I have 31 reloadings on my Lapua and Norma brass in my 338lm.
They seem to last forever. I anneal everytime I reload them, and my chamer is super tight, leaving very little play on the brass, I guess that helps.
300 grs OTM and SMK are my favourite bullets. They shoot well, and fly good. I will take the OTM's out to 3000 meters on friday.