I have an RWS P5 Magnum that I shoot in the family room. I have a perfect 10M down the hall to the end wall of the family room, and if I open up the furnace room door I can go prone (just means I need to spend more $$$ for a nice air rifle). It isn't the cheapest gun to buy, but it shoots great and cheap!
I remember when I was young going to grandpa and grandma's and spending the day shooting. Shot my first rabbit with grandpa's help when I was five, learned how to smoke fox out of dens with gunny sacks, dad and my uncles would nail cig packs to the trees, and we'd sit on the front steps with .22's of all sorts plinking (probably did more to promote smoking in our family than anything else - quick ... light up another one ... we need another target), and when winter came it was bb's in the basement. After three generations of shooters and hunters I don't think there was a window on the home place that hadn't been shot out at some time.
It is amazing how many people want to come down to the family room to see at first then play once they hear I shoot down there.