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I had a similar experience with 5.7 grains of Unique and 125 Gr. semi JHP. I got a bullet stuck in the barrel and had to drive it out. It was a six inch vintage M&P. I am pretty sure it was a crimp issue. I rolled the crimp in a little more firmly and have had no more problems. The bullet was leaving before allowing the pressure to build properly in the case. At least that was what I came up with. Crimp a little tighter and try it again. Makes you nervous though for a little while. The thoughts of sending a bullet into one already stuck in the barrel is not pleasant.
Good luck and post a follow up on your findings.
EKA
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