cartridge case concentricity

the wrench

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Does anyone here check and adjust case concentricity? I read an add in a shooting mag about this. A company was selling a tool that would measure concentricity and they said that a case being out .004 in. would cause groups to open up. I would like to hear from anyone who has done this or heard of it.
 
I use a RCBS Case Master to check.

If you don't have good bullets, seated straight, ina concentric casse..All the other tricks aren't going to help, although to be honest I've seen some pretty screwed up ammo shoot pretty well in good barrels.;)

I think concentricity is one of the 3 main factors in accuracy, the other 2 being velocity and seating depth.

Do you need a case guage? Who knows? If your ammo is shooting acceptably accurately, don't bother.:)
 
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