Some people will go to any length to prove that a myth is or isn’t true. Here is an example of a man that wanted to prove that shooting a .50 cal from inside wouldn’t shatter windows/glass. For more entertainment, read the comments in the video.
Oh, and he does state that he has range in his yard that he is shooting into, also.
Should you be interested in purchasing your own .50 cal, here is some information from Pew Pew Tactical on a few different types of .50 cals that could help you find a place to start: https://www.pewpewtactical.com/best-50-caliber-cartridges-guns/