Commercially, the better established reamer makers supply in a myriad of size range. The normal increment is by .001, with additional spread + & - .0002, and the more common .0005 under. Adding metric choices to that, about any size will be OTC.
Make sure to invest or build floating reamer holders. Diameters you mention are target and precision shooting calibers, one holder might cover them. Reamer shank sizes are standardized among different cutter diameters. An ideal throat reaming would float a full length shank, helical flutes; right hand twist with left hand cut. As they don't self feed, occurrence of chatter will be VERY low. Barrel steels are high machinability but soft, differing from more tolerant annealed tool steels. Another trick would have the reamer front ground to land diameter and re-chamfer setback cutting edges.
I recommend investment also in Deltronic type incremental gauge pins. They differ from common gauge pin sets [choice is over .0002- - - under .0002] supplied in .001 increments. Deltronic and the others are a tray of size needed in .0001 increments. Use a carbide faced micrometer in .0001 to measure a sampling of bullets, and compare to exact match Deltronic. Near perfection would use an Indicating or Bench Micrometer, and many times faster.
BTW. In sixth grade, class was tasked book reports from a biography. We used school library, normal kids went straight to historic identities; Washington, Lincoln, Pasteur, Edison etc. Very linear, I started with "A"; remember passing up Abigail Adams, with a 'nahh'.
One row later, J.M.Browning was in my hand. Firearms were already interesting, but his abilities, ultimate Toolmaker, bowled me over. Shortly thereafter, when asked about career ideas, when same normal kids reply doctor, policeman, fireman, pilot....lol none ever say insurance agent or lawyer. I said loudly, 'Machinist', only because term Toolmaker was yet unknown to me.
Occurs to me right now, wishing someone made a list, might have been the only one focused on a trade.
But while they're sitting now to watch "How It's Made", WE already know.
