Shot my new 357 Evanix Max at 5 spam cans wrapped together with two layers of duck tape I used 85 grain 357 hollow points, they penetrated all 5 cans from 20 feet and entered the 3/4" plywood of my rubber mulch and electricians putty back stop and this is not even close to the most powerful 357's out there but it is a semi auto. Big bores are beast and yes could be used for defense of my RV if required in a non gun friendly state like the one in which I live. Overnight areas are not as safe as one may think. Through I have a multi state carry license only police, politicos, business owners, and criminals can carry in my state and my RV is not a home unless I am connected to utilities in a RV park. I tested the max after airing it up and letting it sit for over a month no air loss I love it. Hopefully it will only ever be used for target practice, My DW loves it because there is little noise and no kick!