Yes James! There is that also. You can see that difference when you drop a rim recess reamer like I have from Clymer into the bore. The cutters do not hit evenly on the recess because the chamber end of the barrels is not 90deg to the bore axis. Because of that I have not tried to ream my DH12 recesses. I was/am also very reluctant to modify the recesses just to fit poorly made shells.
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