Check the die
I use only Lee products and I have loaded a lot of 223 rounds and never had this problem. Something sounds like it might be "hanging up" in your die. Try taking it out and looking in it. My guns like the rounds to be 2.20. I accidentally sat some bullets shorter than that, around 2.16, which my guns didn't like, accuracy was horrible.
If not, I would contact Lee as they have always given me great customer service when needed.
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