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Gunsmithing Maybe a dumb question about re-reaming a barrel?

GNCC407

Private
Minuteman
Feb 12, 2019
89
13
Strasburg, OH
My 6mm is throated for 105 Hybrids. I have a .105 freebore. I would like to try 110 SMK's or 115 DTACs. My current freebore drives the bullet past neck shoulder junction at lands. I have a reamer with a .160 freebore. Can I run that reamer by hand on a barrel that has approx 600 rounds shot out of it?
 
Yes.

Make sure you use a snug fitting pilot and an effective stop of some kind. It's waaay to easy to go a few thou too far without a rock-solid stop.
Setup is going to depend on whether you're going to do this with the barrel on (through the receiver with a t-handle ) or barrel off?