If your talking about the LNL-AP the primer dimple falls right on the edge of the riser of the ram. So you will not be able to drill all the way through, no need to. Nothing wrong with setting a solid steel pin where it hits. You need a stubby drill bit and 90 deg drill to get in there. I used the primer seater body as a guide. I put a SS set screw in so the dimple hits the center of the hex head. Does not even damage the set screw head since it contacts on the outer edge and the hex is recessed.