05-12-2020, 02:11 PM
I have similar primer pocket "uniforming" cutters for small and large primer sizes. They are sized to closely fit the primer pocket. They cut a nice flat bottom with sharp corners to a uniform depth. I used to shoot a lot of Lake City brass which varied a bit in primer pocket "quality". The pockets are formed by a punch process which works, but isn't exactly what you would call precision machining. Many of them have a slight radius in the corners of the pockets from the punches and so the primer cups don't seat completely to the bottom flat. However I have not ever tried to use them to bore an oversize primer pocket in a standard brass case before and certainly not with a spent primer in place. Just spitballing an idea here.
Regarding decapping Berdan cases - you can either use a small sharp punch and a hammer to pierce the primer cup and pry it out - or use a hand tool made specifically for the task https://www.amazon.com/RCBS-9525-Berdan-...B0002INRT6
The cheap (but messy) way to remove them is to get a round piece of bar that closely fits the inside of the case mouth. Drill a hole in a block of wood slightly larger than primer pocket. Set the case on the block of wood with the primer over the hole. Fill the case completely with water. Insert the rod into the case mouth and give it a good whack with a hammer. Primer exits the case...
Regarding decapping Berdan cases - you can either use a small sharp punch and a hammer to pierce the primer cup and pry it out - or use a hand tool made specifically for the task https://www.amazon.com/RCBS-9525-Berdan-...B0002INRT6
The cheap (but messy) way to remove them is to get a round piece of bar that closely fits the inside of the case mouth. Drill a hole in a block of wood slightly larger than primer pocket. Set the case on the block of wood with the primer over the hole. Fill the case completely with water. Insert the rod into the case mouth and give it a good whack with a hammer. Primer exits the case...
Willie