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If you are having difficulty closing the bolt on your re-loads, you might need to bump the shoulder back a little. If you adjust your sizing die to touch the shell holder when you are actually sizing a shell there will be enough backlash/play that when the ram is all the way up, you will have enough room to slip a thick business card between the bottom of your die and the shell holder. The solution is to insert the sizing die even deeper, a little at a time until you can easily close your bolt with a freshly resized shell. Trimming to length is another issue.