I'm assuming the exterior siding was wood or something like LP siding which would slow it down a good bit, then assuming it never hit a stud going through all the interior walls. That's still a lot of sheetrock to go through. I'm skeptical.
Had to be a fast/powerful round !
(Steel jacketed or something similar ?? Hard to imagine that projectile going through that many objects and not deforming to the point of stopping )
I can tell you from experience a .38spl will go through 3 walls, enter and exit the wood undersink cabinets and bust the backrest of a solid wood dining room chair.
I believe it. as long as "never hit a stud?". and as 41mag said 'steel jacket' then absolutely!
Guy next door to me in my college dorm was cleaning his 'unloaded' 742 jammaster. A 3006 corelokt came through both sides of the cinder block. Lucky no one was in the back part of my dorm room. I would have thought one side of the block would have stopped it.