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  1. Using Mark 7 650 Pro with XL750. CCI 450 Primers are protruding from the bottom of the case and not seating far enough when attempting to reload .223 cases. Primer Depth/Bottom Trim setting is 0. I am performing a calibration with a clear shell plate. The ram upstroke appears to be ok with full upstroke, however, the downstroke i am unsure of, as the bottom of the knuckle does not enter the cut out in the bottom of the frame (see calibration photo). I am using a new motor purchased from Mark 7 two days ago. Anyone had any luck with this?