Even a 2 LR has penetrating power, hypothetically four or more interior walls. Many times that for a more powerful weapon.
https://www.youtube.com/watch?v=1pSVn7ozXTQ
In Canada if an intruder instantly gave up when confronted and the police called who would get hammered worse, the intruder or the defender?
Intruder would get hit with break and enter.
However would the cops be over zealous with gun charges against the defender? It has happened.
Would such charges result in the revoking of a restricted firearm permit?
What would be the most compact weapon available that would avoid the restricted clause?
Fun story. (Takes place in West Toronto)
Uncle (who is a collector) bought a new handgun from a private seller and was admiring it in the car on the way home while his brother drove.
Someone spotted him looking at it while they were at a red light and called the cops. 10 seconds after he pulled into his home he was swarmed by 9 police vehicles, guns drawn, screaming at him to kiss the dirt.
He was charged with improper storage and transportation of a firearm (if i recall correctly). Upon conviction he was given a 10 year ban from owning a licence and had to give his collection away.
Point is, yeah; It can go sideways very quickly for you here when you don't follow the laws in place and someone puts five-oh onto you.