What bullet?
Based on your statement that you have been loading the same load for years, I was first assuming that nothing had changed, except for the leaks. If you have changed primers (even just lot #) or powder lot #, then there is some chance that you are getting over-pressure. Also, changing bullets, not just weight, but also construction type, say going from Sierra to Nosler or Barns. By the way, you did not mention what bullet you are loading.
SL1
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