I measured the concentricity of a fired piece of brass. At the middle of the neck it is about 1.5-2 thou max variance. I look at the same batch of cases run through my Redding Type S bushing neck sizing die (having used the body die to resize the rest) and the middle of the neck is showing 8.5 thou of variance. The wobble in the neck is very visible to the naked eye. Mid shoulder variance is about 0.6 thou. So I have knocked the necks off-centre. What am I doing wrong and how to fix?
(Forster Coax press. Titanium nitride bushings. No lube.)
(Forster Coax press. Titanium nitride bushings. No lube.)