I have been reloading for over 50 years, and have never experienced any sort of cold weld. Some of the loads I have fired are over 8 yrs old. Not saying it can't happen, just hasn't happened to me.I think it depends on brass prep. Once fired, correct neck tension, and a bit of carbon left in the neck (not wet tumbled with steel pins), I have not seen any issues with ammo loaded and stored for years. I have 7RM ammo loaded 6-7 years ago that shoots the same velocity as it did when fresh. Same with 28 Nos, 6.5SLR, .223. Other than that, for a lot of my ammo, 200 rounds just doesn't stay unfired for long enough to notice a difference. But I do rotate the stock. When I reload 100-200 pieces, they go to the bottom of the stack.
New brass may be a different story. But again...Hard to keep from shooting new brass loads. I want to get them formed to my chamber as soon as possible.
Never use steel pins to clean, just burnish fired brass necks with stiff nylon brush on cordless. If virgin brass dip neck in liquid graphite (blaster at Napa).
Try liquid - no dust less mess more consistant.Maybe this is one of reasons……along with "dumb luck", that I've never, to my knowledge, experienced cold weld.
For many (many) years I've used powder graphite inside my case necks when reloading…….not just on new brass……but every time!
It's messy, but seems to help with a multitude of issues…..more consistent pressure required when sizing (expansion plug withdrawal), bullet seating and fairly low velocity spreads when shot across a chrono. Plus, knock on wood, no cold welds……yet! memtb
Sealant in the necks was used long before my time and continues, but when they passed me the torch they indoctrinated me into their world.How do you know that about sealants? This always comes up when mentioning milsurp.