RE: Lee Collet Dies
The Lee Collet Die is just about the best neck die ever invented. But, it is not uncommon for the Collet die to produce very limited neck tension. There is a very common fix and it can be handled two ways. One is to remove the mandrel from the die, chuck it into a dril and polish it down a few thousands with fine emery paper. The other is to call Lee and order a "Reduced" mandrel for you particular cartridge, they cost about $5.