Without measuring, off the top of my head I can tell you that base measurement is too tight. The brass I have all measures .3115 to .312 just above the extractor grove.
I have a normal shoulder reamer and getting a 35 deg made, they are both .314, fwiw.
I'd get the brass you want to use and send it to the reamer maker of your choice and go from there.
__________________
"I used to wear barrels out fretting over a bunch of things that don't amount to a rats petutie."
|