I am trying to find any info on making the half reamer type, chambering reamers.

Any Ideas/suggestions where to find this info? I know I have seen it somewhere in a smithing book and can't find it now when I need it.
Thank in advance,
nvreloader

There was a discussion about this a few years ago. Look here: https://forums.accuratereloading.com/eve/forums/a/tpc/f/.../r/43510964#43510964
or
https://forums.accuratereloading.com/eve/forums/a/tpc/f/.../r/71810864#71810864

Rogervich does them on Saubier. Go to the articles section, he did an article. He makes the from drill sock, turns it to the correct demension for the round then mils the reamer in half.