Wow! I've used the Speer plastic bullets out of primed cases in an abandoned office, but NOT for tactical training!!! Like our mommies said, "It is all fun and games until someone loses an eye."
As for dummy ammo, provided one respects the four rules of gun safety, there should be no chance of a deadly accident. That clearly does not, ever, involve tactical training in a home. (Since, in a true tactical situation, you cannot prevent your muzzle from covering exterior walls, doors, or other non-cover concealment materials. Ergo, you cannot be certain your muzzle does not cover something -someone - you are not prepared to destroy.
If you gotta have something in your hand while tactically moving in your home, a plastic toy gun with the blaze orange muzzle would be appropriate.
Dummy rounds are for function testing, not dry practice. Oh, I know, there is the school that says dry practice, including tripping the trigger - see above about four rules - will ruin your gun. Assuming a modern steel centerfire arm, you could be so lucky as to dry practice enough strokes to damage the gun!!