I was wrong, it's 180gr Gold Dot. Here is the actual email that I received from him.
"I'm using 4.2 grains of 231, Federal small pistol primers, Speer Gold Dot 180
grain JHP bullets, and I'm loading to the maximum overall length of 1.135". If
I go down to 4.0 grains, the action doesn't cycle reliably."
I've heard that Federal primers are softer than other brands. Could this be the cause?
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