RufusG what is the biggest room in your home? I would think that will give you the distance at which it needs to be able to get the job done at.
I've got a couple places in the house with an open line of sight over 60 or 70 feet, although most likely shots would be shorter. If I get to count the garage, it would be longer. But I also don't assume I wouldn't have to step outside under some scenario.
I've decided I'm going to do some controlled "short range" patterning when it cools down a bit. I've only patterned at say 20-40 yards before.
