You can figure it out with feeler gauges. Your A,B measurements need to be made at the firing pin..
A: You need the distance between the frame and the heel of a .45acp when in the cylinder.
B: You need the distance from the cylinder to the frame with no case.
C: you need the thickness of a .45ar rim.
B-A=?
C-?= the amount you need to cut off....
Make sense?
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