Birchwood's World Of Targets Boomslang AR500 Shooting Gong is used for when it's time to break out the heavy artillery. Resounding gong and noticeable movement at each hit, shots can be heard and seen. Features a .5'' thick and 9.5'' diameter AR500 steel and stable base, includes hanging hardware. The Boomslang is rated for centerfire handguns and centerfire rifles up to, and including, .300 and .338 magnum rifles. Handguns will require a minimum distance of 25 yds.