Quote:
I have to lightly force it in, reshaping the lead
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Can you show a picture of how the lead is reshaped? It makes a difference if the lead is in contact with the lands, or the bullet is contacting the end of the chamber.
As others have mentioned, it is normal for material to accumulate in your seating die when loading lead.
-If it is mostly lead, you may not be flaring your case enough. How have you set your flare? Using a measurement to determine the amount of flare and closing the flare with a taper crimp die can eliminate problems.
-If it is mostly lube that is just part of loading lead and after 250 rounds it would be normal to clean it out.
Dillon seating dies actually use a plug so you can pull the bullet seating assembly without affecting the depth setting adjustment.