Re: Bersin Concentricity Tool
Your right XP,Ive never used one.I first saw them advertised by Kinnemans and thought it would be a neat tool but then started thinking that a piece of fired brass is going to be as straight (uniform with the chamber) as its ever going to be from fireforming with the exception of wall thickness in the body,neck etc.
So with all things copasetic with a fireformed case that is being reloaded,ideally the variance in neck thickness is the only thing left to screw with bullet runout (aside from reloading practices that arent quite right...misadjusted dies etc.)
Then I thought how is a Bersin going to true a bullet to be in the centerline of the bore if the neck wall thickness isnt even.I dont think it can.You may be able to reduce runout where the Bersin is measuring but for every thousandths you push the bullet to reduce run out, the other end of the bullet is increasing in run out.
So in my mind,with prepped fireformed brass and proper loading the Bersin was another concentricity gauge that I didnt need,I already have one.
Is my thinking correct?
The Constitution shall never be construed to prevent the people of the United States who are peaceable citizens from keeping their own arms -Samuel Adams