math teacher, Lot of match shooters own their own reamers Here something on the Palma reamers
Here is one on Tony Boyers reamers for the 6ppc
I had 4 reamers and gauges for the 6ppc sold two still have 2 plus I own other reamers/gauges. I've got few rifles had both chambers cut from same reamer and throated the same.
Lots of ways to do things