I have some powder trough tubes for my Dillon powder "kits 'n plates" in .308, 30-06, and .223.
Pretty rare, huh?
Pistol powder through die parts in 9mm, 40 S&W and 45 ACP. Again, pure esoteria.

Do any of my fellow board members have recommendations for specific reamers for smoothing the powder's path from top to bottom?

The rifle powder through dies are of the most interest to me, but all are of use.

Thank you

Have you though of running the piece through a "Vibra-Hone" case polisher? With the right media these vibrating case polishers can do a number on small burrs and rough finishes.

http://www.vibrafinish.com/vib...y-equipment-fsv.html

http://www.vibrafinish.com/media-finishing-info.html

I will have to stick the fiber optic light down in there again. IIRC there is a shelf inside the tube most of the way down.

I will also look into tiny "french cut" ceramic cutting and polishing media.

I also remember "Rusty Stud" on a bench rest forum talk about the subject.

Maybe I will ream a smooth transition from end to end and then vibra hone it to a mirror finish.

Ya, ve vill teach die Dillon to feed, and smoothly to.