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« on: March 17, 2021, 03:26:11 pm »
From what I could gather off of the net, the extractor groove for a .45Lc is .450". The extractor groove for a .45acp is only .394".
So it is looking more like to be a .45Lc shell plate.
The die has those funny 2 lines cut into it with what I think is a die grinder or cut off wheel not a cold chisel. Somebody put them there to identify something.
I think you will need to use a resized case or a new cartridge to see how they fit into the sizing die. The fired case will expand a few or several thousands of an inch and throw off your findings.
Let us know what you find.
Later,