Take your time and keep at it. I had a problem that drove me nuts with my 223 rounds. I was using RCBS dies and a Lee shell holder. Turned out that this combination does not work. After a lot of trial and a lot of error, I got an RCBS shell holder and all was fine.
The 223 cases are so small that there is little room for error in the loaded rounds. Try using a proven set up and keep at it..... and don't forget to get that case gauge.
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