I have ordered 2 reamers from JGS. On the last one, I had them include a headspace gauge. I did the barrel, and when I checked my brass to the chamber I found out that the HS gauge was too short. So, I recut the chamber. I also called JGS and mentioned that there may be a mistake.
Then I found out that I was wrong again and my brass was once fired (sold to me as virgin).
So, I recut the chamber... again... to the HS gauge.
The rifle works like a charm.
I also called JGS and told them it was my mistake, apologized, and thanked them.
All that to say, JGS for the win. Both barrels I have cut with their reamers are beautiful. They will be my go to until something changes.