get a light, and 10 or 20 rounds mag to keep in it, if you shoot a man with a high capacity rife you will get heat. of course makes no sence as people have glocks with 31 rounders by the bed in many homes. but they would have no issue in court.
i personally have a 12 guage loaded. and a .308 bolt for any threats man or four legged that may appear further away and by man i mean someone shooting in my direction from a larger distance. and my dad has an ar15 but it stays unloaded. because there are people in the house he uses hollowpoint .357 magnum rounds. reconsider your situation. because i rifle, unless you have frangible rounds.. will go through things.