Also, how many times can you reuse brass casings(talking 9mm and 45acp)? Thanks guys.
'Til the case mouth splits.
How long that is depends how much you work (bell and crimp) the case mouths .....
Keeping away from max loads and using a gun that has a fully supported, properly sized chamber helps as well.
I have .45 ACP cases that have been fired, cleaned and reloaded so many times that the headstamp is getting hard to read .... until the case mouth cracks, I keep on usin' 'em.