Miller, that is the only thing I could compare and explain what I had to do, and yes it would be for the head (rim)of the shell. That dimension has to be a standard size, I believe .075-.080 deep. The "rims" I have measured were .072-.074. Using a depth mike I found the shell to be .005-.008 recessed.
The "land" between the ejectors has to be machined out also, not so big a deal using a 3/8" end mill, the hardest part will be to index and clamp it.
Jim,
I wasn't sure what they were referring to. You explained it a lot better than me looking at it and figuring what the ring was for. What made me think it was the right tool was the 55 degree chamfer for the rim.
I'm guessing this then would cut it oversize to allow the ring to fit the chamber, and then like you said, re-cut the ring to the correct depth.
I don't have catalog #62, but looked up under reamers. Is this the one you were talking about, 184-052-729 $160.00. This reamer is for bore size .729, and I didn't see any for .890, rim size.
Bill Meyer, is your tool like the Brownell one? If so than the .890 O.D. would be the right size. Does it have a pilot to follow the chamber and what size is that.
You guys are great with information and knowledge.
