"Outer Diam" is the inner diameter of your chamber tube.
"Inner Diam" is the outer diameter of your barrel for a coaxial cannon.
If your design is not a coaxial, the "Inner Diam" should be zero.
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Just as a matter of opinion: cam locks all day every day. In a mounted configuration like yours screw breech works well enough, but any usage where the barrel is free to move in any other axis than forward/backwards (and rotating) they become very annoying.