I learned how to use mine in the living room. I stacked up a row of books, loaded it, pulled back the sliding thingy and shot off 15 rounds. The books were toast. I tried that with my .270 rifle also. ... unfortunately the bullet went through ALL the books (several big thick text books), through the house, outside into some undisclosed location... Lesson learned? Only shoot pistols in the house. Also... Rifles are crazy strong!