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Low pressure of the plinking loads did not expand the brass to fully seal the chamber. Smoking is due to gas leakage. Lopsided because the case is laying in the bottom of the chamber.
Light loads can set the shoulder back. If you are seeing any fired primer protrusion that is where it is coming from. Keep those cases for light loads only.
Seating lead bullets calls for case mouth flare, best done with the Lyman "M" die. Doubly important if those bullets are plain base, not gas checked.
Why are you crimping .308? I can't see any benefit except for a machine gun.
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