How many layers of this Thermos will a .22LR penetrate?

http://i.imgur.com/kRFLFNq.jpg

Dropped this on concrete a while back which dented the bottom and broke the sealing valve. Might as well use it for a target :)

My guess is 2, maybe 2.5 layers. CCI MiniMag copper coated solid points (~1200fps) shot through a Ruger 22/45.