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I'll take a swing....
1. Cases too long or not resized to fit chamber.
2 Measure the fired cases to compare with SAAMI specs. Case head should be .473. If it's .005 larger, danger.
3. Buy a box of factory cheap WW or Rem @ Wally. Compare primer imprint.
4. Put a nickel between your die and shell holder and tighten down. This will prevent the shoulder from being sized.
5. The resized case should drop into the chamber. If not, trim to 2.005.
6. Unclenick may have some other input.
7. Like stated above, could be head thrust.
You didn't state the type of rifle.
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