Yeah, 600 is just dangerous. I mean 400 can hurt like a **** from 150 feet out if you get hit right. I think if your gonna use a 600 FPS sniper rifle, your engagement distance should be at least 250. If you think that is to far, I hit a coke can dead on with the iront sights of my M4 from 220 today. It's only shooting 380 with .2's.