I havent shot them but a buddy shot a few with the SK2 last year and he had great luck with them. Blood trails were crazy good. Like make rage, grim reaper and spitfire blood trails look weak. That said he did note that deer on avg covered quite a bit more ground before going down than he is accustomed to with the GR's. IIRC, only one made it past 125 yards, most were in the 100 range. He intentionally shot a doe in the shoulder and the head blew through the shoulder blade on entry and through the ball socket on exit and was in close to pristine condition. When I run out of what I am shooting, I intend to pick some up.