I got shot by a gun who was chronoed at 560fps wtih .25s, and an unchronoed Co2 pistol. Can you guess which shot is which?

That bloody one is from the Co2 pistol 20ft away (and that's punching through my shirt, by the way). The red mark to the bottom right, just under the middle of the picture, is from a gun shooting at the bleeding edge of the fps limits from 150ft away. This is both the reason why you must chrono your pistols, and why we have MEDs.
Just be aware, when you or your plans play with a gun that they don't know what the fps is on it, they can really hurt someone.