A 1-0 win over Shrewsbury at Wembley last weekend took the Gills back to League One, but Scally is already targeting another promotion back to the Championship, where the Kent club were from 2000 until 2005.
He said: "It's not a league anyone wants to be in really because it's horrible with some of the games we have to play, there's virtually no money in it and it's a struggle to make ends meet.
"The fans still expect to see Championship football and there's a lot of teams that just bang the ball up. It never touches the grass half of the time so it's difficult for us to compete in this division.
"I think the club could be quite comfortable in the Championship and that's where we want to try and get to.
"I think we can sustain Championship football and if we do get there we'll have a better chance of staying there than we did last time we got there."