Well back to the subject.
I know my smith uses a mixed collection of reamers makers but I remember him saying my final head spacing for the WSM and 260 were JGS rather than PTG.
My 300 WSM
is well sub MOA on JGS finish reamer into a Pac-Nor prefit.
My 260 REM has shot an 8x in a 2x20@1000 at a very wind driven match, same.
My just completed but not tuned 338 Edge went sub MOA on shots 4,5 and 6 with a PTG into a Benchmark barrel. I thought I had a thead on this but I'll get pictures today.
Next chamber, going to smith next week, is a custom 300 Wby I want opened to 300 RUM. That reamer, owned by the smith is older so not subject to the quality issues of recent times.
The latest chambering, the 338/26 Nosler. With a very recent PTG reamer. So we will see how it goes. I have a resize reamer to match.