Case stretching is a normal occurrence to all cases upon firing. As the pressures in the case reach maximum the brass is forced outward until it contacts the chamber walls, once in contact with the walls the brass has only one way it can flow and that is forward into the chamber. If the case is then reloaded, the case is again stretched by the reloading die. It is this case stretching that ultimately leads to the need to trim reloaded brass and the reason for the thinning of the brass in the head area.
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