Primer pockets open up after the second loading, and sometimes after the first loading with .223 and .308 FC brass, the new stuff. I have to assume its the same with MAG brass. You will know if the brass is junk if the primer pockets open up after one reloading. As such, its not worth the effort for me to reload any of the new FC brass and have to scrap the brass after one reloading. I still have some old .223 FC small etched print brass that's great, loaded it 10+ times. Do what you want, check the primer pockets to see if the brass is any good. Lapua brass is not as soft as FC.