Some factories use a product called "Black Lucas" in the neck to prevent cold welding(fusion).
I lived out West for 30 years never had cold welding. I moved back South, and I have seen cold welding on my own ammo twice. Moisture maybe a factor.
On hunting ammo that I want to load 100 of, I barely seat the bullets in the case, and when time comes, I measure OAL to kiss the lands(or what ever bullet jump that the barrel/bullet likes best), seat the bullets. This seems to be a good system.
