^^^ this, and also why I chose to take up reloading in the first place. I know I said I was finished with this debate, but I couldn't resist taking a glance to see what else has been said.
Reloading is, for many of us, a process by which to customize our ammo for a given firearm, not for every firearm, or any other firearm. And when performed properly with this specific purpose in mind, the results are almost always astounding, and have been for me for 30+ years.
Barnes bullets that spin in the case mouth are probably due to excessive crimp being applied, something I never do with a bottle neck cartridge unless it's for a tubular magazine, an elephant gun, or a MG. It seems that many new reloaders that see a canelure, or what appears to be a canelure, automatically assume it must be crimped. So it's my guess, and I contend, that if the spinning Barnes bullets were factory cartridges, the manufacturer didn't have the tooling adjusted correctly for a solid, and to much crimp was applied. However, this same issue can present with a cup & core bullet when over crimped.
GS