Greetings again.,
Touching the shell holder is not the same as hard down on it. There is spring in all the linkages that will result in an undersized case as I found out over 40 years ago. The measurement of a case fired in your rifle will tell us the next step. It sounds as though your rifle could have a tight chamber which is a good thing.
GPM.
PS. My experience around 1980 was that some cases that I thought I had FL sized chambered well, some hard and some not at all. The fact as I understand it that you have some cases in the batch that you have resized that are OK and some that don't chamber. This tells me that your kit is OK but your technique needs work. Please do NOT go grinding anything as your kit sounds fine. It is just a matter of getting it adjusted properly. I assume that you are using a decent case lube.
GPM.
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