For a similar issue with a 243W rifle and using Redding dies I sorted it by grinding the surface of a spare shell holder to get the case just that wee bit further into the FL die. Maybe only 0.5mm taken off ( I didn't measure it ). Much easier than shortening a FL die, and much cheaper if it turned into a F***up. As others said above, also most important to lube sufficiently, both exterior case and inside neck.
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