there are three main causes, Greyhud has one mentioned
Most common is setting up your FL die to touch the shell holder then not winding it down further to counteract press stretch, fix+ wind the die down further.
then there in the extractor pin/ expander ball rod is set to low stopping the case going to the shell holder fully
When FL sizing the case gets squashed in on the sides pushing the shoulder forward...the shoulder gets bumped back at the end of the stroke so that is the part that needs to be set right....
If plenty of lube on the neck and the center rod is not too low just wind the die down 1/8 at a time until the bolt closes with no friction or just the slightest bit of friction
Oh and the other thing to check....you pill is not to far out is it so it is jamming in the lands?
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