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Welcome to the forum.
I load for my 300 WSM and the WSM cases need to be sized a little differently. You will need to adjust your sizing die so there isn't a gap between the shell holder and the sizing die when the ram is fully extended with a case in the shell holder. Sometimes the cases still won't be sized enough to chamber, and you can either remove a few thousandths from the bottom of the sizing die or from the top of the shell holder. I ground 0.007" off the top of my shell holder as it is easier and cheaper to replace than a sizing die.
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