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Using the Lee collet die has a learning curve, it's NOT a simple "push the case in, pull the case out" thing like other dies. But, once it's learned you won't want to change!
One thing to know for sure is there is a definate, hard limit on how far down you can size the necks. They can't be made any smaller than the mandral allows. Nor do they need to be any smaller; done correctly that die makes necks pretty much the perfect size! Most folks seem to think a high "neck tension" (smaller inside diameter) is somehow better but that's NOT true.
IF you push down too hard on the lever you can strip the threads off the die's top cap and pop it out. It's made to do that to prevent us from damaging the press or another part of the die. Use the prescribed 20# of lever pressure as the directions specify and you will likely be happy.
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