Anyone ever have Lee make them a custom collet die? In order to do this they want 2 1xfired cases and a couple of bullets. When the make a custom collet die they also provide a dead length seater. I guess they need the bullets to set the seater up? I was planning on getting a set made for a 7 saum that has a factory barrel/chamber. Do I run the risk of producing a die that will not work properly if I eventually go to a custom barrel with a tight neck chamber?