Nielson Bros Rimfire Concentricity Gauge

[Gjmen22]

Anyone ever play around with one of these? What were your results?

http://nielsonbrothersarms.com/Rimfire.htm

Gjmen22

 

[grauhanen]

I asked about availability in the spring of 2020. I was told that they were no longer available.
I was able to try one out that belonged to a fellow shooter. I sorted a few hundred rounds but could find no reason to think they made a significant difference.

 

[Tim7139]

When they first came I had lots of conversations with Tony Nielson.....bought one and after a while got to the point where shooting high grade ammo in a match chamber......sold it.