Only 5 months into reloading strictly 16ga 2.5” shells and a bit north of 1000 now I have had this problem many times. I fix it by adjusting the final crimp pressure. I also have had to readjust slightly between batches. I feel it was a matter of how many reloads the shells have had and certainly between RST and Herters as well as between 8 and 7.5 shot.
Let’s just say I keep a good eye on the wear abouts of my allan key.
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