A Killhouse IS a live ammunition venue.
They ["I]simulate [/I'] a 360* hostile environment. Facades and props are used for realism and to affect particular circumstances within the artificial environment.
Building construction of interior as well as exterior walls are designed to prevent penetration to the outside or from room to room within the structure.
Early shoothouses were made of stacked tires, while many today have concrete walls faced with plywood or rubber mats with a dead space between. Some places require the use of Frangible ammunition.
To answer your OT, I believe Mid South in Mississippi has a shoothouse, and Blackwater in NC. I don't know of any closer to you.