Umm..
I think I'll just settle for using the silenced .22 on the rats then..
Once upon a time I was a Class III Federal Firearms Dealer. A silenced pistol gets louder with each shot as the internal elements heat and the wiper wears. About 2 really quiet shots is all you get at one time. A small bore rifle with a large silencer might get off 10 rounds before it is time to let it cool down.
SO9