Turehu
What Lube are you using?
Is the decapping pin/neck sizer set deep enough?
If it is not set deep enough then you may get the results you have described.
I also lube the inside of the neck with a cotton wool bud rolled over the lube pad a couple of times.
Also the Lee shell holders can sometimes be a bit loose.
You may want to try an RCBS shell holder to eliminate this as a cause.
Let us know how you get on.
Cheers
Pete
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