Interesting video where the author took a bunch of master locks and see if a gun would beable to break it. 22 was a fail, 9mm took a several of shots with no luck. Higher power rifles didn’t do it either (just went thru it…or demolished the lock after a several shorts). Shotguns took 2 shots to do it.
http://sploid.gizmodo.com/how-many-gun-shots-and-what-caliber-of-bullet-does-it-t-1732211381