Bricks vary tremendously in strength as well. From a mere 1,600 PSI strength to around 15,000 PSI strength.
What is the MPa rating of the Brick?
I did a quick search and found a good reference. It appears the Canadians wanted to know just that question and published the results:
www.claybrick.ca/pdf/cmri_bulletproof_project.pdf
Clay Brick—17.5 MPa
Firearm Direct
.22 Long Rifle -large chip in brick
.223 Remington - large hole in brick
.308 Winchester - large hole in brick
7mm Remington Magnum - large hole in brick
7mm Shooting Times Westerner - through brick to tar paper
.30-06 Springfield - large hole in brick
.375 Holland & Holland - through brick to tar paper
Clay Brick—70 MPa
Firearm
.22 Long Rifle - small chip in brick
.223 Remington - large hole half way through brick
.308 Winchester - large hole in brick
.50 Browning Machine Gun - through wall
Concrete Brick
Firearm Direct
.22 Long Rifle small chip in brick
.223 Remington hole in brick
7mm Remington Magnum large hole in brick
.308 Winchester large hole in brick
.30-06 Springfield large hole in brick