Ill be over to diesel some cobras and send arrows thru sheetrock or windows 
I may have christened the wall behind the archery target last week... was aligning the travel on my ascent sight amd sent an arrow over my target.... it now has a 3/4 inch sheet of plywood behind it... jamie wasnt impressed 

How much penetration did you get through your wall? Hopefully it didn't make it all the way through.
My fiancé's grandpa told me yesterday that he built a bullet trap that he tested in his basement. Said he tested it with a .375 H&H in the basement. His basement is about half the size as yours.

Maybe I need to get his bullet trap design and you could expand your indoor archery range to include firearms.

I'm sure Jamie won't mind.