Look at the primer. If the primer is flattend your hot. If the primer has been flattened to the point it has totally filled the primer pocket ( squared edges) your too hot. if the primer strike hole looks like a crater, a raised edge around the primer indentation. your too hot. on the case if you see a bright ring around the case where the head meets the case body your way too hot. in a bolt gun if it's hard to move the bolt your too hot. If you see powder burns around the the primer pocket your too hot.
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