at a tremendous speed relative to the sun, for example.