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Yeah, it was rock hard. I hit it with an alumina stone in the Dremel. I did both the top and bottom. My press binds occasionally because the primer seater catches the bottom edge of the primer hole on its way in. I'm hoping that's solved now as well. I took off very little. Just enough that I could see fresh metal and the slight chamfer.
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Great machines!!
I have several Ammomaster units. And a few Piggyback units. I also have a NIB piggyback unit i picked up several years ago. PM me if anyone looking for one.