I ran into that problem. Had to send three pieces of fired brass to them. They honed the seater die to fit the brass. It was free of charge when I sent them in.Ive got a Wilson 30Br seater and was trying to insert some freshly expanded 6Br cases but they wont go all the way in.
Im wondering if its because I havent turned the necks yet and the donut caused by the expanding using a mandrel.
Is my thinking correct?
Thanks
Resized in a fl die ?
I had mine done by dj. Necks turned also.
I still had to bump shoulders back and size necks.
Dont modify anything until you turn, fl size, and fire. Your die will be perfect once your brass is ready
Most likely the problem is that the case neck is not concentric to the case body anymore. The Wilson seating die is pretty tight so check concentricity by simply rolling the case on a flat surface. If you see the neck precess around the case body axis - this is the problem. Full length sizing with a fairly tight neck bushing and neck expanding with the appropriate sizing mandrel a few cycle should allow you to turn necks and fireform the fist time to mitigate the concentricity issue.
Wilson will modify both your Full Length neck bushing die and seating die to match your fireformed cases (3) for just the shipping charge.