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Cold Welding

My sister-in-law does estate sales and gives me any gun related stuff she is not going to sell. Recently recieved 30 rounds of reloaded 30-06 ammo. It was a mixed up bunch of range pickup brass that had Nosler ballistic tip bullets. I decided to pull it down to salvage the bullets. Turns out they were 150 grain bullets. Powder was a stick powder that looked like IMR something. 46.5 to 47.6 grains - yuck! A collet puller was having trouble so I used a seater to move the bullets 0.030 deeper. Then they pulled ok. Discovered the bullets had been crimped, and most bullets came out with a bright shiney brass ring welded to them. Proof that cold welding does happen, and another warning to never shoot someone elses reloads.

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The brass transfer at bottom of bearing surface is most interesting.
Thinking aloud here: What if some genius trimmed cases, deburred, but didn't chamfer them? The boattails would enter the case mouths just fine, and fold back and detach the thin brass flash that should have been chamferred away. The flash would likely be trapped just above the boattail. I would be interested in how easily the brass seen here detaches from the bullet using a #11 Xacto blade to pry it. I.e. is it really "welded"?
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