run-out tools?

[oldbluelight]

I use the RCBS Casemaster and check runout on the front driving band. It does not provide a means of correcting excessive runout. Anything over .003" is sorted into the fouling shot section of the ammo box. Variations in wall thickness at the neck can make runout a constant problem. The RCBS tool can measure neck thickness and tell you if you need to turn the necks make your loads more consistant. It will also check for incipient case separation. With an accessory I've even used it to sort 22lr by rim thickness.