Deformed Case Head. Comes with a donut. Neck starts getting thicker about 1/2 way towards shoulder. Can be as much as .0015" difference. Outside Neck Turning should fix it. Then will load with Redding FL Type S bushing die. More shooting/More testing. A good thing.
1 Hornady factory unturned brass will not hold a bullet after sizing with my .289" bushing. The neck walls are to thin. The other 19 brass provide .002" neck tension.
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