I assume you are referring to the "Lee Factory Crimp Die". It can be helpful to have. I use it on my 308 and 30-06 hunting loads. It is a nice assurance that I shouldn't have any problems with my hunting ammo being bounced around and damaged from recoil, etc. Just remember to work up your loads as normal with this die, I wouldn't work up a load and then just start adding a crimp. I am sure that goes with out saying, but just in case. I have noticed that my ammo is usually more consistent when using this on my 308.
I don't use it for everything but it does have its place.
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