I can see where the target style 11 degree crown has to be indicated BUT a barrel that is spun in a lathe can be crowned with a Remington style recess without indicating.
Using the cross feed the tool bit will pass across the end of the barrel at a 90 degree angle and will impart a perfect crown. No polishing or other work required. This will work even if the barrel is in the headstock chuck with some runout. Just saying....
