" ... when a sharp edge of the case mouth came up and caught their finger ... "
Guilty - coupla times. No skin lose but there's this funny bio-feedback thing that says "Hey Stupid! Whatever you're doing that hurts so much - quit it!" Even with no brass & you "just" catch your finger with the ram, it'll make you wonder why you do things like that.
Impressive crushing power with a press. Got myself a D550 now & can crush more fingers faster ....