|Lee's factory crimp dies are simply Phenomenal!! They set up easily, and they only take minimal pressure on the handle of the press to put a 360° crimp on or near the mouth of the brass.
I had purchased some tracer bullets in .308 and .223 from another web site and on both sizes of bullets, the instructions said to put a good strong crimp on the bullet or the tracers may not light. They also mentioned that Lee's FCD was recommended.
FCD??!!?? Well, I knew Cheaper Than Dirt had a great selection of dies and I simply started looking through Lee and found Lee's Factory Crimp Dies (ala FCD).
I tried using a roll crimp prior to using the FCD but in each case (literally, for both the .308 AND the .223) they would either dent, crinkle or mash part of either the neck or shoulder of the brass cases when trying to put a deep crimp on the bullets. FCD to the rescue!!!
The FCD cannot deform brass due to its' construction. THAT is because the cases are not used in anyway to apply pressure for the crimp, as opposed to a roll crimp or even a taper crimp. The case simply sets in the case holder and when pressure is applied, the pressure comes from the actual case holder pushing on the crimp collect within the die itself. The more pressure (or, more correctly, the longer length of the handle stroke) is what determines the depth or deepness of the crimp. By using the case holder to transfer the pressure for the crimp leaves the case to simply "go along for the ride".
And, the price of the factory crimp die about blew me away!!! At the time that I bought the dies, I believe the price was around $8 plus change. SUPER cheap for a FACTORY crimp!!
During the time I used the FCD's for 5.56 NATO and 7.62x39 cases, and seeing how easy they were to use, I also bought one for my 30'06 reloading chores!
I would absolutely recommend having a Lee Factory Crimp Die on hand when loading ANY caliber that uses a tapered shoulder, such as, i.e.; 30'06, 7.62x39, 556 NATO, 7mm Magnum, .243, 22-250, etc., etc., etc.|