Ok…. Let me rephrase what I asked. I get all of that. I've never been around a 20gt. I have no idea the case capacity. Or anything else about one for that matter. So instead of looking it up I figured I'd ask here and get a rough idea on velocity difference if there is any. I know all of that comes into play. Im not asking for exact numbersLots of variables come into play here… powder used, internal dimensions of the brass, seating depth, barrel actual bore size…