I've always kept meticulous records on reloaded brass. I anneal every 4 reloads. I tend to load on the "hot" side. I can safely and definitively state, "IT VARIES!"
Belted brass I can't get over 12-13 reloads before I start getting separation signs, but normally at 10 I'm very cautious. Other cartridges, non-belted, I've gone as much as low 20's on reloads before the primer pockets expand. However, I have one batch of old military '06 brass with just over 40 reloads. They could be used in a pinch but the primer pockets are getting to where you can almost seat the primers with your fingers.
