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Are you crimping at the same time you seated the bullets?
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No, dillion taper die next stage.
After loading several hundred more, and doing all kinds of "trouble shooting", I am still at a quandary. To eliminate the seating cone marking with these bullets and FC cases, I have resorted to running the case 2 times into the sizing die so the neck makes contact 4 times with the expander (in and out), and rotate case a little in between cycles, then chamfer the inside of each case, then brush the heck out of the neck. Oh, I also slightly reamed and polished the seating cone. After all that I still get maybe 8 out of 100 that will have a slight ring on them.
It has to be the FC cases have a slightly thicker neck and the Hornady SP's must have a delicate jacket, and my dillion bullet seating cone.
Am going to load the rest in different brass since the 100 that I loaded in LC Brass with out any extraordinary prep came out just fine.