20 caliber build.

Lots of variables come into play here… powder used, internal dimensions of the brass, seating depth, barrel actual bore size…
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 numbers
 
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