Is it possible to anneal pistol brass? Not the kind of pistol round that resembles a rifle round like the larger calibers, I mean like 9mm and shorter brass.

I ask because I recently scored some once fired 9mm Federal brass at my local range. When I got home & started to process it, I found it was VERY brittle. Brittle as in approximately 1/3 of it had cracks near the case mouth. A few more had cracked when I ran it thru the sizing die. I ended up tossing the whole lot in the scrap bucket.
I even pinched one with a pliers and it cracked with very little pressure. I've never encountered anything like this before.

I recall reading / hearing about annealing pistol brass unfortunately, I don't recall the particulars. (Middle age disease called CRS.... I'm sure y'all understand)... Anyone have anything on this?

Thanks - Frank in Fla