Man I wish there were Rock chucks near where I live. I've shot 3, two in ID, one was with a 22rf at 70Y, one at 250Y with a 17Rem, and one in WY at 412Y with a 20x47L wildcat/55's at 3830 fps, all while on vacation. The one at 412Y was hit with such force it went helicoptering off the tippy...