Re: WTB concentricity guage ?
Sinclair is the best IMO, but dents under he shoulder in your cases can be a pain and give false runout readings. Dents don't read as easy in the RCBS because the cases rides on a v block, and not ball bearings. Returned my RCBS for th sinclair though. I also upped my dial gauge to a 10 thousandths gauge so I dont have to burn my eyeballs out trying to tell the difference between 1 or 2 thou runout. The runout gauge is generally only as good as the dial indicator.
Nielson bros 22LR concentricity gauge is awesome, and they are developing a centerfire version this year. Cant wait to see it.