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Looks like a press to seat bullets using a wilson seater die. Instead of a regular arbor press, it looks like you put the die under the anvil and drive the plunger down on the die by hitting the large diameter disk on the top of the ram with a mallot. That is my best guess.
http://youtu.be/zn4vlNvEYOM Look at the process at about 1:09 if I have confused anyone. Turbo |

