It is my understanding that brass coming from a semi-auto is always hotter. The reason the brass even gets hot is not from the powder burn (that does make it warm, however). The heat is from the friction of being ripped from the chamber during extraction.
Once the round is fired, the brass is swelled slightly to take the shape of the chamber (which is why reloading involves "re-sizing" the brass). So, the brass is now very tight against the chamber walls, and then it gets ripped out with great speed during extraction.
Same reason that your barrel gets hot. It's from the friction of the bullet traveling through it at 3,000 FPS.
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Evey -- Are you like a...crazy person?
V -- I'm quite sure they will say so.
"Two things are infinite: the universe and human stupidity. And, I'm not sure about the universe" -- Einstein
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