In the tie-in of SG-1 and Atlantis, they had to use a ZPM to power the gate, and use an eighth chevron to travel to the Pegasus Galaxy. It was (so I thought) common knowledge that they could only travel to gates within our own galaxy unless they had met those requirements.
Now, I recently rewatched the movie, in which the probe traveled to the Kaliam Galaxy, or as Catherine put it, "the other side of the known universe." So, why the limitation on the TV show? And why were they able to travel back to that planet in the first episodes?
Answer
This seems to be an example of retcon. Whilst in the film the planet Abydos was in the Kaliam Galaxy, in the TV series this was changed, and Abydos was said to be the closest planet to Earth (with a stargate), and therefore in the Milky Way.
I imagine that the reason they changed it for the TV series was so that they could have storylines with the Asgard, the Ori and Atlantis, without the teams being able to travel back and forth at will. This is only speculation though so I'll look into it further.
See Differences from the series.
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