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Guy,
I agree with Bill. When you crimp and seat at the same time. Two things are happening at once. You are still pushing the bullet in the case while the crimp is being formed. This at times will start to roll the case mouth and create a bulge in that area. It's like trying to lock the bullet in with the crimp and push the bullet in deeper at the the same time. Not a good combination. With a softer bullet the problem becomes worse because the edge of the case mouth digs into the side of the bullet easier rather than slipping a little on a bullet jacket.
Regards
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